四川省汶川县板子沟8•20泥石流成因与易损强度分析∗
Formation and Vulnerability Analysis for Debris Flow Occurred on 20 August 2019 in Banzi Catchment, Wenchuan County, Sichuan Province, China
- 防灾减灾工程学报 2021年第2期 页码：238-245
- 作者机构：
成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川,成都,610059
- 作者简介：
- 基金信息：国家重点研发计划项目(2017YFC1501004)、国家自然科学基金项目(41672299)资助
DOI：
中图分类号： P642.23-
纸质出版：2021
- 稿件说明：
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李明威,唐川,陈明,龚凌枫.四川省汶川县板子沟8•20泥石流成因与易损强度分析∗[J].防灾减灾工程学报,2021,(2):238-245
Li Mingwei. Formation and Vulnerability Analysis for Debris Flow Occurred on 20 August 2019 in Banzi Catchment, Wenchuan County, Sichuan Province, China[J]. 2021, (2): 238-245.
摘要
2019 年 8 月 20 日，四川省汶川县绵虒、三江、水磨镇爆发大规模群发性泥石流灾害，造成大量人员伤亡和经济损失。以绵虒镇板子沟泥石流为典型实例，通过泥石流灾害前后遥感影像的解译和对比分析，以及雷达数据获取的流域内不同海拔位置的降雨数据，从物源和降雨两个角度分析了泥石流灾害的成因。利用 FLO‐2D 数值模拟方法分析并计算此次泥石流强度指数，作为泥石流危险性的表征关键参数。基于板子沟流域典型建筑物类型的调查，构建了易损性曲线，量化了承灾体易损强度。研究结果表明：汶川地区泥石流致灾性和风险性仍处于较高水平，应进一步研究强震区泥石流灾害发生规律及风险性，为泥石流预警工作与有效工程防治提供科学参考。
Abstract
On August 20，2019，a large-scale mass landslide disaster occurred in Miansi，Sanjiang， and Shuimo，Wenchuan County，Sichuan Province，causing a large number of casualties and huge economic losses. This paper takes Banzi catchment in Miansi town as an example. Through interpretation and comparative analysis on remote sensing images before and after the 8.20 debris flow disaster， and on account of rainfall data at different altitudes in the watershed acquired by radar，the cause of the 8.20 debris flow disaster in Banzi catchment was analyzed from the perspective of source and rainfall. The FLO-2D numerical simulation method was used for analyzing and calculating the debris flow intensity index，which is the key parameter for the characterization of the debris flow danger. Based on the survey of typical building types in the Banzi catchment，a vulnerability curve was constructed to quantify the vulnerability strength of the affected body. The results show that the hazard and risk of debris flow in the Wenchuan earthquake area are still at a high level. Therefore，the occurrence law and risk of debris flow disaster in the strong earthquake area should be further explored to provide a scientific reference for early warning and effective engineering measures.
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