Title: Dynamic Evolution Process of Sediment Supply for Debris Flow Occurrence in Longchi of Dujiangyan,Wenchuan Earthquake Area
Abstract:5·12Wenchuan Earthquake of China produced abundant debris left behind on the hillside slopes, when encountering heavy rains,it will generate debris flow. On 13thOctober 2010,a total of 48 debris flows...5·12Wenchuan Earthquake of China produced abundant debris left behind on the hillside slopes, when encountering heavy rains,it will generate debris flow. On 13thOctober 2010,a total of 48 debris flows were triggered by heavy rainfall in the central part of the epicenter region affected by the Wenchuan Earthquake. 12 debris flows of Longchi,Dujiangyan County of China in the central epicenter region are chosen for analyzing the change of debris flow source area before and after the earthquake and also following a rainstorm. Significant differences after the earthquake and rainstorm are noticed in producing a large amount of landslides for debris flow occurrence. Through the remote sensing interpretation,combining with field investigation,this paper expounds debris flow source activity in the studied area. Comparison of the TM images taken on 18thSeptember 2007( before the 5·12Wenchuan earthquake) with the SPOT 5 images taken on 10thFebruary 2009( after the 5·12Wenchuan earthquake) indicates that the landslide area in 12 debris flow watersheds increases from 0. 86 × 106m3to 42. 30 × 106m3during that period of time,which means landslide volume increases 4 835. 94% after Wenchuan earthquake. Comparison of the SPOT 5 images taken on 10thFebruary 2009( after t the 5·12Wenchuan earthquake) with the WorldView-2 images taken on 14thJuly 2011( after the8·13rainstorm event) indicates that the landslide area in 12 debris flow watersheds increases from 42. 30 × 106m3to 68. 85 × 106m3during that period of time,which means landslide volume increases 62. 76 % after rainstorm.Read More
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 1
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