基于FLO-2D的泥石流工程治理效果分析——以都江堰银洞子沟泥石流为例

Analysis of engineering treatment effect of debris flow based on FLO-2D:case of Yindongzi gully in Dujiangyan City

选取地震区典型泥石流沟银洞子沟作为研究对象,运用FLO-2D软件再现该沟2013年泥石流发生过程,验证了通过研究区雨量数据获取泥石流流量线方法的可靠性以及相关模拟参数选取的合理性。在此基础上,基于泥石流发生频率和暴雨爆发频率相同的假设,对不同爆发频率下的泥石流工程治理效果进行了分析。结果表明:工程治理后,当爆发频率为30,50 a时,工程治理效果显著;当爆发频率为100 a时,工程治理效果不显著。因此,建议相关管理部门加强极端降雨条件下泥石流的预警和防治工作。

Taking the typical debris flow gully, Yindongzi gully in earthquake zone, as an example, FLO - 2D software was used to reproduce the process of the debris flow in 2013, which proved the validity of the debris flow discharge hydrograph by rainfall data in the study area and the rationality of related FLO - 2D modeling parameters. Based on this and the assumption that the debris flow and rainstorm has the same occurrence frequency, we simulated the engineering treatment effect of debris flow of different frequency by FLO - 2D model. The simulation results show that when the burst frequency is 30 or 50 years, the engi-neering treatment effect is remarkable; when the burst f r e q u e n c y is 1 0 0 years, the engineering treatment effect is limited. T h ere-fore ,it is suggested that the relevant management departments should strengthen the prevention and control of debris flow under extreme rainfall conditions.