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Huang, Runqiu; Li, Weile
Engineering geology, 11/2014, Letnik: 182Journal Article
The Ms 8.0 Wenchuan earthquake on May 12, 2008 triggered tens of thousands of landslides and produced large amounts of loose material. The loose material accumulated in gullies or on slopes provides abundant sources for the consequent debris flows, which will endanger resettled residents and destroy urban reconstruction. During the 5years following the Wenchuan earthquake event, heavy rainfalls have already induced a great number of debris flows in the earthquake-damaged area, resulting in serious casualties and property losses. The co-seismic landslides and the debris flows induced by rainfalls in the Mianyuan River basin are analyzed using multi-temporal remote sensing images. More than 2000 landslides were triggered and about 4.0×108m3 of loose material was generated in the Mianyuan River basin, and the volume of erodible material is 6.0×107–1.6×108m3. There were 1.27×107m3 of bed load sediments and 6.3×105m3 suspended load sediments transported into the river system in the past 5years. The active mass movements will last for a long period in the Mianyuan River basin. •Characteristics of post-seismic landslides following the 2008 Wenchuan earthquake•2259 landslides mapped in the Mianyuan River basin, with a volume of 4.0×108m3•The volume of erodible material is 6.0×107–1.6×108m3 in the Mianyuan Riverbasin.•Only 1.27×107m3 of bed load has been transported into the Mianyuan River.•Active mass movements will last for a long period in the Mianyuan River basin.
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