American Journal of Water Resources
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American Journal of Water Resources. 2015, 3(5), 147-154
DOI: 10.12691/ajwr-3-5-2
Open AccessArticle

Using of Hec-ras Model for Hydraulic Analysis of a River with Agricultural Vocation: A Case Study of the Kayanga River Basin, Senegal

Vieux Boukhaly Traore1, , Mamadou Bop1, Moustapha Faye2, Giovani Malomar2, El Hadj Oumar Gueye3, Hyacinthe Sambou4, 5, Abdoulaye Ndiaye Dione3, Sidy Fall6, Amadou Tahirou Diaw5, Joseph Sarr2 and Aboubaker Chedikh Beye1, 7

1Department of Physics ,Faculty of Science and Technology, Hydraulics Laboratory and Fluid Mechanics (LHMF),University Cheikh Anta Diop (UCAD), Dakar, Senegal

2Laboratory of Fluid Mechanics and Applications (LMFA), University Cheikh Anta Diop (UCAD), Faculty of Science and Technology, Dakar, Senegal

3Laboratory of physics solid and sciences of materials, University Cheikh Anta Diop (UCAD), Faculty of Science and Technology ,Dakar, Senegal

4Institute of Environmental Sciences, Faculty of Science and Technology, University Cheikh Anta Diop (UCAD), Dakar, Senegal

5Teaching Laboratory and Research in Geomatics (LERG), Faculty of letters and Social Sciences, Department of Geography, University Campus of Polytechnic High School, Dakar, Senegal

6Office Lake Guiers Company for the Development and Operation of Lands Senegal River Delta and the Valleys of the Senegal River and Faleme (SAED), Saint Louis, Senegal

7Laboratory of Fluid Mechanics and Applications (LMFA), University Cheikh Anta Diop (UCAD), Faculty of Science and Technology, Dakar, Senegal;Laboratory of physics solid and sciences of materials, University Cheikh Anta Diop (UCAD), Faculty of Science and Technology ,Dakar, Senegal

Pub. Date: November 16, 2015

Cite this paper:
Vieux Boukhaly Traore, Mamadou Bop, Moustapha Faye, Giovani Malomar, El Hadj Oumar Gueye, Hyacinthe Sambou, Abdoulaye Ndiaye Dione, Sidy Fall, Amadou Tahirou Diaw, Joseph Sarr and Aboubaker Chedikh Beye. Using of Hec-ras Model for Hydraulic Analysis of a River with Agricultural Vocation: A Case Study of the Kayanga River Basin, Senegal. American Journal of Water Resources. 2015; 3(5):147-154. doi: 10.12691/ajwr-3-5-2

Abstract

In West Africa, there is serious asymmetry on food safety between consumers and food producers. This made that the management system of food safety in many developing countries became a top priority for authorities and decision makers. In Senegal, the government has selected the flood plain of Kayanga River to develop irrigated agriculture through rice cultivation to promote the food safety. For this, two dams (Niandouba and Confluent) have been built to reinforce water availability .The management of this hydraulic system required the better knowledge of its water resources through the dynamic of the flow. In this paper, we used Hec-ras model to compute the flow characteristics to analyze the hydraulic behavior of this system. The river reach selected, is located between the Niandouba dam and Kounkane threshold. From the DEM of this area, we have divided the river reach into 78 cross sections perpendicular to flow direction and numbered from 1 to 78. Arcgis software is used to extract the bathymetry for each cross section and the distance between two adjacent cross sections. This step allows creating the river geometry with Hec-ras. Four stream flows have successively fixed at Niandouba dam outlet as upstream boundaries. For each stream flow, Hec-ras calculate flow characteristics including: water surface profiles, energy grade line, water surface elevation, flow velocity, flow area, total surface area, volume, wetted perimeter, Froude number, top width, specif force, shear total, power total ,friction loss, head loss, conveyance total, and slope. The high, low and constant flow characteristics areas have been located. The large and narrow section sectors have also been identified allowing estimating floodplain. Certain of these flow characteristics such as the volume, total surface area…decrease from upstream to downstream. Flow velocities are substantially higher in the main channel than in the floodway. This study provides an opportunity for stakeholders to identify important elements of irrigated agriculture for investment plans in this area.

Keywords:
hec-ras hydraulic analysis kayanga river basin hydraulic behavior water resources knowledge food safety

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