地质科技通报2024，Vol.43Issue(2)：215-225,11.DOI:10.19509/j.cnki.dzkq.tb20230153
基于RAMMS数值模拟的短时强降雨型泥石流危险性评价
Hazard assessment of debris flow induced by short-time heavy rainfall based on RAMMS numerical simulation
摘要
Abstract
[Objective]Debris flows caused by short-term heavy rainfall are a frequent occurrence in Zhejiang Province and pose a serious threat to the lives and property of mountain residents.Therefore,the assessment of debris flow risk has significant theoretical and practical value for disaster management in the province.To investi-gate the hazard of debris flows caused by short-term heavy rainfall,the Wushankeng watershed was selected for re-search by means of field investigations and remote sensing interpretations,combined with numerical simulation.[Methods]The obtained results revealed the geological environment,development characteristics and disaster chain formation mechanism of debris flow in the watershed.The RAMMS numerical simulation software was used to simulate the debris flow depth and the velocity under different rainfall frequencies,and the hazard assessment was carried out based on these movement characteristics.[Results]The results of the research indicated that loose rock and soil at steep slopes experienced shallow landslides under the effect of short-term heavy rainfall.Then,under the control of the slope and gully topography,it migrated to the mouth of the gully,and during the movement,the scale of the debris flow was expanded by erosion.Finally,it was deposited in the wide and gentle accumulation area.As the intensity of the study area rainfall increased to a 50-year or 100-year occurrence,the scale of the deb-ris flow increased,but it was limited by the gentle topographical conditions of the accumulation area,and it was un-able to effectively discharge at the mouth of the gully.However,the indicators of mud depth and flow velocity in the resident areas upstream of the accumulation fan significantly increased,and the area of high-intensity areas in the accumulation area increased from 7 276 m2 to 12 660 m2.Combined with the results of debris flow activity anal-ysis,the combination of rainfall monitoring in the formation area,constructing rigid,flexible,or slit check dams in the circulation area of the main channel,and setting up drainage channels in the accumulation area can effectively protect the lives and properties of residents.[Conclusion]The research results can provide reference for debris flow hazard assessment and engineering treatment in the study area and Zhejiang Province.关键词
短临强降雨/泥石流/灾害链/RAMMS/危险性评价Key words
short-time heavy rainfall/debris flow/disaster chain/RAMMS/hazard assessment分类
天文与地球科学引用本文复制引用
庞海松,谢骏锦,张小明,王官贺,张明..基于RAMMS数值模拟的短时强降雨型泥石流危险性评价[J].地质科技通报,2024,43(2):215-225,11.基金项目
国家自然科学基金项目(41472264) （41472264）
