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Article

Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China

by 1,2,3, 1,2,*, 2,4, 1,2 and 1
1
MOE Key Laboratory of Western China’s Environmental Systems, School of Earth Sciences, Lanzhou University, Lanzhou 730000, China
2
Technology & Innovation Centre for Environmental Geology and Geohazards Prevention, School of Earth Sciences, Lanzhou University, Lanzhou 730000, China
3
Academy of Disaster Reduction and Emergency Management, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
4
College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Kevin Fleming
Water 2021, 13(5), 639; https://doi.org/10.3390/w13050639
Received: 29 December 2020 / Revised: 19 February 2021 / Accepted: 22 February 2021 / Published: 27 February 2021
(This article belongs to the Special Issue New Multi-Hazard Risk Assessment Methods for Extreme Rainfall Events)
In recent years, the intensified influences of global climate change and human activities have increased the frequency of large-scale debris flow disasters. As a result, main river channels often become blocked, thus forming a disaster chain of rivers dammed by debris flow followed by outburst flooding. In order to quickly and easily reveal the dynamic process of a debris flow dam breach, and quantitatively predict the outburst flood hazard, this study takes the Zhouqu “8.8” debris flow barrier dam in Western China as an example. Based on a stability assessment, China Institute of Water Resources and Hydropower Research’s Dam Breach Slope (DBS-IWHR), China Institute of Water Resources and Hydropower Research’s Dam Breach (DB-IWHR), and Hydrologic Engineering Center’s River Analysis System (HEC-RAS) were integrated to simulate the development of dam breach, breach flood, and outburst flood evolution, respectively, under different scenarios. The simulated peak discharge flow of the actual spillway was 317.15 m3/s, which was consistent with the actual discharge of 316 m3/s. The results under different scenarios showed that, with the increased inflow of the barrier lake, the erosion rate of the dam increased, the peak discharge of the dam break flood increased, the peak arrival time shortened, and the downstream flooding area increased. These findings could provide scientific support for risk management and emergency decision-making with respect to barrier dam failure. View Full-Text
Keywords: Zhouqu debris flow; barrier dam; dam break; outburst flood; risk Zhouqu debris flow; barrier dam; dam break; outburst flood; risk
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MDPI and ACS Style

Yang, H.; Chen, G.; Chong, Y.; Jin, J.; Shi, W. Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China. Water 2021, 13, 639. https://doi.org/10.3390/w13050639

AMA Style

Yang H, Chen G, Chong Y, Jin J, Shi W. Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China. Water. 2021; 13(5):639. https://doi.org/10.3390/w13050639

Chicago/Turabian Style

Yang, Heyi, Guan Chen, Yan Chong, Jiacheng Jin, and Wei Shi. 2021. "Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China" Water 13, no. 5: 639. https://doi.org/10.3390/w13050639

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