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Tytuł:
On the possibility of forecasting water level on the basis of the HIROMB model
Autorzy:
Kałas, M.
Szefler, K.
Powiązania:
https://bibliotekanauki.pl/articles/1920495.pdf
Data publikacji:
1999
Wydawca:
Instytut Morski w Gdańsku
Tematy:
water level
HIROMB model
Opis:
The following paper presents a comparison of water Level data taken during the POLRODEX'97 experiment by some Polish water Level gauges situated around the Gulf of Gdansk with results computed for this period using the High Resolution Operational Model for the Baltic Sea (HIROMB ). Additionally sea level changes near the oil-drilling platform BETA were computed using data from pressure sensors and compared with results of the model. It is found that observed and computed values of sea level change are in good agreement.
Źródło:
Biuletyn Instytutu Morskiego w Gdańsku; 1999, 26, 1; 39-45
1230-7424
2450-5536
Pojawia się w:
Biuletyn Instytutu Morskiego w Gdańsku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water level forecasts for the eastern Gulf of Finland
Autorzy:
Klevanny, K. A.
Gubareva, V. P.
Mostamandy, M. S. W.
Ozerova, L. B.
Powiązania:
https://bibliotekanauki.pl/articles/972855.pdf
Data publikacji:
2001
Wydawca:
Instytut Morski w Gdańsku
Tematy:
water level
forecasts
Gulf of Finland
Opis:
The paper presents results of development and verification of the automated water level forecasting system for the eastern part of the Gulf of Finland with advance time 36 hours, which is based on two-dimensional hydrodynamic model of the Baltic Sea BSM3. The model is driven by the regional highresolution atmospheric model HIRLAM. Boundary conditions in the Danish Straits are received from a big scale model of the Baltic and North Seas (OPMODEL). The system works at the North-West Regional Administration of Hydro-Meteorological Service of Russia (NWHMS).
Źródło:
Biuletyn Instytutu Morskiego w Gdańsku; 2001, 28, 2; 71-87
1230-7424
2450-5536
Pojawia się w:
Biuletyn Instytutu Morskiego w Gdańsku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water level forecasts for the eastern Gulf of Finland
Autorzy:
Klevanny, K. A.
Gubareva, V. P.
Mostamandy, M. S. W.
Ozerova, L. B.
Powiązania:
https://bibliotekanauki.pl/articles/1920573.pdf
Data publikacji:
2000
Wydawca:
Instytut Morski w Gdańsku
Tematy:
water level
forecasts
Gulf of Finland
Opis:
The paper presents results of development and verification of the automated water level forecasting system for the eastern part of the Gulf of Finland with advance time 36 hours, which is based on two-dimensional hydrodynamic model of the Baltic Sea BSM3. The model is driven by the regional highresolution atmospheric model HIRLAM. Boundary conditions in the Danish Straits are received from a big scale model of the Baltic and North Seas (OPMODEL). The system works at the North-West Regional Administration of Hydro-Meteorological Service of Russia (NWHMS).
Źródło:
Biuletyn Instytutu Morskiego w Gdańsku; 2001, 28, 2; 71-87
1230-7424
2450-5536
Pojawia się w:
Biuletyn Instytutu Morskiego w Gdańsku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the change of river channel geometry on the size and range of backwater from the receiving body
Autorzy:
Mokrzycka, A.
Powiązania:
https://bibliotekanauki.pl/articles/360781.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
backwater
backwater range
river water level rise
depth
Opis:
This study is an analysis of the possibility of harnessing backwater in open river channels to create waterways in the area of the river mouth. To accomplish this, simplified methods of analysing non-uniform flow have been assessed, with the use of Rühlmann’s, Tolkmitt’s and Bresse’s equations. It was demonstrated that Bresse’s method is the best of the three – the results obtained by using it to determine the range of backwater from the receiving body are much closer to true values than for the other two, and it is the only method that meets the physical criterion of backwater size with the boundary condition of Chezy depth tending to 0. The carried out analyses demonstrated that it is possible to create high-class waterways in lower reaches of rivers by modifying the geometry of their channels, namely the depth and slope of their bottom.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 33 (105); 69-74
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dredging Volumes Prediction for the Access Channel of Santos Port Considering Different Design Depths
Autorzy:
Pion, L.M.
Bernardino, J.C.M
Powiązania:
https://bibliotekanauki.pl/articles/116091.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Port of Santos
dredging
water level
dredging volumes prediction
Chart Datum (CD)
water level modeling
access channel
prediction method
Opis:
Santos is the most important Brazilian port, handling about 114 million of tons in 2016. In 2010, there was a great capital dredging in order to deepen the Access Channel to 15m deep (Chart Datum - CD). This depth was not achieved, due to inefficiency on dredging procedures. As deepening and maintaining design depths are indispensable, this study presents an analysis of sediment deposition in Santos Port Access Channel and an annual dredging volumes prediction, considering current bathymetric survey and design depths of 15, 16 and 17 m (CD).A numerical hydrodynamic and morphological model was developed for the interest area, by using Delft3D®, calibrated with waves, currents and water level data measured within Santos Port adjacen-cies. Sediment transport model was calibrated with suspended sediment data and historic series of dredged volumes from Santos Port Access Channel. Two different scenarios were simulated for each design depth, according to the regional environmental characteristics. For current bathymetric scenario, the model estimates that it would be necessary to dredge an annual average of about 4,325,000 m³ from Santos Port access chan-nel to maintain current depth condition. Regarding design depths of 15, 16, 17 meters, it would be an in-crease of 15%, 55%, and 80%.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 505-514
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testate Amoebae as Proxy for Water Level Changes in a Brackish Tidal Marsh
Autorzy:
Ooms, Marijke
Beyens, Louis
Temmerman, Stijn
Powiązania:
https://bibliotekanauki.pl/articles/763455.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Testate amoebae, elevation, sea-level change, water-level change, estuary
Opis:
Few studies have examined testate amoebae assemblages of estuarine tidal marshes. This study investigates the possibility of using soil testate amoebae assemblages of a brackish tidal marsh (Scheldt estuary, Belgium) as a proxy for water level changes. On the marsh surface an elevation gradient is sampled to be analyzed for testate amoebae assemblages and sediment characteristics. Further, vegetation, flooding frequency and soil conductivity have been taken into account to explain the testate amoebae species variation. The data reveal that testate amoebae are not able to establish assemblages at the brackish tidal marsh part with flooding frequencies equal to or higher than 36.5%. Further, two separate testate amoebae zones are distinguished based on cluster analysis. The lower zone’s testate amoebae species composition is influenced by the flooding frequency (~ elevation) and particle size, while the species variability in the higher zone is related to the organic content of the soil and particle size. These observations suggest that the ecological meaning of elevation shifts over its range on the brackish tidal marsh Testate amoeba assemblages in such a brackish habitat show thus a vertical zonation (RMSEP: 0.19 m) that is comparable to the vertical zonation of testate amoebae and other protists on freshwater tidal marshes and salt marshes.
Źródło:
Acta Protozoologica; 2012, 51, 3
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The efficiency of some forecasting methods applied to annual minimum flow series
Autorzy:
Weglarczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/61400.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
forecasting method
Holt-Winters model
water level
annual minimum water level
Vistula River
tributary
local linear regression model
river
LOESS model
Opis:
Four methods of forecasting: „no-change", LOESS, local linear regression and Holt-Winters were applied to annual minimum water levels observed at ten cross-sections of two tributaries of the Vistula river. The 1-, 2-, ..., 5-year forecasts were made for each year after some initial year, and four quality measures: bias, root mean square error, mean absolute error and maximum absolute error were calculated for each time series and lead time. The naïve model turned out to be always the worst in it bias and almost always very good, sometimes the best regarding the other measures.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2011, 12
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A data-driven approach to predict hydrometeorological variability and fluctuations in lake water levels
Autorzy:
Tan Kesgin, Remziye I.
Demir, Ibrahim
Kesgin, Erdal
Abdelkader, Mohamed
Agaccioglu, Hayrullah
Powiązania:
https://bibliotekanauki.pl/articles/28411608.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
evaporation
lake water level
precipitation
stochastic time series models
water transfer
Opis:
Beyşehir Lake is the largest freshwater lake in the Mediterranean region of Turkey that is used for drinking and irrigation purposes. The aim of this paper is to examine the potential for data-driven methods to predict long-term lake levels. The surface water level variability was forecast using conventional machine learning models, including autoregressive moving average (ARMA), autoregressive integrated moving average (ARIMA), and seasonal autoregressive integrated moving average (SARIMA). Based on the monthly water levels of Beyşehir Lake from 1992 to 2016, future water levels were predicted up to 24 months in advance. Water level predictions were obtained using conventional time series stochastic models, including autoregressive moving average, autoregressive integrated moving average, and seasonal autoregressive integrated moving average. Using historical records from the same period, prediction models for precipitation and evaporation were also developed. In order to assess the model’s accuracy, statistical performance metrics were applied. The results indicated that the seasonal autoregressive integrated moving average model outperformed all other models for lake level, precipitation, and evaporation prediction. The obtained results suggested the importance of incorporating the seasonality component for climate predictions in the region. The findings of this study demonstrated that simple stochastic models are effective in predicting the temporal evolution of hydrometeorological variables and fluctuations in lake water levels.
Źródło:
Journal of Water and Land Development; 2023, 58; 158--170
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on drum water level control of marine auxiliary boiler based on ADRC
Autorzy:
Gan, H.
Lv, B.
Powiązania:
https://bibliotekanauki.pl/articles/258530.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ADRC
robustness
adaptability
drum water level
marine auxiliary boiler
Opis:
SThe active disturbance rejection control (ADRC) exhibits strong robustness and adaptability in the presence of strong interference of a large class of uncertain systems. In order to better control the water level of the auxiliary boiler drum, this paper applies the ADRC to improve its control precision, robustness and timeliness. Firstly, the change of drum water level in a large oil tanker auxiliary boiler is analyzed and the dynamic equation is established. After the mathematic changes, the dynamic equation is transformed into a two-order system. Aiming at the characteristics of nonlinear, time-varying and strong disturbance of the boiler water level control system in marine auxiliary boiler, studying the ADRC that includes tracking differentiator (TD), extended state observer (ESO), nonlinear feedback (NLSEF) and disturbance compensation of four parts. The establishment of two kinds of two-order ADRC controller to control the drum level. Through the theoretical analysis and simulation experiment test, and comparing with the cascade control strategy, the experimental results show that the active disturbance rejection controller satisfies the steady state response index of the system, and has good timeliness and accuracy to the control of water level of the drum.
Źródło:
Polish Maritime Research; 2018, S 2; 35-41
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Last two millennia water level changes of the Młynek Lake (northern Poland) inferred from diatoms and chrysophyte cysts record
Autorzy:
Zalat, Abdelfattah
Welc, Fabian
Nitychoruk, Jerzy
Marks, Leszek
Chodyka, Marta
Zbucki, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2025243.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Diatoms
chrysophyte
environment
water level
climate change
Młynek Lake
Polska
Opis:
A sediment core, 350 cm long recovered from Młynek Lake, northern of Poland (Warmia and Masuria Region) was analyzed with respect to their content of diatoms and chrysophyte cysts. The aim was to reconstruct the lake water level and climatic changes during the past 2500 years. The recognized diatom assemblages displayed marked floristic changes along the sediment core samples. The main change in diatom composition consists of a shift from an assemblage dominated by benthic Fragilaria sensu lato species through marked intervals to a planktonic one in distinct zones. A high proportion of benthic to plankton taxa has been reported as indicative for a lowering of the lake level with long ice cover in a cold dry climate and a shift from benthic to planktonic diatom taxa reflects arising water level with longest growing season and reduced ice cover on the lake during a warm wet climate. Multivariate statistical analysis included hierarchical ascending clustering distinguished four diatom ecological groups. The analyzed core section was divided into 11 diatom zones according to a distribution of ecological groups and variation in abundance of dominant species supported by 14C data. The results displayed a developmental history of the Młynek Lake that can be divided into 6 main phases of alternating warm wet and cold dry shifts. A distinct dominance of planktonic eutrophic indicator diatoms accompanied by a low abundance of chrysophyte cysts indicates increased lake trophicity and a general trend for the increasing anthropogenic impact.
Źródło:
Studia Quaternaria; 2018, 35; 77-89
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water relations during two hydrological years in swampy areas in the Siemianice Forest Experimental Station
Autorzy:
Krysztofiak, A.T.
Miler, A.T.
Powiązania:
https://bibliotekanauki.pl/articles/62494.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
water relation
hydrology
swamp area
Siemianice Forest Experimental Station
forest experimental station
ground water level
surface water level
climate change
Marianka Forest District
forest environment
water resource
water condition
Opis:
In recent years researchers have focused increasingly on climatic changes taking place in nature (increasing air temperature, decreasing precipitation totals). These imply changes in components of water balances and in practice changes in water relations both on the global and local scale. At present site overdrying is considered to be the biggest threat [Pierzgalski 2007]. The aim of the study is to present water relations in the forest swampy areas in a forest district (the Marianka Forest District) of the Siemianice Forest Experimental Station in hydrological years of 2005 and 2006. The investigations showed that analysed catchments, despite being located in swampy areas, are characterized by periods of water depletion in ditches. In analysed watercourses runoff was recorded from mid-November 2004 to the beginning of June 2005, while in the next hydrological year it was recorded again from mid-November, but this time longer to mid-June 2006. In relation to ground water of the catchment area a predictable relationship was observed of the water table level at the locations of observation wells. The wells located in the top sections of the catchment had water table the deepest below the ground level, while wells in valleys had water tables at the most shallow levels. It may also be stated that wells situated in higher areas (watershed), are characterized by a slightly bigger variation in the ground water table during the year than it was the case with wells located at lower points (in valleys). Both analyzed hydrological years (2005 and 2006) showed a similar pattern of ground water table at individual sites. Moreover, a marked cyclicity was recorded in the elevation of the water table, i.e. water level rising in autumn and lowering in summer months (as a result of changes in plant transpiration). The relationship of ground water levels with different forest sites found in the analyzed catchments confirms the dependence on the site moisture level variant. Water was lying at the most shallow levels in the ash-alder swamp forest site – a marshy site, while it was markedly the deepest in fresh mixed coniferous forest sites – a fresh site type. When analyzing changes in the ground water levels in terms of stand age classes we may clearly observe the seasonal variation and similar patterns of changes. Water lay the most shallow in stands of age classes V and VI. The level was significantly deepest in age class IV. The above dependencies pertained both to the hydrological year 2005 and 2006.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2008, 06
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of runoff prediction on grey water footprint in a small agricultural catchment
Autorzy:
Hejduk, Leszek
Hejduk, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/108592.pdf
Data publikacji:
2019
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
grey water footprint
water pollution level
catchment
Opis:
According to Hoekstra et al. (2011) the water footprint within a geographic area is defined as the total freshwater consumption and pollution within the boundaries of the area. The grey part of the water footprint refers to pollution and is an indicator of the water volume needed to assimilate a pollutant load that reaches a water body. It is possible then, based on the grey water footprint to estimate if the water available in a river at a particular crosssection will be sufficient to maintain a water pollution level (WPL) below 100%. The crossing of 100% indicates that the waste assimilation capacity has been fully consumed in this particular catchment. In this paper, the grey water footprint from nonpoint source pollution has been calculated based on long-term hydrometrological data for the upper part of a small agricultural catchment (area of 23.4 km2 ) (Zagożdżonka River) in central Poland. Based on land use and the amount of fertilizers applied in the catchment, together with information about the natural concentration of nitrogen and phosphorus in the river, as well as maximum acceptable concentration, the water pollution level has been calculated for actual conditions. The estimation of future runoff decreases for the considered catchment (Banasik, Hejduk 2012) has been applied in order to estimate potential future water pollution levels. The calculation shows that, even when the management practices in this catchment remain as they are, including the current extensive crop production, the WPL of 100% will be exceeded in the year 2033 (for phosphorus) and 2043 (for nitrogen) due only to the decreasing availability of water.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2019, 7, 1; 41-46
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The short-term changes of gully erosion forms in the context of the water level fluctuations in the Bratsk reservoir (Russia)
Autorzy:
Mazaeva, O.
Kaczmarek, H.
Khak, V. A.
Kozyreva, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/294685.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
gully erosion
short-term dynamic
abrasion
reservoir
water level fluctuation
Opis:
The results of investigations ascertain the influence of the water level regime on the erosion dynamics that was estimated according gullies volume change within the space-time between two measurements. The development of gullies in the shore zone is to a large extent influenced by the abrasion of shore slopes, which is intense at high water level in the reservoir. The minimum rate of gully development (4.5-54.7m3 yr-1) was due to the action of shore abrasion and eolian processes within the period of 2004-2007. A large positive dynamics can be attributed to the increasing number of erosion cuts. The maximum material loss from gullies (in total 627.66 m3 ) and the average volumetric retreat rate for all gullies (16.5 m3 yr-1) were recorded at the permanent lowering of the reservoir water level during the 2007-2008 period. Water level fluctuations cause cyclic changes in the dynamics of processes and initiate the new mechanism of erosion that is not typical of regular conditions.
Źródło:
Landform Analysis; 2011, 17; 117-123
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena ryzyka zagrożenia powodziowego na rzece Nysa Kłodzka z wykorzystaniem wybranych rozkładów prawdopodobieństwa wartości ekstremalnych
Assessment of flood risk on the Nysa Klodzka River using selected extreme values distributions
Autorzy:
Kuźmiński, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/424955.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
flood risk
one-yaer maximum
water level
Gumbel distribution
Frechet distribution
Opis:
The article concerns the application of selected distributions of extreme values to estimate the risk of occurring of flood danger in Lower Silesia. In the study a daily water level on the Nysa Klodzka River was used, that was gathered in the hydrological station in Bystrzyca Klodzka. From the collected data from the period 1981-2013 biannual maximum water level was selected. Two theoretical distributions: Gumbel and Frechet were fitted to the empirical distribution of biannual maximal. The best fitted two distributions were used for the exemplary assessment of flood danger.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 1 (51); 48-60
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Above - water accumulative forms within the shore zone of the reservoir showing significant seasonal water level fluctuations based on the Pakoski reservoir
Autorzy:
Grobelska, H.
Powiązania:
https://bibliotekanauki.pl/articles/294412.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
artificial water reservoir
water level fluctuations
accumulation
accumulative form
morphogenetic classification of forms
Opis:
The Pakoski reservoir .was created in 1975 as a result of damming the lakes located within the Western Valley of the Noteć River. This reservoir operates in rearly cycles with water level fluctuations of up to 3.6 m. The researches carried off by the author in the years 1998-2003 indicate that the thirty-year exploitation period has not ended the intense reshaping phase of the shore zone of the reservoir. Both intensive shore abrasion and various accumulative forms support the above statement. These forms include the small ones of distinctively initial character, such as accumulative spurs or berms, as well as the complex ones whose shaping process has almost finished and the area of which exceeds a few hundred square metres. Due to constant lowering of the water level, accumulative forms occur within the entire width of the shore-platform which is being dried. In most cases these are whole groups of smaller forms related to one another. A beach can constitute a good example, as it predominantly combines a few, most often 5 to 6, adjoining beach ridges separated with small lagoons.
Źródło:
Landform Analysis; 2008, 6; 28-40
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
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