Destruction to buildings by debris flows is a major cause of casualties and economic losses.Studying vulnerability of buildings under debris flow conditions is a key step in assessing debris flow risk.This research focuses on the Qingjiagou area in the Changjiang River Basin,utilizing FLO-2D software to simulate the dynamic processes of debris flows under extreme rainfall scenarios with return periods of 20,50,and 100 years.Hazard zonation was performed based on debris flow intensity(hv).Addi-tionally,vulnerability assessment curves suitable for masonry structures in the Changjiang River Basin were developed,based on this we provided a risk evaluation method based on the dynamic processes of debris flows and building vulnerability analysis.The research results indicated that the accuracy of the FLO-2D simulation reached 79%,with a correlation coefficient(R2)of 0.88 for the vulnerability curves,demonstrating good assessment results.As rainfall intensity increased,the total area of risk zones in the study area expanded from 33 000 m2 to 39 900 m2,increase by 20.8%.The areas classified as high and very high risk signifi-cantly increased from 6 800 m2 to 8 600 m2,increase by 27.1%.The number of houses located above the low-risk zone in-creased from 7 to 11,indicating that buildings initially in low-risk zones may face heightened risks.Finally,collaborative meas-ures for ecological prevention and engineering control were proposed,providing reasonable recommendations for disaster prevention and mitigation against debris flows in the Changjiang River Basin.
关键词
泥石流风险评价/易损性分析/FLO-2D软件/卿家沟泥石流/长江流域
Key words
debris flow risk assessment/vulnerability analysis/FLO-2D software/Qingjiagou debris flow/Changjiang River Basin
维普
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