Debris Flow Hazard Evaluation under the Influence of Retaining Dam
Li Yongwei
Xu Linrogn
Shang Yonghui
Chen Shuyang
Abstract：The debris flow hazard was more serious with the increase of occurrence probability of low-frequency debris flow after the earthquake.Resulting in the damage of retaining dam and reduction of its capabilities in disaster prevention and reduction.But few studies payed attention to the influence of retaining dam on debris flow hazard.Moreover,disaster-pregnant factors were usually used as the index of debris flow hazard,but the result of hazard evaluation could not completely reflect the destructive power and intensity of debris flow.Thus,the dynamic parameters of debris flow and the stability coefficient of retaining dam in different return periods were calculated in Chutou gully.And the debris flow hazard was evaluated based on dynamic parameters of debris flow and improved entropy method.And the control relationship between retaining dam and debris flow hazard was analyzed.The study findings were as follows:Reasonable evaluation results could be obtained by dynamic parameters and improved entropy method.The values of debris flow hazard were decreased about 12.27%～43.75%with different return periods(1%,2%,5%and 10%)under the influence of the retaining dam,due to the discharge of debris flow was decreased below the retaining dam.This work may provide some new clues for prevention and control of debris flow and optimum design of retaining dam.
Keywords：retaining damdynamic parametersimproved entropy methoddebris flow hazardengineering geology
Publication Date：2024-08-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 2839-2850 )