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Calibration of HEC-RAS Model for One Dimensional Steady Flow Analysis—A Case of Senegal River Estuary Downstream Diama Dam

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Open Journal of Modern Hydrology 2020年第3期10卷 45-64页

作者： Raymond Diedhiou Soussou Sambou Seidou Kane Issa Leye Samo Diatta Mousse Landing Sane didier maria ndione Hydraulic and Fluids Mechanics Laboratory (HFML) Department of Physics Faculty of Sciences and Technology Cheikh Anta Diop University (UCAD) Dakar-Fann Senegal Polytechnic High School of Thies Thies Senegal

The Sahelian regions have experienced a drought that has made them vulnerable to hydro-climatic conditions. Strategies have been developed to reduce this vulnerability. The governments of Senegal, Mauritania, Mali and Guinea have created the Organization for the development of the Senegal River (OMVS in french) with the aim of realizing large hydraulic installations. This resulted in the construction of the Diama and Manantali dams in the Senegal River Basin. The first aims to stop the saline intrusion, the second to regulate the flow of the river, to allow the irrigation of agricultural perimeters, and to produce electrical energy. The impoundment of the Diama dam has modified the hydraulic behavior of the estuary. The purpose of this study is to carry out the hydraulic modeling of the estuary of Senegal river downstream of the Diama Dam in transient mode by the HEC-RAS software. Two geometric models were constructed on the basis of a digital terrain model (DTM) using the Arc-GIS and HEC GeoRAS soft wares after processing the collected topographic data. The first geometric model, of which the areas of Senegal river downstream Diama Dam have been represented by cross-section, is one-dimensional. The second one is also one dimensional;in this model, the area of the Senegal River estuary downstream Diama Dam is introduced as water storage zones. The components of these models are the stream sections, lateral links, and storage areas. The flood hydrograph downstream Diama Dam is introduced as conditions at the upstream limits of the models while the tidal is introduced as a downstream condition. After the stability and calibration, the results given by HEC-RAS simulations are the variations of the water levels, the tempor

关键词： Diama Dam Estuary Flood HEC-RAS Senegal River

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Statistical Analysis for Assessing Randomness, Shift and Trend in Rainfall Time Series under Climate Variability and Change: Case of Senegal

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Journal of Geoscience and Environment Protection 2017年第13期5卷 31-53页

作者： didier maria ndione Soussou Sambou Moussé Landing Sane Seydou Kane Issa Leye Seni Tamba Mouhamed Talla Cisse Hydraulic and Fluids Mechanics Laboratory (HFML) Department of Physics Faculty of Sciences and technology Cheikh Anta Diop University (UCAD) Dakar Senegal Polytechnic High School of Thies Thies Senegal

The main purpose of this study is to assess the climate variability and change through statistical processing tools that able to highlight annual and monthly rainfall behavior between 1970 and 2010 in six strategical raingauges located in northern (Saint-Louis, Bakel), central (Dakar, Kaolack), and southern (Ziguinchor, Tambacounda) part of Senegal. Further, differences in sensitivity of statistical tests are also exhibited by applying several tests rather than a single one to check for one behavior. Dependency of results from statistical tests on studied sequence in time series is also shown comparing results of tests applied on two different periods (1970-2010 and 1960-2010). Therefore, between 1970 and 2010, exploratory data analysis is made to give in a visible manner a first idea on rainfall behavior. Then, Statistical characteristics such as the mean, variance, standard deviation, coefficient of variation, skewness and kurtosis are calculated. Subsequently, statistical tests are applied to all retained time series. Kendall and Spearman rank correlation tests allow verifying whether or not annual rainfall observations are independent. Hubert’s procedures of segmentation, Pettitt, Lee Heghinian and Buishand tests allow checking rainfall homogeneity. Trend is undertaken by first employing the annual and seasonal Mann-Kendall trend test, and in case of significance, magnitude of trend is calculated by Sen’s slope estimator tests. All statistical tests are applied in the period of 1960-2010. Explanatory analysis data indicates upwards trends for records in northern and central and trend free for southern records. Application of multiple tests shows that the Kendall and spearman ranks correlation tests lead to same conclusion. The difference in tests sensitivity was shown by outcomes of homogeneity tests giving different results either in dates of the shift occurrence or in the significance of an eventual shift. A synthesis analysis of results of tests was carried o

关键词： Senegal Rainfall Time Series Test Independence Homogeneity Shift Trend

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Modeling of Unsteady Flow through Junction in Rectangular Channels: Impact of Model Junction in the Downstream Channel Hydrograph

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Computational Water, Energy, and Environmental Engineering 2017年第3期6卷 304-319页

作者： Seidou Kane Soussou Sambou Issa Leye Raymond Diedhiou Seni Tamba Mouhamed Talla Cisse didier maria ndione Mousse Landing Sane Faculty of Sciences and Technics Department of Physics Cheikh Anta Diop University Dakar Senegal Polytechnic High School of Thies Thies Senegal

Open channel junctions are encountered in urban water treatment plants, irrigation and drainage canals, and natural river systems. Junctions are very important in municipal sewerage systems and river engineering. Adequate theoretical description of flow through an open channel junction is difficult because numerous variables are to be considered. Equations of junction models are based on mass and momentum or mass and energy conservation. The objective of this study is to compare two junction models for subcritical flows. In channel branches, we solve numerically the Saint-Venant hyperbolic system by combining Preissmann scheme and double sweep method. We validate our results with HEC-RAS using Nash and Sutcliffe efficiency. In junction models, equality of water stage and complete energy conservation equation from HEC-RAS are compared. Outcome of the research clearly indicates that the complete conservation energy model is more suitable in flow through junction than equality of water stage model in serious situations.

关键词： Junction Model HEC RAS Saint-Venant’s Equations Double Sweep Method Equality of Water Stages Energy Conservation Modelling of Flow

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Simulation of Flood Propagation from the Niandouba Dam Outlet(Kayanga River,Senegal)to the Waïma Lake Inlet Using HEC RAS for Water Resource Management in the AnambéIrrigated Perimeters

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Journal of Environmental Science and Engineering(A) 2021年第5期10卷 157-173页

作者： Issa Lèye Seïdou Kane MousséLanding Sane didier maria ndione Ibrahima Ndiaye Raymond Diédhiou Soussou Sambou Hydraulic and Fluids Mechanics Laboratory(HFML) Department of PhysicsFaculty of Sciences and TechnologyCheikh Anta Diop University(UCAD)Dakar-Fann 5005Senegal

Dams are designed for water storage intended to compensate downstream fluctuations that are stabilizing water supply and hydropower *** modelling tools and schemes allow understanding the hydraulic characteristics of the irrigation systems and mitigating uncertainty inherent to dam *** construction of the Niandouba dam at the confluence of the Kayanga and Anambérivers(Senegal)has perturbed the natural flow of the AnambéRiver to feed the Waïma Lake and irrigated *** flow gauges at the Kayanga and AnambéRivers are no longer *** this study,the HEC-RAS(Hydrological Engineering Centre River Analysis System)and the RAS Mapper is used to simulate the flow propagation of the Kayanga-Anambéhydraulic system ranging from the Niandouba dam to the entry of Waïma *** HEC-RAS modelling enables the estimating of,among other variables,water levels,depths and flow velocities for the different flow configurations and different cross-sectional *** study presents a flood mapping of the Kayanga-Anambéhydro system using the RAS Mapper and HEC-RAS hydraulic modelling *** study has exhibited the depths at the inlet of the supply channels where the pumping stations are located.

关键词： HEC-RAS RAS Mapper hydraulic models irrigation Kayanga/Anambé dams

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Calibration and Validation of the SWAT Model on the Watershed of Bafing River, Main Upstream Tributary of Senegal River: Checking for the Influence of the Period of Study

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Open Journal of Modern Hydrology 2020年第4期10卷 81-104页

作者： Moussé Landing Sane Soussou Sambou Issa Leye didier maria ndione Samo Diatta Ibrahima Ndiaye Mamadou Lamine Badji Seïdou Kane Faculty of Sciences and Technology Department of Physics Cheikh Anta Diop University Dakar Senegal UFR Science and Technology Department of Physics University of Assane Seck Ziguinchor

Management of reservoir water resources requires the knowledge of flow inputs in this reservoir. Hydrological rainfall-runoff model is used for this purpose. There are several types of hydrological model according the description of the hydrological processes: black-box models, conceptual models, deterministic physical based model. SWAT is a semi-distributed hydrological model designed for water quality and quantity. This versatile tool has been used all around the world to assess and manage water resources. The main objective of the paper is to calibrate and validate the SWAT model on the watershed of Bafing located between 10°30' and 12°30' north latitude and between 12°30' and 9°30' west longitude to assess climate change on this river flows. A DEM with a resolution of 12.5 m × 12.5 m, the daily average flows and the daily observed precipitations on the period 1979-1986 (long period) are used as inputs for the calibration, while precipitations for the period 1988-1994 are used for the validation. The sensitivity analysis was done to detect the most determining coefficients during the calibration step. It shows that 19 parameters are required. Then, the effect of the period on the parameters calibration is checked by considering first the whole period of study and then each year of the period of study. The Nash criterion was used to compare the calculated and the observed hygrog

关键词： SWAT Hydrological Modelling Senegal River Bafing Makana

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