The Wenchuan （汶川） earthquake on 12 May 2008 induced a large number of landslides, collapses, and rockfalls along the Longmenshan （龙门山） fault. The landslide in Niujnau （牛圈） Valley （named Niujuan landslide...The Wenchuan （汶川） earthquake on 12 May 2008 induced a large number of landslides, collapses, and rockfalls along the Longmenshan （龙门山） fault. The landslide in Niujnau （牛圈） Valley （named Niujuan landslide）, close to the epicenter, is one that travelled a long distance with damaging consequences. Using QuickBird satellite images and GIS tools, the seismogenic mass movements are analyzed, and the movement phases, travel path, and post-catastrophic processes of Niujuan landslide are described and discussed. Image interpretation and a GPS survey showed that the mass movements denuded 37% of the research area. The Niujuan landslide moved 1 950 m along the Lianhuaxingou （莲花心沟） stream, transformed to a debris avalanche, and accumulated in the downstream bed of Niujuan Valley, where they formed a dam 30 m in height, blocking the Niujuan stream and creating a barrier lake basin with 0.11 million m3 storage capacity. Subsequent to the Ninjuan landslide, debris flowshave been more active in Lianhuaxingou and Niujuan valleys because of the accumulated mass of debris.展开更多
This research is devoted to Taniashan Lake, a quake landslide-dammed lake, situated in Sichuan Pro- vince, China, which was formed by a landslide triggered by the Wenchuan Earthquake on 12 May 2008. A STREAM_2D two-di...This research is devoted to Taniashan Lake, a quake landslide-dammed lake, situated in Sichuan Pro- vince, China, which was formed by a landslide triggered by the Wenchuan Earthquake on 12 May 2008. A STREAM_2D two-dimensional hydrodynamic model of Russia was applied to simulate the process of two flood scenarios： 1, lake dam outbreak, and 2, dam overtopping. An artificial dam outbreak was made after the earthquake to lower the water level of the lake in 2008, which led to a great flood with a maximum water discharge of more than 6400 m3/s. The negative impact of the flood was reduced by a timely evacuation of the population. Flood hazards still remain in the event of new landslides into the lake and lake dam overtopping （Scenario 2）, in which case a maximum water discharge at the dam crest would reach 5000 m3/s, placing the population of Shabacun and Shilingzi villages in the zone of flood impact.展开更多
基金supported by the NSFC-RFBR Projects (Nos. 40911120089, 08-05-92206 NSFCa)the Russian Leading Science Schools Programme (No. НШ-3405.2010.5)+1 种基金the Interna-tional Cooperation Project of the Ministry of Science and Technology of China (No. 2009DFR20620)the International Cooperation Project of the Department of Science and Technology of Sichuan Province (No. 2009HH0005)
文摘The Wenchuan （汶川） earthquake on 12 May 2008 induced a large number of landslides, collapses, and rockfalls along the Longmenshan （龙门山） fault. The landslide in Niujnau （牛圈） Valley （named Niujuan landslide）, close to the epicenter, is one that travelled a long distance with damaging consequences. Using QuickBird satellite images and GIS tools, the seismogenic mass movements are analyzed, and the movement phases, travel path, and post-catastrophic processes of Niujuan landslide are described and discussed. Image interpretation and a GPS survey showed that the mass movements denuded 37% of the research area. The Niujuan landslide moved 1 950 m along the Lianhuaxingou （莲花心沟） stream, transformed to a debris avalanche, and accumulated in the downstream bed of Niujuan Valley, where they formed a dam 30 m in height, blocking the Niujuan stream and creating a barrier lake basin with 0.11 million m3 storage capacity. Subsequent to the Ninjuan landslide, debris flowshave been more active in Lianhuaxingou and Niujuan valleys because of the accumulated mass of debris.
文摘This research is devoted to Taniashan Lake, a quake landslide-dammed lake, situated in Sichuan Pro- vince, China, which was formed by a landslide triggered by the Wenchuan Earthquake on 12 May 2008. A STREAM_2D two-dimensional hydrodynamic model of Russia was applied to simulate the process of two flood scenarios： 1, lake dam outbreak, and 2, dam overtopping. An artificial dam outbreak was made after the earthquake to lower the water level of the lake in 2008, which led to a great flood with a maximum water discharge of more than 6400 m3/s. The negative impact of the flood was reduced by a timely evacuation of the population. Flood hazards still remain in the event of new landslides into the lake and lake dam overtopping （Scenario 2）, in which case a maximum water discharge at the dam crest would reach 5000 m3/s, placing the population of Shabacun and Shilingzi villages in the zone of flood impact.
