Debris flow disaster risk analysis and modeling via numerical simulation and land use assessment
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ORIGINAL PAPER
Debris flow disaster risk analysis and modeling via numerical simulation and land use assessment Jun Wang 1,2,3 & Yan Yu 4 & Qinghua Gong 1,2,3 & Shaoxiong Yuan 1,2,3 Received: 2 September 2019 / Accepted: 2 September 2020 / Published online: 17 September 2020 # Saudi Society for Geosciences 2020
Abstract To mitigate the risk of debris flows, quantitative risk assessments for different land use types are quite significant. However, with respect to debris flows, no sound relationship has so far been established between risks and different land use types. This study developed a method of debris flow risk assessment by incorporating numerical simulations with land use types. First, the key debris flow intensities for different return periods, including movement velocities and maximum flow depths, were identified via numerical simulations. Second, a debris flow hazard classification model based on a combination of the debris flow intensity and the return period was established to assess debris flow hazard degree. Then, the land use distribution within the inundated areas was itemized via the interpretation of remote sensing and field surveys, and the debris flow vulnerability was determined by the degree of functional damage or the cost of recovery of land uses caused under a given hazard. Finally, the potential debris flow risk zones were identified and mapped by combining debris flow hazard and vulnerability. The methodology was applied and verified in a small debris flow watershed in China. The proposed methodology can be performed effectively to conduct debris flow risk analysis and can be widely employed for debris flow mitigation. Keywords Debris flow . Inundation simulation . Land use . Risk assessment . Disaster mitigation
Introduction
Highlights (1) Numerical simulations combined with land utilization data to perform debris flow disaster risk analysis and modeling. (2) A debris flow hazard classification model on the basis of a combination of the debris flow intensity and the recurrence period was established. (3) The quantitative relationship between debris flow vulnerability and 12 first-class land use classes. Responsible Editor: Zeynal Abiddin Erguler * Yan Yu [email protected] 1
Guangdong Open Laboratory of Geospatial Information Technology and Application, Guangzhou 510070, China
2
Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou 511458, China
3
Guangzhou Institute of Geography, Guangzhou 510070, China
4
Science and Technology Library of Guangdong Province, Guangdong Institute of Scientific & Technical Information and Development Strategy, Guangzhou 510070, China
Debris flows generally consist of mixtures of water, sediment, wood, and fragmental materials and propagate rapidly along mountain slopes and channels causing serious losses of life and property (Gregoretti et al. 2016). Debris flows have occurred in more than 70 countries around the world and have recently become an important issue (Imaizumi et al. 2006; Dahal et al. 2009; Tecca and Genev
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