Simulating the Effect of River Dredging on the Extent, Depth, and Risk of Flooding Using The HEC-RAS (2D) Model in Areas with a Low Slope (Case Study: Agh-Ghala City)

Rezaei Ghaleh, Laleh; Rezaie, Hoseyn; Ghorbani, Khalil

doi:10.22034/ceej.2024.59724.2312

Islamic World Science Citation Center (ISC)

	Simulating the Effect of River Dredging on the Extent, Depth, and Risk of Flooding Using The HEC-RAS (2D) Model in Areas with a Low Slope (Case Study: Agh-Ghala City)
نشریه مهندسی عمران و محیط زیست
Article 1, Volume 55, Issue 118, 2025, Pages 1-10 PDF (6.34 M)
DOI: 10.22034/ceej.2024.59724.2312
Authors
Laleh Rezaei Ghaleh¹; Hoseyn Rezaie^* ¹; Khalil Ghorbani²
¹Dept. of Science and Water Engineering, Faculty of Agriculture, Urmia University, Urmia, Iran
²Dept. of Water Engineering, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Abstract
Throughout the world, hydraulic models are used to simulate floods. Gorgan Roud River has historically caused significant damage to Golestan province. This study aimed to investigate the impact of dredging on the 2018 flood in Golestan province. Riverbed adjustments of 0.5, 1, and 2 meters were applied to the Gorgan Roud River using GIS software and the HEC-GeoRAS plugin from the outlet of Voshamgir dam to Agh-Ghala City. The DEM of the region was corrected to account for these changes. The flood area, depth, and velocity of the 2018 flood in Golestan province were simulated using HEC-RAS (2D) software, taking into account the effects of dredging. The results indicate that dredging increased the water flow capacity of the Gorgan Roud River but did not reduce the flood extent, especially in the upstream area. However, it reduced the level of flooding in Agh-Ghala. Risk maps demonstrate that dredging to 0.5, 1, and 2 meters, reduced the depth of high-risk areas in Agh Ghala city by 1.1%, 4.7%, and 12.7%, respectively.
Keywords
Gorgan-Roud; Dredging; 2D Simulation; HEC-RAS; Flood

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Simulating the Effect of River Dredging on the Extent, Depth, and Risk of Flooding Using The HEC-RAS (2D) Model in Areas with a Low Slope (Case Study: Agh-Ghala City)