Abstract
Numerous collapses and landslides caused by the Wenchuan earthquake provide abundant loose materials for a large number of debris flows that occurred after the earthquake. Most of the check dams were silted or damaged by debris flow due to the increased volume of materials after the earthquake. Taking the debris flows in the Qinglin Basin in China as a case study, 43 sets of numerical simulations of debris flow with different probabilities of occurrence and different facility combinations were performed to obtain the submerged range, velocity, and mud depth of debris flow in the residential area. The total risk of the residential area is calculated on the basis of the risk of a single building according to the vulnerability of the property and population and combined with the depth and velocity of debris flow. According to the change in risk in the residential area under different facility combinations, a novel method of quantitative evaluation of the benefits of facilities for disaster mitigation based on risk reduction per unit height of facility (RRPH) has been proposed. According to the result of the analysis, the method can quantify the benefits of disaster reduction by different facilities, analyze whether existing facilities meet disaster mitigation goals, and determine the optimal facility height, facility combination, or existing facilities improvement and optimization scheme.
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Acknowledgements
The authors would like to acknowledge the assistance of prof. Xiaoyi Fan of the Southwest Petroleum University, who has provided ongoing assistance over the past ten years during our numerous field trips to the Wenchuan earthquake zone. The authors would also like to express their sincere gratitude to prof. Chaojun Ouyang from the Institute of Mountain Hazards and Environment, the Chinese Academy of Sciences, and the Ministry of Water Conservancy, for Massflow support.
Funding
This research was supported by the Natural Science Foundation of China (Project No. 41971214 and 41877524).
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Tian, S., Zhang, J., Shi, B. et al. Evaluation of the benefits of facility for disaster mitigation based on the risk of debris flow. Landslides 19, 85–97 (2022). https://doi.org/10.1007/s10346-021-01776-5
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DOI: https://doi.org/10.1007/s10346-021-01776-5