Affiliation:
1. School of Geographical Sciences Fujian Normal University Fuzhou Fujian 350007 China fjnu.edu.cn
2. School of Resource Engineering Longyan University Longyan Fujian 364012 China lyun.edu.cn
3. Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China cags.ac.cn
4. China University of Geosciences Beijing 100083 China cug.edu.cn
5. College of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cn
Abstract
Abstract
In the Qinghai-Tibet Plateau, fractures and fault zones have developed in this area, where earthquakes and extreme rainfall frequently induce debris flow disasters, which seriously threaten the safety of the people and properties. In this study, Zhujiagou, Minxian County, Gansu Province in China, has a typical debris flow channel in a small watershed on the northeastern edge of the Qinghai-Tibet Plateau, which has been used as the case study for risk assessment. A debris flow-risk assessment method has been developed in this study. The fusion algorithm of entropy weight and coefficient of variation has been used to evaluate the susceptibility of debris flow in each tributary channel in the watershed. Further, numerical simulation of the debris flow events at the main channel and at the high-prone debris flow tributary channel has been carried out. The “7.18” Zhujiagou debris flow event has been used to verify that the accuracy of the numerical simulation is higher than 74.12%. This method has been applied to design the Zhujiagou debris flow-risk zoning under extreme rainfall conditions, aimed at forming a set of debris flow-risk evaluation system suitable for this type of small watershed. The results show that the peak single-width clear water flow at the mouth of the channel, the length of the channel, and the shallow surface rock formation are the main factors influencing the susceptibility of debris flow. The main tributaries of the watershed are Hagu channel, Zhuling channel, Songshu channel, and Langjia channel which are all high-prone debris flow channels. The Zhujiagou debris flow accumulation fan under the designed 1% rainfall frequency will block the Taohe, which will threaten the safety of the residents and properties near the channel, at the mouth of the channel and in the urban area on the opposite bank of the Taohe. Compared with Hagugou, Zhulinggou, and Songshugou, the low-risk area is Langjiagou. The research results of this study can be used for evaluation methods and as a basis for preventing debris flow disasters on the northeastern edge of the Qinghai-Tibet Plateau.
Funder
National Key R&D Program of China
Longyan City Science and Technology Plan Project
Fujian Province Young and Middle-Aged Teacher Education Research Project
General Project of Fujian Natural Science Foundation
Second Comprehensive Scientific Investigation of the Qinghai-Tibet Plateau
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