Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China
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 flood...
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doaj-fb859f0f5ae04ce29ad4eb9a36a0047d2021-02-28T00:04:48ZengMDPI AGWater2073-44412021-02-011363963910.3390/w13050639Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western ChinaHeyi Yang0Wei Shi1Guan Chen2Jiacheng Jin3Yan Chong4MOE Key Laboratory of Western China’s Environmental Systems, School of Earth Sciences, Lanzhou University, Lanzhou 730000, ChinaMOE Key Laboratory of Western China’s Environmental Systems, School of Earth Sciences, Lanzhou University, Lanzhou 730000, ChinaMOE Key Laboratory of Western China’s Environmental Systems, School of Earth Sciences, Lanzhou University, Lanzhou 730000, ChinaMOE Key Laboratory of Western China’s Environmental Systems, School of Earth Sciences, Lanzhou University, Lanzhou 730000, ChinaTechnology & Innovation Centre for Environmental Geology and Geohazards Prevention, School of Earth Sciences, Lanzhou University, Lanzhou 730000, ChinaIn 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 m<sup>3</sup>/s, which was consistent with the actual discharge of 316 m<sup>3</sup>/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.https://www.mdpi.com/2073-4441/13/5/639Zhouqu debris flowbarrier damdam breakoutburst floodrisk |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Heyi Yang Wei Shi Guan Chen Jiacheng Jin Yan Chong |
spellingShingle |
Heyi Yang Wei Shi Guan Chen Jiacheng Jin Yan Chong Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China Water Zhouqu debris flow barrier dam dam break outburst flood risk |
author_facet |
Heyi Yang Wei Shi Guan Chen Jiacheng Jin Yan Chong |
author_sort |
Heyi Yang |
title |
Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China |
title_short |
Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China |
title_full |
Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China |
title_fullStr |
Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China |
title_full_unstemmed |
Quantitative Prediction of Outburst Flood Hazard of the Zhouqu “8.8” Debris Flow-Barrier Dam in Western China |
title_sort |
quantitative prediction of outburst flood hazard of the zhouqu “8.8” debris flow-barrier dam in western china |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2021-02-01 |
description |
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 m<sup>3</sup>/s, which was consistent with the actual discharge of 316 m<sup>3</sup>/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. |
topic |
Zhouqu debris flow barrier dam dam break outburst flood risk |
url |
https://www.mdpi.com/2073-4441/13/5/639 |
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