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| Study on the damage of the August 8，2017 Jiuzhaigou earthquake to debris flow mitigation engineering in the national park #br# |
| HUANG Hai1，2，SHI Shengwei1，2，YANG Shun1，2，TIAN You1，2，YANG Dongxu1，2，LIU Jiankang1，2#br# |
(1. Institute of Exploration Technology，Chinese Academy of Geological Sciences，Chengdu，Sichuan 611734，China；2. Technical Center for Geological Hazard Prevention and Control，China Geological Survey，Chengdu，Sichuan 611734，China)
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Abstract A magnitude Ms 7.0 earthquake struck the Jiuzhaigou World Natural Heritage Park，in Sichuan province，Southwest of China on August 8，2017，and trigged abundant coseismic landslides in the scenic spot. Due to 3 strong rainfalls，dozens of debris flow hazards occurred in the national park after the earthquake. Field survey，sampling test and comparative analysis were used to research the damage models of the debris flow mitigation engineering completed from 1984 to 2016. In total，there are 11 mitigation systems of debris flow gully suffering from partial damage such as Keze gully，Rize 1st gully，Rize 2nd gully and Shuzheng gully，and the engineering of Xuan gully near the Xiajijie lake. Striking of the earthquake the mitigation engineering would trigger a coseismic damage，mainly affected by topographic conditions and engineering structures. As the formed conditions changed，it also caused an indirect damage by increase the value of the charismatics of debris flow. The indirect damage，which has the characteristics of “multi-pathogenesis and same symptoms”，is controlled by the physical and dynamic characteristics of debris flows. Besides，the charismatics values of discharge and density，the driftwood of debris flow are other important factors to the engineering damage. When encountering a larger hazard than the standard of initial design，the mitigation engineering will cause 7 types of damages such as the impact，the abrasion，the erosion，and the damage due to flow direction change. It is suggested that the effects of discharge amplification and driftwood should be focused on for reconstructing the mitigation engineering of the national park after the earthquake.
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LIANG Binqi1, YANG Dongxu1, 2*, ZONG Xin1, WAN Fangkai1, ZHANG Wenwen1, LU Shuai3, LIU Yulin4, WANG Dongpo2. Risk regulation of debris-flow damming and back-silting amidst bridge clearance limits and retention-drainage coordination[J]. , 2026, 45(5): 1365-1377. |
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2020, Vol. 39 
