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    Wyświetlanie 1-4 z 4
    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:
    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:
    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:
    Analysis of 50-year wind data of the Southern Baltic Sea for modelling coastal morphological evolution – a case study from the Darss-Zingst Peninsula
    Autorzy:
    Zhang, W.
    Harff, J.
    Schneider, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48896.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    coastal morphological evolution
    coastline change
    Darss-Zingst Peninsula
    modelling
    morphodynamic model
    sea level
    statistical analysis
    wind
    wind direction
    wind speed
    Opis:
    High-resolution wind series in the southern Baltic Sea for the period of 1958–2007 are analysed to generate representative climate input conditions for a multi-scale morphodynamic model to simulate decadal-to-centennial coastline change. Four seasonal wind classes, each characterized by a predominant distribution of wind direction and speed, are derived from statistical analysis. Further calibration of this statistical description is done by sensitivity studies of the model to generate similar coastline changes of the Darss-Zingst peninsula as the measured data for the last century. The coastline change of this area is then projected for the next 300 years based on four different climate scenarios, through which impacts of accelerated sea level rise and storm frequency on the long-term coastline change are quantified.
    Źródło:
    Oceanologia; 2011, 53, (1-TI)
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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