摘要
以唐家山滑坡坝为例,通过分析唐家山滑坡坝及堰塞湖的基本特征,获取溃坝洪水数值模型的输入参数,并根据唐家山滑坡坝的物质组成及地质结构特征对选定的BREACH模型中的竖向冲蚀公式和线型参数Br进行改进。同时应用原模型及改进模型预测唐家山滑坡坝溃坝洪水的峰值流量、峰值段持续时间、总泄洪量等水力学参数,并将两模型的预测值与实际观测值进行对比,结果表明改进模型的预测精度明显提高。对改进模型的主要参数进行敏感性分析,发现坝体物质的孔隙率为最敏感参数。这为类似滑坡坝溃决的水力学参数预测提供了参考。
Taking Tangjiashan landslide dam as an example,the input data of dam break flood numerical model were gotten by analyzing the basic characteristics of the landslide dam and barrier lake.Based on the dam material composition and geological structure characteristics,the vertical erosion formula and linear parameter in BREACH model were improved.Then,the original and improved model were used to predict the hydraulic parameters of Tangjiashan landslide dam break flood,such as peak discharge,duration of peak period,total released-volume and so on.The prediction accuracy between original and improved model was compared.Finally,sensitivity analysis of the key parameters of improved model was carried out.The results show that the prediction accuracy of improved model is obviously enhanced and the porosity of dam material is the most sensitive parameter.It provides a reference for predicting the hydraulic parameters of similar landslide dam break.
作者
李敬
苏爱军
LI Jing;SU Ai-jun(Three Gorges Research Center for Geo-hazards Ministry of Education,China University of Geosicences,Wuhan 430074,Chin)
出处
《水电能源科学》
北大核心
2018年第8期56-59,147,共5页
Water Resources and Power
