Dynamic Analysis of Flood Risk using HEC-RAS Hydraulic Model (Case Study: Shahinshahr River, Isfahan Province)

جغرافیا و مخاطرات محیطی

Article 5, Volume 11, Issue 1 - Serial Number 41, March 2022, Pages 77-97   

Document Type: Research Article

DOI: 10.22067/geoeh.2021.71679.1093

Authors

Seyed Meysam Moshashaie¹; Roya Panahi^{* 2}; Mitra Moshashaie³

¹Expert in River Engineering, Navandish Water Processors Consulting Engineers Company, Kurdistan, Iran

²aDepartment of Physical Geography, Shahid Beheshti University, Tehran, Iran

³MSc in Surveying (Remote Sensing), Faculty of Civil Engineering, University of Kurdistan, Kurdistan, Iran

Abstract

Flooding is a natural phenomenon and the risk of its occurrance in urban areas is a global issue. Rapid urbanization and climate changes have increased the risk of urban flooding, leading to massive infrastructure and human losses. The aim of this study was geomorphological zoning of Shahinshahr River flood risk. Therefore, the HEC-RAS numerical model was used to simulate the flood. The geometric data was processed in GIS by HEC–GEORAS extension. The return periods of 25, 50, and 100 years of catchment area as well as its physiographic characteristics including area, length of main stream, CN curve number, concentration time, latency in the watershed were entered into the HEC-HMS software. Accordingly, the maximum flood discharge with different return periods were calculated whereby the river area was devided into three reaches. Finally, manning's roughness coefficient was calculated for each reach that the Manning roughness coefficient was calculated using the Coon method. The results show that the flood zone in the 25-year return period includes 0.948  km², 1.13 km² in the 50-year return period, and 1.34 km² of the lands along the Shahinshahr River in the 100-year return period. In the last reach, due to the reduction of the slope and the flow velocity, the flood zone has become wider than other periods.

Keywords

Flood Simulation; Flood Risk; Shahinshahr River; HEC-RAS

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