RESEARCH ARTICLE


Run-out Effects of Debris Flows Based on Numerical Simulation



Jun Wang1, 2, Yan Yu3, *, Xinfeng Wei4, Qinghua Gong1, 2, Haixian Xiong1, 2
1 Guangdong Open Laboratory of Geospatial Information Technology and Application, Guangzhou 510070, China
2 Guangzhou Institute of Geography, Guangzhou 510070, China
3 Zhanjiang City Housing and Urban Construction Bureau, Zhanjiang, 524076, China
4 China Petroleum Pipeline Engineering Corporation etc., Langfang, 065000, China


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Creative Commons License
© Wang et al.; Licensee Bentham Open

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Zhanjiang City Housing and Urban Construction Bureau, Zhanjiang, 524076, China; Tel/Fax: +86-136-8831-95271; E-mail: yuyan10@mails.ucas.ac.cn


Abstract

Debris flows are a common natural disaster in mountainous areas and often cause severe casualties and property loss. Debris-flow run-out effects analysis can provide an idea of the spatial risks posed to the downstream area of a debris flow, which is extremely important for local populations’ lives, disaster mitigation and planning the layout of economic construction. The objective of this study is to develop a new method to quantify debris flow run-out effects by combining debris flow simulation results and data for different types of land use within the inundated area. After a three-dimensional numerical simulation platform was established, the numerical simulation method was applied as a modeling tool to simulate the inundated areas and final buried depths under rainfalls with different return periods. The simulated result for flow depth under a 100-year return period rainfall event was validated based on field measurements. Finally, the debris-flow run-out effects under different return periods were analyzed by combining the simulation results and land use data. The proposed method can enhance the accuracy of debris-flow spatial risk assessment and has great value for application.

Keywords: Debris flow, Dynamic process, Land use, Numerical simulation, Run-Out effect, Wenchuan earthquake.