Analysis of service performance characteristics of debris flow check dams: A case study in Wudu District, Longnan City, Gansu Province

Liang ZHOU; Xiaoying HE; Yunchao JIN; Zhan ZHANG; Lingzhi XIANG; Na SHEN

doi:10.16031/j.cnki.issn.1003-8035.202305019

Volume 34 Issue 6

Dec. 2023

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The Chinese Journal of Geological Hazard and Control > 2023 > 34(6): 37-46. > DOI: 10.16031/j.cnki.issn.1003-8035.202305019

ZHOU Liang，HE Xiaoying，JIN Yunchao，et al. Analysis of service performance characteristics of debris flow check dams: A case study in Wudu District, Longnan City, Gansu Province[J]. The Chinese Journal of Geological Hazard and Control，2023，34(6): 37-46. DOI: 10.16031/j.cnki.issn.1003-8035.202305019

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Analysis of service performance characteristics of debris flow check dams: A case study in Wudu District, Longnan City, Gansu Province

Liang ZHOU^1,,
Xiaoying HE^{1, 2, ,},
Yunchao JIN¹,
Zhan ZHANG¹,
Lingzhi XIANG^{1, 2},
Na SHEN^{1, 2}

1.
Hehai College, Chongqing Jiaotong University, Chongqing　400074, China
2.
Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway, Chongqing　400074, China

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Received Date: May 17, 2023
Revised Date: July 16, 2023
Accepted Date: August 22, 2023
Available Online: August 30, 2023

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Abstract

Abstract

Check dams play a pivotal role in debris flow prevention and control engineering. However, their disaster prevention and mitigation capacity gradually decrease over service time due to repeated debris flow impacts. The study was carried out in 15 ditches and 55 check dams within Wudu District, Longnan City, Gansu Province. Seven key evaluation factors were selected for effectiveness and safety: reservoir siltation ratio, slope stability, drainage hole blockage, dam body damage, dam foundation damage, dam shoulder damage, and safety. The evaluation model of the serviceability of the indivusual dam and the comprehensive serviceability of the single trench of the barrage was established by using hierarchical analysis and fuzzy comprehensive evaluation method, and the serviceability was divided into four grades: excellent, good, medium and poor. The evaluation results show that the serviceability rating of individual dams is predominately "poor", accounting for 34.5%. Similarly, the collective serviceability rating of single trench dams for debris flow is predominately "poor", at 33.3%. The results of the evaluation are consistent with the fieldwork observations, providing a valuable reference for predicting the service performance and service life of barrage dams.
- check dam,
- serviceability evaluation,
- fuzzy comprehensive evaluation method,
- debris flow,
- Wudu District

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Analysis of service performance characteristics of debris flow check dams: A case study in Wudu District, Longnan City, Gansu Province

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