关键词: NWS BREACH模型, 唐家山堰塞坝, 泄流模拟, 敏感性分析

Abstract:

NWS BREACH model is the most prevalent mathematic model for simulating overtopping and piping failure of earth-rock dam and barrier dam at home and abroad. Based on the measured data of Tangjiashan barrier dam, a mathematical model simulating the overtopping discharge process is put forward, and its rationality is validated through the monitored data of flow hydrograph and variation of water level. Sensitivity analysis of the pivotal parameters is carried out, the influence on calculation results from the variation of mean diameter, erodibility and downstream slope ratio is studied, it is demonstrated that the erodibility and downstream slope ratio have significant influence on the discharge process. The research results have guiding significance for risk elimination and flood risk assessment of barrier dams.

Key words: NWS BREACH model, Tangjiashan barrier dam, discharge simulation, sensitivity analysis