Modeling of river hydraulic behavior for site selection the outlets of surface water system (case study: Rasht City, Iran).

摘要

Surface runoff drainage is one of the management problems in Rasht City, Iran. Also, one of the urban flood factors is drainage channel clogging through water level rising. The purpose of present study is to investigate the probability of drainage channels clogging and to select optimum sites for new outlets along Goharrood and Siahrood rivers. So, the rivers bed of Goharrood and Siahrood and their banks terrains were simulated by using HEC-GeoRAS(GIS) extension and digital map (scale:1000). Pick discharges with different return periods were estimated by using stochastic analysis. Then, hydraulic behavior of river were simulated by using HEC-RAS model and the probability of drainage channels clogging was investigated during flood events along Goharrood and Siahrood rivers length. Finally, unsuitable and suitable sites for runoff drainage were identified.