Mechanism of post-seismic floods after the Wenchuan earthquake in the upper Minjiang River,China |
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| Authors: | Ding Hairong Li Yong Shao Chongjian Lauvence Svirchev Xu Qiang Yan Zhaokun Yan Liang Ni Shijun Shi Zeming |
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| Institution: | 1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,China;2.College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu,China;3.National Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu University of Technology,Chengdu,China;4.Chengdu University of Technology,Chengdu,China |
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| Abstract: | By analyzing the multi-year runoff and rainfall data at 15 hydrological stations from 1980 to 2007, as well as monthly runoff data from 1964 to 1984 at the Zipingpu hydrologic station, the relationship between precipitation and runoff has been established and the trend was explored. Based on the catastrophic floods of August 13 and August 18, 2010, characteristics and control factors on the post-seismic floods are summarized. Firstly, the Wenchuan earthquake and rupture zone provides the background for post-seismic floods to develop in the upper Minjiang River, which follows a post-seismic disaster-chain pattern: earthquake collapse to landslide debris flows to floods. Secondly, heavy rainfall controlled by the orographically-enhanced precipitation after the Wenchuan earthquake is the trigger factor for the development of devastating post-seismic floods. Thirdly, the post-seismic floods contain high sediment discharge, cause abrupt and severe damages, and have a large of volume and higher frequency. |
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