Estimation of Dinevar River flood risk using Australian standard method

جغرافیا و مخاطرات محیطی

Article 4, Volume 13, Issue 3 - Serial Number 51, November 2024, Pages 75-100   

Document Type: Research Article

DOI: 10.22067/geoeh.2023.83238.1390

Authors

Roya panahi^{* 1}; Mohammad Mahdi Hosseinzadeh²

¹Ph.D in Geomorphology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran,Iran.

²Associate Professor in Geomorphology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran.

Abstract

Floods are among the greatest threats to social security and the sustainable development of society. They can cause widespread devastation, resulting in loss of life and significant damage to personal property and critical public infrastructure. The purpose of this research is to zone and estimate the flood risk of the Dinevar River using the Australian Standard Method.
Flood simulation was conducted using the HEC-RAS (version 6.1) one-dimensional hydrodynamic model. Geometric data were processed in GIS using the HEC-GeoRAS extension. The peak discharge for different return periods was calculated using HyfranPlus software and the Gamma distribution. After modeling and extracting flow parameters (velocity and depth), flood risk zoning was performed based on the Australian Standard Method, which uses the product of two parameters: depth and flow velocity (D*V).
According to the river's morphology, it was divided into three sections. The results of the model indicate that in the first section, the flood zone did not expand significantly. However, in the second and third sections, the flood covered extensive rural areas and agricultural lands during the return periods of 25, 50, and 100 years. The majority of the region falls within the H3 and H4 risk zones, highlighting the urgent need to prioritize flood management and risk reduction strategies in future planning efforts.

Keywords

flood Risk Zoning; HEC-RAS Model; Australian Standard Method; Hydrodynamic Simulation; Peak Discharge; Risk Management Strategies

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