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Abstract of the Article

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Determination of river bed and boundary by HEC-RAS & AUTOCAD case study: Karaj river reach(Sira- Pole khab)

Authors:
[ Arman ] - Senior Engineer, Yekom Counsulting Engineer,River Engineering Dep, North Saba, Tehran
[ Salajegheh ] - Assistant Professor, Faculty of Natural Resources, University of Tehran

Abstract:

The Determination of river bed and boundary accomplished by computational hydraulic and mathematical models. The limit of flood spreading with a known discharge is an index for dtermination of river bed in law. HEC-RAS was used for calculating and simulating steady and unseady flows in rivers. To facilitate using the results, the output was represented in GIS. This case study used 1:500 scale topography map for cross section. The bridges, buldings, … were considered and to enhance the accuracy cross-sections were surveyed at 50 meters interval which works out 44 cross-sections in the study area. Results of research mark that the sharp slope in the reach has a little effect on increasing high flood, so does roughness coefficient.

Keywords:

Karaj river (Sira- Pole khab), boundary and river bed, HEC-RAS & AUTOCAD softwares