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Tytuł:
Assessment of Hazard from Damaging Wind Gusts in the Siedlce Area
Autorzy:
Radzka, Elżbieta
Olszewska, Eliza
Powiązania:
https://bibliotekanauki.pl/articles/2173241.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wind direction
wind speed
wind gust
hazard
Opis:
The average daily values of wind speed and wind gust speed in the years 2001–2018 in Siedlce were analyzed. In the study area, the frequency of individual wind directions was determined and, according to criteria set by the Government Centre for Security, the frequency of hazards from damaging wind gusts was evaluated. The following wind gusts were considered: >20 m/s, 25 m/s and 35 m/s. It was found that, in the Siedlce area, the prevailing wind direction was west-south-westerly (WSW), and the average annual wind speed in the long-term study period was 2.99 m/s. March, April and May were the months when the highest speeds of maximum wind gusts (>35 m/s) were recorded. Extreme wind gusts the speed of which poses a hazard to the environment, national economy as well as human life and health, occurred in both the cold and warm seasons of the year.
Źródło:
Journal of Ecological Engineering; 2022, 23, 7; 192--196
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trends Analysis of Wind in Srinagar Garhwal Valley, Uttarakhand, India
Autorzy:
Singh, Santosh
Negi, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/1075718.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
AWS
Srinagar Garhwal
Wind Direction
Wind Speed
Opis:
Wind results from the air in motion. Air in motion arises from a pressure gradient. Wind direction and wind speed are two characteristics of the wind, whose inter-relationships may give us an insight into the prevailing weather condition at a particular place. This study examines the trend analysis of the wind direction and wind speed pattern of Srinagar Garhwal Valley, Uttarakhand. The average wind speed in Srinagar Valley is 2.923± 1.232 m/s. As it is seen the most frequent wind in Srinagar Garhwal has a speed from 0.50 to 2.10 m/s in the northwest direction.
Źródło:
World Scientific News; 2019, 119; 248-253
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between the parameters of wind speed
Autorzy:
Halchak, V.
Syrotyuk, S.
Syrotyuk, V.
Powiązania:
https://bibliotekanauki.pl/articles/411281.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
wind
wind speed
distribution function
mean values
Opis:
This paper analyzes the methods of mapping the velocity of wind flow, and using them to measure the performance of wind turbines. The dependencies of the two-parameter Weibull distribution function on the scale parameter are analyzed. It should be noted that the parameters of the distribution function, and therefore the repeatability are probabilistic. The characteristics of Rayleigh distribution for different values of the scale are presented. The analytical-expressions and peculiar velocities of the integer and half-integer values for the shape parameters reflect the relationship between the mean, mean square, average-cubic, and estimated wind-speeds. It is shown that the ratio of the square of the average speed to the standard, regardless of the values of the shape-parameters and the scale-ratio can be replaced by the corresponding G-functions.The theoretical-calculation to design the medium-speed and its relation to the current and average speeds for the Weibull distribution with a half-integer values and the shape-parameter is presented. It is proved that the recommendation considers the speed of the medium design to be proportional to the mean, and permissible only if the distribution is close to normal. It has been established that the ratio between average wind velocities (in the case of Weilbull distribution parameter) are determined only by its form and the average velocity through the scale parameter. Weibull distribution allows to facilitate and simplify their calculation methodology so as to assess the energy parameters of wind turbines.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 4; 95-100
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An assessment the wind potential energy as a generator of electrical energy in the coastal area of southern Iraq
Autorzy:
Hadi, Firas A.
Abdulsada Al-Knani, Basim
Abdulwahab, Rawnak Adel
Powiązania:
https://bibliotekanauki.pl/articles/118705.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
wind energy
Basrah
wind speed analysis
wind potential
Opis:
Renewable energies have the potential to provide relatively clean energy, mostly for domestic energy. Wind power generation is expected to rise in the near future and has grown exponentially over the past decade in many countries. The most important parameter that must be taken into consideration when designing and studying wind power conversion systems is the wind speed. Probability density functions (PDF) such as Weibull is often used in wind speed and wind power analyses. This research presents an assessment of wind power based on the Weibull distribution statistics in the coastal of southern Iraq at Basrah province. Wind speed data for the study site were obtained from NASA at a height of 50 m for the period 1979–2016 with a time interval of 10 min. The data at a height of 50 m were extrapolated using the power law in order to estimate the wind speed at new heights: 30, 70 and 100 m. The different parameters of the Weibull function as well as the daily and monthly wind speeds, mean, variance and potential energy at four altitudes were estimated and analysed using Windographer software. Results indicate that the maximum wind speed at 100 m is 6.4 m·s–1, giving an average power density of 298 W·m–2, which indicates that the location of the study has marginal and useless potential for installing large wind turbines.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 1; 37-53
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind Power as a Renewable Energy Source
Autorzy:
Radzka, Elżbieta
Rymuza, Katarzyna
Michalak, Anna
Powiązania:
https://bibliotekanauki.pl/articles/124283.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
renewable energy sources
wind speed
wind direction
wind power technology
Opis:
The work presents a description of wind speed and direction in terms of using wind power as a renewable energy source. The wind power in Poland and at the Zawady EF was characterised. Observations were collected from 2002 to 2006 by an automatic meteorological station installed at the Zawady Experimental Farm (EF). Average monthly and yearly frequencies of winds blowing from individual directions were determined, and the average monthly wind speed was analysed. The most frequently recorded wind speed ranged from 2 to 4 m/s (light wind), and the least frequent winds blew at the speed of more than 10 m/s (strong wind). The cold season of the year saw winds blowing at the greatest speed (December, January and February), it being the lightest in the summer months (June, July and August). Wind rose analysis (2002–2006) revealed that at Zawady Experimental Farm, the westerly wind was the most frequent. A wind turbine has a limited capacity of wind power use, so only a small portion of energy supplied by wind may be converted into usable energy.
Źródło:
Journal of Ecological Engineering; 2019, 20, 3; 167-171
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of daily water temperature fluctuations in lake Kierskie (West Poland)
Autorzy:
Ptak, Mariusz
Sojka, Mariusz
Nowak, Bogumił
Powiązania:
https://bibliotekanauki.pl/articles/1051197.pdf
Data publikacji:
2019-09-30
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
lake
water temperature
air temperature
wind speed
Poznań
Opis:
The paper presents the dynamics of daily water temperature fluctuations in Lake Kierskie (West Poland) and determines the effect of air temperatures and wind speed on the variability of the parameter (water temperature). The analysis was based on hourly water temperature values from the period from May 2012 to January 2018. The data analysis permitted the description of the thermal regime of waters in the lake in the hourly cycle in reference to each month, and designation of months characterised by the highest and lowest stability of water temperatures. More than half of the analysed days was characterised by a change in water temperature not exceeding 1°C. The course of water temperature showed strongly positive correlations with air temperature, and weak correlations with wind speed. Water temperatures in the lake were correlated the strongest with air temperatures with a 24 h time step.
Źródło:
Quaestiones Geographicae; 2019, 38, 3; 41-49
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulating tropical storms in the Gulf of Mexico using analytical models
Autorzy:
Kalourazi, M.Y.
Siadatmousavi, S.M.
Yeganeh-Bakhtiary, A.
Jose, F.
Powiązania:
https://bibliotekanauki.pl/articles/2079278.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
wind speed
storm
wind velocity
hurricane
Mexico Gulf
analytical model
Opis:
Different analytical models have been evaluated for estimating wind speed of the tropical storm, where the storm-induced wind velocity is calculated as a function of distance from the center of the hurricane. For these models, different parameters such as maximum wind speed, a radius of the maximum wind, hurricane shape parameter, hurricane translation speed and the orientation of the trajectory, etc., affect the shape of a hurricane. Hurricanes Lili (2002), Ivan (2004), Katrina (2005), Gustav (2008) and Ike (2008) from the Gulf of Mexico were used for skill assessment. The maximum wind radius was calculated using significant wind radii (R34, R50 and R64) reported by the National Hurricane Center. Different formulas for calculating the radius of maximum wind speed were evaluated. The asymmetric wind field for each hurricane was generated using analytic methods and compared with in situ data from buoys in the Gulf of Mexico and the H*Wind data. Analytical models were able to predict high wind speed under tropical cyclone conditions with relatively high precision. Among the analytical models evaluated in this research, the model proposed by Holland et al. (2010) showed excellent results. Dynamical wind models such as NCEP/NARR provide wind speed with the coarse spatial resolution which is acceptable for far-field locations away from the hurricane eye. In contrast, analytical models were able to produce sufficiently reliable wind speed within a particular radius from the center of the hurricane. Therefore blending of dynamical and analytical models can be used to provide accurate wind data during hurricane passage in the Gulf of Mexico.
Źródło:
Oceanologia; 2020, 62, 2; 173-189
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of wind speed short term forecasts for wind farms
Porównanie modeli krótkookresowych prognoz prędkości wiatru dla siłowni wiatrowych
Autorzy:
Jaros, M.
Obidziński, P.
Powiązania:
https://bibliotekanauki.pl/articles/93819.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
forecasting
wind speed
wind farm
prognozowanie
prędkość wiatru
siłownia wiatrowa
Opis:
The purpose of study was verification regarding quality of wind speed forecasts used during designing the wind farm capacity, with AAN [artificial neural network] methods and Brown, Holt, Winters and ARIMA time models. Analysis included results of forecasts for December, namely a month with the biggest wind speed amplitude changes, considering data for period of 2008-2009. Analysis of results confirmed that appropriate linear models and artificial neural methods for the period of wind speed forecast may ensure good results regarding forecasts of wind power output generated by wind farms.
Celem pracy było sprawdzenie jakości prognozy prędkości wiatru, wykorzystywanej w planowaniu mocy siłowni wiatrowej, metodami SSN i modelami szeregów czasowych Browna, Holta, Wintersa i ARIMA. Porównano wyniki prognoz sporządzonych dla grudnia, miesiąca o największych zmianach amplitudy prędkości wiatru, sprawdzając je dla danych z lat 2008-2009. Analiza wyników wskazuje, że odpowiedni dobór modeli liniowych i sztucznych sieci neuronowych do horyzontu czasowego prognozy prędkości wiatru, może pozwolić na osiągnięcie dobrych wyników prognozowania energii, wytworzonej przez siłownie wiatrowe.
Źródło:
Agricultural Engineering; 2014, 18, 4; 81-90
2083-1587
Pojawia się w:
Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Analysis of Danger Zone Ranges Determined for LNG in the Coastal Area
Autorzy:
Kalbarczyk-Jedynak, A.
Stochła, D.
Patsch, M.
Powiązania:
https://bibliotekanauki.pl/articles/2064942.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
danger zone ranges
LNG
wind speed
Pasquill stability
Opis:
The analysis of danger zone ranges for LNG in the coastal area is an important task on account of, inter alia, the safety of human life. It is not an easy process, which is why we consider an danger situation for various weather conditions in the function of constant wind speeds and for various wind speeds in constant weather stability. Pasquill weather stability scale and Beaufort scale with regard to terrain roughness were adopted for the analysis. Both scenarios were considered in the example of Q-flex type vessels in the Świnoujście terminal for two methods of LNG release, i.e. related to a sudden explosion and slow release caused by a leak. The analysis was conducted and considered for the values in the top and bottom flammability limit. Modelling of the danger zone range was analysed with DNV PHAST software, version 7.11. In the process of comparison of the situation related to the risk of explosion in the function of various weather stabilities according to Pasquill scale and constant wind speeds, the values of 1.5 m/s and 5 m/s were adopted, corresponding to 1 and 3 wind force on the Beaufort scale. Those speeds correspond to the water conditions featuring tiny ripples and small waves, the crests of which start to break. The adopted weather stabilities analysed for wind speed equal to 1.5 m/s are A, B, D. A-type stability signifies the least stable atmospheric conditions, and D-type means neutral conditions. In turn, for the wind speed of 5 m/s B, D and F parameters in Pasquill scale were selected. Furthermore, ranges for variable wind speed values were analysed for the selected Pasquill stability.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 829--834
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany prędkości wiatru w rejonie Svalbardu w latach 1948-2008
Changes in surface wind speed in Svalbard area (1948-2008)
Autorzy:
Kruszewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/260657.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
Svalbard
analiza trendów
surface wind speed
trends analysis
Opis:
Praca charakteryzuje prędkości wiatru w oparciu o dane pochodzące z reanaliz NCEP/NCAR. Zmiany prędkości prześledzono w dwunastu punktach gridowych z rejonu Svalbardu. W przebiegu rocznym stwierdzono większe prędkości w miesiącach zimowych i mniejsze latem, przy czym amplituda tych zmian jest ponad dwukrotnie większa w południowej części rozpatrywanego obszaru. W przebiegach wieloletnich (1948-2008) obserwuje się istotny statystycznie wzrost rocznej prędkości wiatru w ośmiu gridach. W ostatnich trzy-dziestu latach wzrost ten przybierał na sile. Największe zmiany odnotowano w rejonie na północ od Svalbardu.
The aim of this work was to analyse the surface wind speed changeability in twelve grids points situated in the vicinity of Svalbard (Fig. 1) Gridded surface data from NCEP Reanalysis Derived data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA from their Web site at http://www. cdc.noaa.gov/ were used for statistical analysis over the period 1948–2008. The highest annual wind speed values (8.0 mźs–1) were noted in the south of area (75°N), the lowest in situated over land grid [80, 20] and in the northern part of area at 82.5°N (5.9-6.0 mźs–1). During the year maximum wind speed were noted in winter months, minimum in June or July in all grid points. The differences between winter and summer values are over two times higher at 75°N than in north (82.5°N) – see Tab. 1., Fig. 2. Maximum difference (3.9 mźs–1) was noted in [75, 10], minimum (1.6 mźs–1) in [82.5, 30] grid point. Differences in wind speed between selected grid points are bigger during winter and smaller in summer. Statistically significant positive trends in annual wind speed values were found in years 1948-2008 in whole area, except at 77.5°N and [80, 20] grid point.. The trend value is the greatest in [82.5, 10] grid (+0.017 mźs–1 per year) – see Tab. 3. At latitudes 75 and 80°N values of linear trend coefficients are lower (from +0.006 to +0.01 mźs–1 per year). In shorter 30-year periods continuous significant increase in wind speed is observed at 82.5°N from 60. to the present. The highest positive trend value was noted in [82.5, 10] grid over the 1978-2008 period (+0.032 mźs–1 per year). During the last 30 years significant positive trends in wind speed are present at latitude 80°N and in grid points [77.5, 20]; [77.5, 30].
Źródło:
Problemy Klimatologii Polarnej; 2009, 19; 159-168
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the air flow in selected buildings
Autorzy:
Bullová, I.
Powiązania:
https://bibliotekanauki.pl/articles/104898.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
air flow
aerodynamic coefficient
wind speed
air exchange rate
Opis:
Airflow properties are most apparent adjacent to the surface of the building, because there take place any reactions between liquid and solid object. Air exchange rate is associated with air flow through a building by natural - through small openings and cracks in the structure. Due to leakages in the building construction, opening and closing of windows, the air in the building shifts. The value of air exchange rate is hard to predict and depend of several variables - wind speed, difference between outside and inside temperatures, the quality of the building construction. The paper analyzed the air flow in selected buildings and quantified the value of air pressure differences and the air exchange rate with the emphasis on specification of aerodynamic coefficients.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 1; 161-166
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scenarios to reduce evaporation from class A evaporation pan by using windbreaks
Autorzy:
Oribi, Mustafa O.
Abdulkareem, Asraa K.
Powiązania:
https://bibliotekanauki.pl/articles/118708.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
evaporation basin
windbreaks natural
open water bodies
wind speed
Opis:
Evaporation from reservoirs and lakes is an important processes frequently occurring in dry, hot regions such as Iraq. In order to preserve the environment and to reduce the amount of evaporation from open water bodies in this study, simulation was performed to reduce evaporation from evaporation basin class A by using windbreaks natural (Conocarpus trees). Three basic scenarios were made that depended on the values of the atmospheric elements affecting the evaporation process in summer according to the modified Penman equation for the conditions of Iraq, the climate factors are temperature, solar radiation, wind speed, dew point, and the effect of the number of windbreaks and their height was also introduced in sub- scenario. Experiments have shown that the best sub-scenario for all basic scenarios is when the windbreaks are placed in a direct direction to the wind blowing on the evaporation basin in the form of three rows, each row contains three trees where the windbreaks are in case cross and the height of the trees is 100 cm and the distance between each tree and another, and between each row and row 15 × 15 cm, the results of this subscenario recorded the highest rate of evaporation reduction up to 35% of its original value before using windbreaks.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 3; 343-354
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Links between Variations in Climate Patterns and ITCZ Position over Nigeria
Autorzy:
Opeyemi, Rabiu Salau
Powiązania:
https://bibliotekanauki.pl/articles/1179010.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Climate
Flood
ITCZ
Rainfall
Solar Radiation
Temperature
Wind Speed
Opis:
The analysis of the observed 30 years data that include the monthly precipitation, wind speed and solar radiation from Maiduguri, Abuja, Ikeja and Port Harcourt is done to estimate the approximate shift in the Inter-Tropical Convergence Zone (ITCZ) mean position over Nigeria. The data are separated into three decades (1981-1990, 1991-2000 and 2001-2010) and their monthly mean values are compared with each other and with the corresponding magnitudes over the whole period (1981-2010). The results indicate that the overall precipitation increases southward across the country while the annual mean intensity rises over the decades in all the selected locations. Using the extreme decades, the magnitude of the rainfall in 2001-2010 is higher than the corresponding values in 1981-1990 by 20.84 mm, 9.87 mm, 18.40 mm and 6.89 mm in Maiduguri, Abuja, Ikeja (Lagos) and Port Harcourt respectively. Further investigation in all the locations showed periods of elevated monthly rainfall in the recent decades than other periods; the magnitudes compared to 1981-1990 are between 48.6mm-78.4mm which are much higher than the annual mean intensities while few months with very low rainfall are observed in Abuja and Port Harcourt. As expected, reverse pattern is seen in the wind speed which is generally lower in 2001-2010 than in 1981-1990. The rising magnitude of the precipitation over the decades imply that the ITCZ must have been shifting slightly over the periods to a more northern extreme in 2001-2010, causing northward spread of the rainfall which raises the overall intensity of the rainfall across Nigeria. A persistent northward shift in the ITCZ position with increasing magnitude of the associated rainfall could raise the current severity of soil erosion, frequency of flooding that might cause severe damages and paralyze businesses in Nigeria under such a future climate change. Hence, availability of data with advance technology for studying fluctuations in the ITCZ position might improve weather forecast that could favour farm yield and save lives and properties as climate changes in the future.
Źródło:
World Scientific News; 2017, 87; 191-204
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność kierunku i prędkości wiatru nad NW Spitsbergenem w okresie 1901–2010 z użyciem reanaliz ERA-20C
Variability of Wind Speed and Direction over the NW Spitsbergen in the Period 1901-2010 Using Era-20C Reanalises
Autorzy:
Strzyżewski, T.
Ulandowska-Monarcha, P.
Powiązania:
https://bibliotekanauki.pl/articles/163903.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwa Geofizyczne
Tematy:
reanalizy
prędkość wiatru
kierunek wiatru
Spitsbergen
reanalises
wind speed
wind directions
Svalbard
Opis:
Celem opracowania jest poznanie warunków anemologicznych w okresie 1901-2010 w rejonie północno-zachodniego Spitsbergenu. W tym celu posłużono się reanalizami ERA-20C. Uzyskane wyniki porównano z przebiegiem temperatury powietrza w tym rejonie. Nad obszarem NW Spitsbergenu przeważają kierunki wiatru NNE i NE (w sumie 21,9%). Najrzadziej występuje wiatr z kierunków zachodnich (W, WNW, NW, WSW, łącznie 9,7%). Można również zaobserwować, wyraźnie różniącą się strukturę częstości kierunków wiatru w porach roku. Średnia prędkość wiatru według reanaliz w latach 1901-2010 w przyjętym punkcie węzłowym wyniosła 5,6 ms-1. Prędkość wiatru w tym okresie wykazała znaczną zmienność z roku na rok. Stwierdzono przy tym istotny statystycznie (na poziomie 0,05) rosnący trend prędkości wiatru, wynoszący 0,5 ms-1 /100 lat.
The aim of the study was to know the wind conditions in the period 1901-2010 over the north-western Spitsbergen. For this purpose they are used ERA-20C reanalises. The results were compared with the course of air temperature in this region. Over the area of NW Spitsbergen predominate wind direction NNE and NE (total of 21.9%). The least frequent wind direction is from the west (W, WNW, NW, WSW, a total of 9.7%). Observed also differing structure of the frequency of wind direction, depending on the season. The average wind speed in the years 1901-2010 in the was 5.6 ms-1. Wind speed during this period showed considerable variability from year to year. It has been found that a statistically significant (at the 0.05 level) growing trend of wind speed (0.5 ms-1 /100 years).
Źródło:
Przegląd Geofizyczny; 2016, 1-2; 31-44
0033-2135
Pojawia się w:
Przegląd Geofizyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing the Impact of Wind Conditions on Urban Heat Islands in Large Australian Cities
Autorzy:
Al-Obaidi, Ilham
Rayburg, Scott
Półrolniczak, Marek
Neave, Melissa
Powiązania:
https://bibliotekanauki.pl/articles/2028031.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
climate change
heat island
wind speed
wind direction
seasonal UHI
diurnal UHI
Opis:
Urban regions are well known to be warmer than the outlying surrounding regions: this phenomenon is termed an Urban Heat Island (UHI). Depending upon its severity, an UHI can influence human health, the condition of urban vegetation, as well as air and water quality leading to a general decline in the living conditions of the affected urban environments and residents. Some studies have shown that prevailing weather conditions, like wind patterns, can influence UHI magnitudes. These studies suggest that wind speeds may be inversely related to UHI magnitude. However, long-term and high frequency weather and temperature measurements are exceedingly rare, so the exact nature of the relationship between wind speeds and directions as well as UHI magnitudes remain unknown. In order to address this problem, this study investigates how UHI magnitudes in five Australian cities affect wind speed and wind direction. The results of this study revealed that urban–non-urban temperature differences are most pronounced under calm weather conditions. The UHI intensity weakened as wind velocity increased: strong significant negative correlations were found between the mean UHI intensity and mean wind speed magnitudes. The results show that the greatest UHI intensities are recorded when wind is weak (less than $2 ms^{-1}$), while the lowest magnitudes are found when wind speeds exceed $6 ms^{-1}$. Further, the results show that the critical wind speed value, above which the strength of the UHI is considerably minimized, is around $4–5 ms^{-1}$. In addition, the study shows that wind direction in each city is a critical driver factor that determines the intensity of the UHI effect. When winds originate from dry environments, they favour high UHI intensities at all wind speeds, while the winds from the ocean side of coastal cities tend to cool urban regions, reducing UHI intensities or even promoting the urban cool island formation.
Źródło:
Journal of Ecological Engineering; 2021, 22, 11; 1-15
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indian Ocean wind speed variability and global teleconnection patterns
Autorzy:
Sinha, M.
Jha, S.
Chakraborty, P.
Powiązania:
https://bibliotekanauki.pl/articles/2079299.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
wind speed
variability
sea surface temperature
remote sensing
Indian Ocean
Opis:
The influence of the local sea surface temperature (SST) and remote ENSO (El Niño-Southern Oscillation) indices on the wind speed (WS) data were explored for the Indian Ocean region. Relationships among the parameters were studied using spatial correlation plots and significant correlation ranges. Two months (July and January) representing opposite monsoon phases were selected for analysis for the period 1950–2016. There was a significant negative correlation between WS and SST over the Bay of Bengal (BOB) during July. Although different ENSO indices correlated differently in different areas of the Indian Ocean, the region off the coast of Sri Lanka was most significantly teleconnected. The southwest monsoon locally impacted the WS and SST relationship and the WS parameter was remotely teleconnected in both the monsoon seasons. Further empirical orthogonal function (EOF) analysis was applied on the 67 years WS data of the BOB region to extract the dominant mode representing maximum variability of the total variance. The temporal pattern of the first principal component (PC1) of WS data was linked to the North Atlantic Oscillations in January and the Atlantic Multidecadal Oscillation in July respectively. The continuous wavelet power spectra of the PC1 of WS showed significant regions in the 2–4-year band resembling the ENSO variability. Wavelet coherence applied between PC1 of WS and the ENSO indices showed greatest values for January in the 8–16-year band and for July in the 0–4-year band. A close relationship was established between the WS variability in BOB and the ENSO indices.
Źródło:
Oceanologia; 2020, 62, 2; 126-138
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of meteorological factors on the radial growth of pine latewood in northern taiga
Autorzy:
Neverov, N.
Chistova, Z.
Mineev, A.
Powiązania:
https://bibliotekanauki.pl/articles/2106664.pdf
Data publikacji:
2022
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
late wood
pine
meteorological factor
air temperature
wind speed
taiga
Opis:
The purpose of this study is to evaluate the influence of day and night meteorological parameters (air temperatures and dew points, relative humidity, wind speed and precipitation) on the radial growth of pine latewood in northern taiga, in typical conditions of its growth. The study was conducted in the north of the Arkhangelsk region (Russia). A total of 63 cores were selected from seven most representative sites. Meteorological parameters were obtained from the WMR 918 H digital weather station (Huger GmbH, Germany), located directly on the study area and operating in monitoring mode. The analysis used meteorological data for the period 2008–2015. Correlation with night and day air temperature in June and July (0.72–0.77) was revealed in blueberry type. In all the stands studied, a reliable correlation with wind speed was established, direct (0.77‒0.88) and inverse (−0.7 to −0.99), but each sample plot had an individual dependence. A reliable correlation with the humidity of August and September (0.64–0.87) and an inverse correlation with precipitation in May and August (−0.63 to −0.75) were established. In general, pine in blueberry, cowberry and pine on swamp types have a similar reaction to the variability of meteorological factors, the most important of which is the temperature regime of air and wind speed.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 1; 7-14
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of wind turbine energy production models for rural applications
Porównanie modeli wytwarzania energii przez turbiny wiatrowe w zastosowaniach rolnicznych
Autorzy:
Kapica, J.
Powiązania:
https://bibliotekanauki.pl/articles/792976.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
wind turbine
wind energy
kinetic energy
energy production
rural application
wind speed
Weibull distribution
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 3
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Addendum to “Sea spray aerosol flux estimation based on long-term variation of wave statistics”: estimation based on long-term variation of wind statistics
Autorzy:
Myrhaug, D.
Wang, H.
Holmedal, L.E.
Powiązania:
https://bibliotekanauki.pl/articles/48948.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
sea spray
aerosol flux
wind speed
long-term variation
North Sea
Źródło:
Oceanologia; 2016, 58, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany składowej strefowej prędkości wiatru (U-wind) na wschód od Svalbardu (1981-2005)
The changes of zonal wind speed component (U-wind) east of Svalbard area (1981-2005)
Autorzy:
Kruszewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/260777.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
składowa strefowa prędkości wiatru (U-wind)
temperatura powietrza
Svalbard
zonal wind speed component (U-wind)
air temperature
Opis:
Praca charakteryzuje składową strefową prędkości wiatru w trzech gridach usytuowanych po wschodniej stronie Svalbardu oraz jej związki z temperaturą powietrza na stacjach zachodniego wybrzeża Spits-bergenu. W rejonie położonym na wschód od archipelagu obserwuje się dominację cyrkulacji wschodniej, której natężenie wyraźnie wzrasta przy przemieszczaniu się na południe. W przebiegu rocznym stwierdzono nasilanie się cyrkulacji wschodniej w miesiącach zimowych i osłabianie latem, przy czym zmienność wartości U-wind w mie-siącach chłodnej pory roku jest największa. Przewaga cyrkulacji zachodniej zaznacza się latem przez okres od jednego (na 75°N) do pięciu miesięcy (na 80°N), a jej natężenie rośnie wraz z szerokością geograficzną.
The study presents variability of zonal wind speed (U-wind) in three grids 2.5x2.5° situated in the vicinity of the eastern coast of Svalbard in period 1981–2005. Gridded surface data from NCEP Reanalysis Derived data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA from their Web site at http://www.cdc.noaa.gov/ were used for statistical analysis. In analysed area negative values of U-wind are typical. Annual average eastern air-flow is much stronger in the south (–1.54 m/s in grid [75, 30]) than in north (–0.31 m/s in grid [80, 30]) – see fig. 1 and 2. The biggest interannual changeability of U-wind values is also observed in lower latitudes. Significant decreasing trends were found in annual U-wind values in grid points [80, 30] (–0.05 m/s by year) and [77.5, 30] (–0.04 m/s by year). During the year eastern air-flow reach the maximum in winter months. In summer time easterly circulation is weaker. Positive U-wind values (western air-flow) prevails in July (grid [75, 30]); June, July and August (grid [77.5, 30]) and from May to September in grid [80, 30]. Intensity of western air-flow increase with latitude too. The biggest changeability in monthly U-wind values in all grid points was observed in February. Decreasing trends in monthly U-wind values were found in [80, 30] grid in February (–0.13 m/s by year) and in [77.5, 30] grid in March and May (–0.11 and –0.08 m/s by year). Correlations between U-wind and zonal westerly circulation index W values for Spitsbergen area (given by Niedźwiedź, 2006) are strong for all grids and seasons, but the strongest were noted in grid [75, 30] – linear correlation coefficient from r = +0.75 (winter) to r = +0.87 (summer) – see fig. 5. Some relations between U-wind and monthly air temperature in Svalbard-Lufthavn and Ny Alesund were noticed too (fig. 6). The strongest negative correlations were found in July, May and April.
Źródło:
Problemy Klimatologii Polarnej; 2007, 17; 77-85
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Warianty lokalizacji elektrowni wiatrowych w obszarze zurbanizowanym na podstawie pomiaru prędkości wiatru - badania wstępne
Localization of wind power plants in urban areas based on wind speed measurement - introduction
Autorzy:
Teleszewski, T.J.
Powiązania:
https://bibliotekanauki.pl/articles/2065509.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska
Tematy:
elektrownie wiatrowe
obszar miejski
histogram prędkości wiatru
wind turbines
urban area
wind speed histogram
Opis:
Przedstawiono warianty lokalizacji elektrowni wiatrowej na podstawie pomiarów prędkości powietrza w różnych częściach zabudowy miejskiej. Elektrownie wiatrowe najczęściej związane są z obszarem niezurbanizowanym ze względu na niewielką szorstkość terenu. W przypadku obszarów zurbanizowanych możliwość zastosowania elektrowni wiatrowych jest bardzo ograniczona z powodu znacznej szorstkości terenu. W przypadku terenu zabudowanego istnieje możliwość zastosowania tzw. małych miejskich elektrowni wiatrowych o osi pionowej, które mogą pracować przy stosunkowo małej prędkości powietrza. Lokalizacja elektrowni wiatrowych w obrębie budynków powinna być poprzedzona pomiarami prędkości wiatru. W pracy wykonano pomiary prędkości wiatru w różnych lokalizacjach na terenie Politechniki Białostockiej: na dachu budynku, przy ścianie budynku oraz między budynkami. Pomiary prędkości powietrza wykonano za pomocą zainstalowanych na stałe anemometrów.
This paper presents the variants of wind turbine location based on the measurements of air velocity in different parts of urban development. Wind-power plants are most often associated with non-urbanized areas due to the small rough terrain. In the case of urbanized areas, the possibility of using wind turbines is very limited due to the considerable rough terrain. In the case of built-up areas it is possible to use the so-called urban vertical wind turbines that can operate at relatively low air velocities. The location of the wind power plant within the building should be measured by the wind speed. Wind speed measurements were carried out at various locations in the Białystok Technical University on the roof of the building, on the wall of the building and between buildings. Measurements of air velocity were carried out using permanently installed anemometers.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2018, 7, 1; 83--88
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określenie granicznych prędkości wiatru dla bezpiecznego postoju kontenerowca ULCV na kotwicy
Determination of wind speed limits for safe anchoring of ULCV container ship
Autorzy:
Gil, M.
Wilczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/254145.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
prędkość wiatru
bezpieczeństwo
kontenerowiec
warunki hydrometeorologiczne
wind speed
security
container
hydrometeorological conditions
Opis:
W artykule omówiono wpływ warunków hydrometeorologicznych ze szczególnym uwzględnieniem działania wiatru oraz prądu na kontenerowiec ULCV (Ultra Large Container Vessel) podczas postoju na kotwicy. W celu wyznaczenia granicznych wartości wiatru, przeprowadzono badania symulacyjne z wykorzystaniem reprezentatywnego modelu statku, a otrzymane wyniki badań porównano z wykonanymi obliczeniami teoretycznymi.
Paper presents influence of hydro-meteorological conditions, especially wind and current on the ULCV (Ultra Large Container Vessel) container ship during anchoring. Wind speed limits, were determined by simulation study, based on representative ship model. Results of simulations were compared with theoretical calculations.
Źródło:
TTS Technika Transportu Szynowego; 2016, 12; 297-300
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of probability density function in modeling of wind speed on the Polish Batlic Coast
Autorzy:
Czernecki, B.
Powiązania:
https://bibliotekanauki.pl/articles/108544.pdf
Data publikacji:
2014
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
wind speed
Weibull distribution
canonical correlation analysis
statistical downscaling
Polish Baltic Coast
Opis:
The aim of the research was to identify the potential for the use of probability density functions (PDF) in modeling of near-surface wind speed. The approaches of Empirical Orthogonal Functions (EOF) and Canonical Correlation Analysis (CCA) are used in combination with 2-parametric Weibull distribution. The downscaling model was built using a diagnosed relationship between sea level pressure (SLP) patterns over Europe and the Northern Atlantic and estimated monthly values of Weibull parameters at 9 stations along the Polish Baltic Coast. The obtained scale (A) and shape (k) parameters make it possible to describe temporal variations of wind fields and their theoretical probability values. This may have further application in the modeling of extreme wind speeds for seasonal forecasting, climate prediction or in historical reconstructions. The model evaluation was done separately for the calibration (1971-2000) and validation periods (2001-2010). The scale parameter was reconstructed reasonably, while there were some problematic issues with the shape parameter, especially in the validation period. The quality of the developed models is generally higher for the winter season, due to larger SLP gradients, whereas the results for the spring and summer seasons were less satisfactory. Despite this, the 99th percentile of theoretical wind speeds are in most cases satisfactory, due to the lesser importance of the shape parameter for typical distributions in the analyzed region.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2014, 2, 2; 23-33
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between atmospheric positive electric charge densities and gas bubble concentrations in the Baltic Sea
Autorzy:
Klusek, Z.
Wiszniewski, A.
Jakacki, J.
Powiązania:
https://bibliotekanauki.pl/articles/48266.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
wind speed
gas bubble
concentration
atmospheric electricity
Baltic Sea
air ion
brackish water
Opis:
Simultaneous measurements of bubble density in the sea subsurface and positive ions in the lower atmosphere were performed in the Baltic Sea in the summer of 1999. Bubbles in two size ranges, around 27 and 100 μm, were measured acoustically. Airborne positive charge was measured with a Gerdien instrument. Observed concentrations of air ions varied from 60 cm−3 up to 600 cm−3. The relative role of bubbles and wind speed on the positive air ion concentrations over the brackish water of the Baltic Sea is discussed. The parameters of a model of a log-log dependence between charge concentration and bubble density are calculated. The correlation functions between time series of concentrations of positive charges over the sea and gas bubbles averaged over a depth range from 0.4 to 4 m and wind speed are presented. There was zero lag between the cross-correlation maxima of charge and bubbles, but there was a phase lag of one and a half hours between charge and wind speed.
Źródło:
Oceanologia; 2004, 46, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
WAVEWATCH-III source terms evaluation for optimizing hurricane wave modeling: A case study of Hurricane Ivan
Autorzy:
Kalourazi, M.Y.
Siadatmousavi, S.M.
Yeganeh-Bakhtiary, A.
Jose, F.
Powiązania:
https://bibliotekanauki.pl/articles/2078933.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
sea wave modelling
Hurricane Ivan
wind speed
wave parameter
whitecap dissipation
Mexico Gulf
Opis:
Simulating hurricane-generated waves is a challenging task due to rapidly fluctuating wind speed and direction, simultaneous presence of swells propagating out of the previous location of the hurricane and following/opposing waves on either side of the hurricane track, and dissipation in wind speed radially from the center of the hurricane. Bulk wave parameters have been investigated using the source term packages ST3, ST4 and ST6 implemented in the WAVEWATCH-III model to determine the most appropriate formulation for simulating hurricanegenerated waves in the Gulf of Mexico. Based on the comparisons between model results and in situ observations during the passage of Hurricane Ivan (2004), it is shown that ST3 is not as successful as other formulations for hurricane wave modeling. Calibrated ST6 variant, T12, has shown to be the best formulation for simulating bulk wave parameters at points within the range of hurricane wind forcing; however, for the area beyond, and also during fair weather conditions, calibrated ST4 formulation, T471-Ex4, is recommended. Although T471-EX4 and T12 packages outperformed other cases, they overestimated waves propagating in the oblique and opposing wind. Dependence of ST6 parameter a0 on wind and wave direction is examined to improve the model performance.
Źródło:
Oceanologia; 2021, 63, 2; 194-213
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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