SedimentaryStudy of QarranquRiver Using Hec-Ras

ABSTRACT:Hec-Ras is an applied software package for simulation of river network in steady and unsteady flow regime. The sediment transport simulation is also added in 4.1 version. The goal of this paper is to investigate application and verification of it in transport modeling of rivers of East Azarbayjan province in Iran. For river network simulation, coupled use of ARCGIS,Hec-GeoRas and Hec-Ras modelswere used in Qarranquriver and tried to verify the model simulation with field survey. Due to the bed material and other characteristics of mentioned river and on the base of previous studies, the Laursen transport equation with Toffaleti fall velocity equation was applied in the simulation. At the end, different types of outputs resulted in both tabular and graphical moodsand the depositional and erosional processes of river network interoperated using effective indices like velocity, shear stress and bed level changes. It was found that the general of trend of transport activities could be verified by field survey but the magnitudes of them did not confirmed which reply high dependency of model to the selection of transport relationships.