The rainfall thresholds of debris flow after Wenchuan earthquake in 7 rainy seasons
Numerous landslides were triggered in earthquake-affected areas and the largest ones were located close to the rupture fault.Numerous debris flows were triggered in the years after the earthquake during the rainy season.The triggering thresholds significantly decreased just after the Wenchuan and Chi-Chi earthquake events.The amount of loose sediments,deposited by the co-seismic landslides,was the main reason for a lowering of the meteorological thresholds for debris flows.The triggering threshold of debris flows decreased right after the earthquake,but increased thereafter over a period of several years.The decrease in the rainfall threshold for debris flows is strongly related to the increase in sediment material on the streambed.Conversely,the recovery of debris flow thresholds was strongly related to the decrease in sediment material on the streambed.However,there is no detailed information about the decrease and increase of thresholds in relation to the rainy seasons and the presence of loose sediments.
Bin Yu
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
国际会议
成都
英文
65-66
2015-05-09（万方平台首次上网日期，不代表论文的发表时间）