Simulation of River Hydraulics Behavior Using HEC-RAS Model in GIS Environment (Case Study: Beshar River, Kohgiloyeh and Boyerahmad Province)

Prediction of river hydraulic behavior for probable flood is most important in flood mitigation in the urban area and for installation has been make، farmland and other land use in river environs. In the other hand، flow estimation at a point in a river is vital for a number of hydrologic applications include flood forecasting. The human impacts on river channel limitation occur in various forms، which its intensity and weakness are different in various rivers. Therefore، simulating the hydraulic behavior of the rivers، in order to predict the damage caused by floods in various conditions، river engineering projects، feasibility study، economic and social programs and flood control and other studies related to the river system is necessary. The purpose of this study is to combination the hydraulic model HEC-RAS software and Arc View GIS software using HEC-GeoRAS extension for simulating the hydraulic parameters of river Basher located in the Kohgiloyeh & Boyerahmad province. The results of this study indicate that the HEC-RAS model can provide the appropriate numerical values for investigating the hydraulic characteristics of flow in rivers and for flood hazard mapping with more accuracy and low cost used.