Evolution process of sediment supply for debris flow after Wenchuan earthquake
In order to analyze the changes in the sediment budget after the Wenchuan earthquake and after the heavy rain events in the following years,12 debris flow gullies in the Longchi Dujiangyan County were selected.A comparison of the TM images taken on 18th September 2007 (before the 5.12Wenchuan earthquake) with the SPOT5 images taken on 10th February 2009 (after the 5.12Wenchuan earthquake)indicates that the landslide area in the 12 debris flow watersheds increased from 83.1×103m2 to3126.5× 103m2.Also the gully length increased by 60.55% and the area with deposits in the channel bed by134.80%.A comparison of the SPOT5 images taken on 10th February 2009 (after the 5.12Wenchuan earthquake) with the WorldView-2 images taken on 26th April 2011 (after the large rainstorm event in August 2011) showed that the landslide area increased by 24.8% from 3126.5×103rn2 to3902.8×103m2.while the gully length increased by 26 % and the channel deposits by 12%.A Comparison of the WorldView-2 images taken on 26th April 2011 with the WorldView-2 images taken on14th July 2011 indicated that the landslide area increased in this relatively dry period by only 2.3%.
Wenchuan earthquake Debris flow Landslides Dynamic evolution Remote sensing
CHANG Ming TANG Chuan
State Key Laboratory of Geohazards Prevention and Environment Protection, Chengdu University of Technology, Chengdu 610059, China
国际会议
成都
英文
153-155
2015-05-09（万方平台首次上网日期，不代表论文的发表时间）