The Critical Rainfall Characteristics for Torrents and Debris Flows in the Wenchuan Earthquake Stricken Area

作     者：CHEN Ningsheng YANG Chenglin ZHOU Wei HU Guisheng LI Huan David Han CHEN Ningsheng a,b ,YANG Chenglin a,b,ZHOU Wei a,b,HU Guisheng a,b,LI Huan c,and David Hand a Key Lab of Mountain Hazards and Surface Processes,Chinese Academy of Sciences,Chengdu,China,610041 b Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu,China,610041 c College of Water Resource & Hydropower of SCU,Chengdu,China,610065 d Department of Civil Engineering,University of Bristol,UK

作者机构：Key Lab of Mountain Hazards and Surface Processes Chinese Academy of Sciences Chengdu China610041 Institute of Mountain Hazards and Environment ChineseAcademy of Sciences Chengdu China 610041 College of Water Resource & Hydropower ofSCU Chengdu China 610065 d Department of Civil Engineering University of Bristol UK Department of Civil Engineering University of Bristol UK 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2009年第6卷第4期

页      面：362-372页

核心收录：

学科分类：082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 070801[理学-固体地球物理学] 0907[农学-林学] 07[理学] 08[工学] 0828[工学-农业工程] 0708[理学-地球物理学] 09[农学] 0815[工学-水利工程] 

基　　金：financially supported by the Scholarship of Knowledge Innovation Project  Chinese Academy of Sciences (KZCX2-YW-332) 

主　　题：Debris flow Mountain torrent Earthquake-stricken area Critical rainfall 

摘      要：Critical rainfall assessment is a very important tool for hazard management of torrents and debris flows in mountainous areas. The Wenchuan Earthquake 2008 caused huge casualties and property damages in the earthquake-stricken area,which also generated large quantities of loose solid materials and increased occurrence probabilities of debris flows. There is an urgent need to quantify the critical rainfall distribution in the area so that better hazard management could be planned and if real time rainfall forecast is available,torrent and debris flow early-warning could be issued in advance. This study is based on 49-year observations (1954-2003) of up to 678 torrent and debris flow events. Detailed contour maps of 1 hour and 24 hour critical rainfalls have been generated (Due to the data limitation,there was insufficient 10 minute critical rainfall to make its contour map). Generally,the contour maps from 1 hour and 24 hours have similar patterns. Three zones with low,medium and high critical rainfalls have been identified. The characteristics of the critical rainfall zones are linked with the local vegetation cover and land forms. Further studies and observations are needed to validate the finding and improve the contour maps.