Influence of Disaster-Pregnant Factors on Debris Flow Hazard
Li Yongwei
Xu Linrong
Gu Fengyu
Su Na
Zhang Liangliang
Abstract：Few studies focus on the change of debris flow hazard,although the change of disaster-pregnant factors would affect the hazard of debris flow.Taking the Chutou gully as an example,this study aims to discover the impact of disaster-pregnant factors on the development of debris flow hazard from 2007 to 2021 based on entropy method and multi-source monitoring data.A monitoring system of debris flow hazard is proposed.The findings are as follows:materials of debris flow increased 27 times after the Wenchuan earthquake,and then the materials continued to decrease and would return to the pre-earthquake levels by 2027.The critical rainfall of debris flow in 2019 increased by 12.97%compared with 2013 and the debris flow might occur if the conditions met the formula f(Ih,P)≥R(34.40 mm).The value of debris flow hazard increased after the earthquake,and hazard value would reach the peak(very high hazard)under extreme rainfall then relatively decrease.The Chutou gully would keep the high level of debris flow hazard after 2021.The monitoring system of debris flow hazard is proposed to find the high hazard area of debris flow,which could provide some new clues for prevention and control of debris flow.
Keywords：disaster-pregnant factorsdebris flow hazardentropy methodchange lawmonitoring systemhazardsenvironmental geology
Publication Date：2025-11-30
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：12( 4571-4582 )