1.Cangzhou hydrology and Water Resources Survey Bureau of Hebei Province;2.State Key Laboratory of hydraulic engineering simulation and safety
洪涝灾害是最常见的自然灾害之一,洪水模拟预测是防洪减灾的重要措施。以河北省邢台市柳林流域为研究区域,通过HEC-GeoHMS模块处理30 M、90 M、1 KM精度DEM数据,构建相应的HEC-HMS模型,对柳林流域选取的19场洪水进行模拟,对比分析不同地形精度对洪水模拟的影响,以探索不同分辨率模型在柳林流域洪水模拟的适用性。由研究结果可知：30M、90M、1KM精度模型洪峰洪量合格率分别为68.4%、42.1%、26.3%；径流量合格率分别为78.9%、68.4%、68.4%；纳什效率系数均值为0.59、0.57、0.46,30M精度模型更适合用来进行柳林流域洪水模拟。由研究结果可知：30M、90M、1KM精度模型洪峰洪量合格率分别为68.4%、42.1%、26.3%。
flood disaster is one of the most common natural disasters. Flood simulation and prediction is an important measure for flood control and disaster reduction. Taking Liulin watershed in Xingtai City, Hebei Province as the research area, this paper processes DEM data with 30m, 90m and 1km accuracy through HEC geohms module, constructs the corresponding HEC-HMS model, simulates 19 floods selected in Liulin watershed, compares and analyzes the impact of different terrain accuracy on flood simulation, so as to explore the applicability of different resolution models in Liulin watershed flood simulation. According to the research results, the qualified rates of peak flood volume of 30m, 90m and 1km precision models are 68.4%, 42.1% and 26.3% respectively; The qualified rates of runoff were 78.9%, 68.4% and 68.4% respectively; The mean value of Nash efficiency coefficient is 0.59, 0.57 and 0.46. The 30m precision model is more suitable for flood simulation in Liulin basin.