Susceptibility assessment of debris flow based on watershed units in Kangding City, Sichuan Province

Feng WANG; Fan YANG; Zhongrong JIANG; E WU; Guan WANG

doi:10.16031/j.cnki.issn.1003-8035.202205038

Volume 34 Issue 3

Jun. 2023

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The Chinese Journal of Geological Hazard and Control > 2023 > 34(3): 145-156. > DOI: 10.16031/j.cnki.issn.1003-8035.202205038

WANG Feng，YANG Fan，JIANG Zhongrong，et al. Susceptibility assessment of debris flow based on watershed units in Kangding City, Sichuan Province[J]. The Chinese Journal of Geological Hazard and Control，2023，34(3): 145-156. DOI: 10.16031/j.cnki.issn.1003-8035.202205038

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Susceptibility assessment of debris flow based on watershed units in Kangding City, Sichuan Province

Feng WANG^{1, 2, 3,},
Fan YANG^{1, 2, 3},
Zhongrong JIANG^{1, 2, 3},
E WU^{1, 2, 3},
Guan WANG^{1, 2, 3}

1.
Sichuan Geological Environment Survey and Research Center, Chengdu, Sichuan　610081, China
2.
Sichuan Huadi Building Engineering Co. Ltd., Chengdu, Sichuan　610081, China
3.
Sichuan Province Engineering Technology Research Center of Geohazard Prevention, Chengdu, Sichuan　610081, China

Funds: Huadi Construction Project Incorporated Company, Chengdu ,Sichuan 610081, China;

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Received Date: May 24, 2022
Revised Date: August 17, 2022
Available Online: June 05, 2023

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Abstract

Abstract

To study the susceptibility of debris flow in Kangding City, the study area was divided into 421 watershed units. Spatial analysis tools in ArcGIS software and SPSS software were used to analyze the internal superposition of evaluation indicators and the correlation between evaluation indicators and debris flows disasters. By screening out the evaluation factors with a high degree of overlap and poor correlation, eight evaluation factors were selected for debris flow susceptibility assessment. These included watershed unit area, melton rate, form factor ratio, collapse and landslides density of catchment, average fractional vegetation cover of catchment, road density of catchment, average stream power index of catchment, and average rainfall during the multi-year flood season. The susceptibility of debris flow was quantitatively evaluated by combining the information value model and the entropy method. The weights of the evaluation indicators were quantitatively determined by the entropy method, and the evaluation factor weighted information quantity value was calculated. Based on this, the debris flow susceptibility in Kangding City was divided into four grades: extremely high, high, medium and low. The results of debris flow susceptibility assessment were tested using the frequency ratio model and the Receiver-Operating Characteristic (ROC) curve, with an AUC curve of 0.842, indicating high accuracy of the evaluation model.
- debris flow,
- susceptibility assessment,
- Kangding City,
- watershed unit,
- information value

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References

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Susceptibility assessment of debris flow based on watershed units in Kangding City, Sichuan Province

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