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)

Authors

1 Dept. of Science and Water Engineering, Faculty of Agriculture, Urmia University, Urmia, Iran

2 Dept. of Water Engineering, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

10.22034/ceej.2024.59724.2312

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.

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References

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Journal of Civil and Environmental Engineering
Volume 55, Issue 118 - Serial Number 118
Spring 2025
June 2025
Pages 1-10

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