Journal
NATURAL HAZARDS
Volume 69, Issue 3, Pages 1835-1847Publisher
SPRINGER
DOI: 10.1007/s11069-013-0772-1
Keywords
Drainage channel; Check dam; Debris flow; Zhouqu County; Impact force
Funding
- China Geological Survey
- Key Laboratory of Geo-hazards in the Loess Area
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On August 7 and 8, 2010, a catastrophic debris flow disaster occurred in Zhouqu County in northwestern China's Gansu Province. The large-scale debris flow event destroyed more than 200 buildings, killing approximately 1,700 people. Field investigations showed that the debris flow disaster was not only a natural hazard but also anthropogenic. First, the partial implemented check dams had not formed an integral blocking system to resist large events. Second, poor-quality workmanship contributed to the breakage of check dams. Third, disorderly placement of houses and buildings on the fan structure rendered the cross-sectional area of drainage channel too small to accommodate such a large event. The lessons learned from these hazards may be valuable for improving protective measures against these types of very large debris flow events in northwestern China in the future.
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