Rainfall-triggered debris flows following the Wenchuan earthquake
Rainfall-triggered debris flows following the Wenchuan earthquake
复制标题
汶川地震后降雨引发泥石流
DOI：
10.1007/s10064-009-0201-6
复制
发表时间：
2009-05-01
影响因子：
4.2
通讯作者：
Liang, J. T.
中科院分区：
文献类型：
--
作者：
Tang, C.;Zhu, J.;Liang, J. T.
2008年9月24日，汶川大地震受灾区中部的强降雨引发了72次泥石流。本文描述了研究区泥石流的形成和输运过程，并对降雨、岩性和断层的存在所起的作用进行了实地观察。很可能在地震后，与地震前的值相比，引发泥石流所需的累积降水量和小时降雨强度的临界值有所降低。本文以北川西山坡沟为例，介绍了泥石流在北川造成的泥石流堆积。研究结果表明，汶川地震后的整个地区现在更容易发生泥石流，泥石流可能是由局部强降雨引发的。必须注意适当评估这种新型地质灾害。
On 24 September 2008, 72 debris flows were triggered by heavy rainfall in the central part of the area affected by the Wenchuan Earthquake. This paper describes the process of debris-flow initiation and transport in the study areas and presents field observations on the roles of rainfall, lithology and the presence of faults. It is likely that following the ground shaking, the critical amount of accumulated precipitation and the hourly rainfall intensity necessary to initiate debris flow was reduced compared with values before the earthquake. A case study in the Xishanpo gully is presented; the debris flow from which caused a thick accumulation in the already devastated city of Beichuan. It is concluded that the whole of the area shaken by the Wenchuan Earthquake is now more susceptible to debris flows, which may be initiated by localized heavy rainfall. Care must be taken to properly assess this new type of geo-hazard.