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 Urmia University

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

3 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

Hydraulic models are used all over the world to simulate floods. As the most watery river in Golestan province, Gorgan River has always caused great damage to the province. In this study, in order to investigate the effect of dredging on the flood of Golestan province in 2019, the elevations of the Gorganrood River from the outlet of the Vashamgir dam to the city of Aqqola were changed by 0.5, 1 and 2 meters using GIS software and HEC-GeoRAS plugin, and the DEM of the area was The application of these changes was corrected. HEC-RAS (2D) software was used to simulate the area, depth and speed of the flood of 2019 in Golestan province, considering the effect of dredging. The results showed that dredging, while increasing the water flow capacity of Gorgan River, did not show a significant effect in reducing the flood zone, especially in the upstream of the studied area, but it reduced the level of flooding in Aqqola city. Also, the risk maps showed that by applying dredging to the extent of 0.5, 1, and 2 meters, the depth of high-risk areas in Aqqola city was reduced by 1.1, 4.7, and 12.7 percent, respectively.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 28 February 2024

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