水资源与水工程学报2017，Vol.28Issue(6)：134-138,5.DOI:10.11705/j.issn.1672-643X.2017.06.23
基于FLO-2D的泥石流危险性评价 ——以四川省汶川县绵虒镇簇头沟为例
Assessment on the hazard of debris flow based on FLO-2D:A case study of debris flow in Cutou Gully, Wenchuan, Sichuan
摘要
Abstract
Debris flow at a rainfall frequency of 2％ was triggered by rainstorm on July 10 , 2013 in Mian-si town, Wenchuan County, Sichuan Province, blocking Minjiang River and endangering the settled pop-ulation downstream area. Based on the 1: 10000 contour, rainfall data and remote sensing image of 2013 and the flied investigation in Cutou gully, FLO-2D software is used to simulate the movement and accu-mulation process of debris flow under different rainfall frequency ( 5％, 2％ and 1％) for studying the hazard of debris flow in Cutou gully. Under the condition of 2％ rainfall frequency( the actual rainfall fre-quency), the simulated maximum debris flow velocity is 12. 99m/s and the maximum debris flow mud depth is 15. 7m, and the accumulation area is 9. 55 × 104 m2 . Verified by the actual accumulation zone, the accuracy rate was 77％. The simulation results are in a reasonable error range and show high reliabil-ity. The strength model of debris flow was created through the mud depth and flow velocity. In addition, the debris flow hazard assessment model is constructed by combining the strength of debris flow and the return period of the outbreak. In this way, the risk assessment of debris flow in Cutou gully is realized and the distribution map of hazard zone in fan area is obtained, where the high dangerous area accounts for 61％, the moderate dangerous area accounts for 19％, and the low risk area accounts for 20％. It provides a scientific reference for prevention and control of Cutou gully debris flow.关键词
泥石流/FLO-2D/数值模拟/危险性评价/汶川县簇头沟Key words
debris flow/FLO -2 D/numerical simulation/hazard assessment/Cutou Gully of Wen-chuan County分类
天文与地球科学引用本文复制引用
龚柯,杨涛,夏晨皓,杨宇..基于FLO-2D的泥石流危险性评价 ——以四川省汶川县绵虒镇簇头沟为例[J].水资源与水工程学报,2017,28(6):134-138,5.基金项目
国家自然科学基金项目(41672299) （41672299）
