根据山洪灾害防治项目要求,重点开展了城镇区域的洪水影响及淹没分析研究,选择湖北省保康县作为典型山区城镇开展实例研究。通过对保康县的实地查勘,资料收集,设计洪水计算方案,建立水动力学模型、洪水演进分析模型、洪水淹没分析模型;并以100 a一遇设计洪水为例,对城区受淹地区及其淹没水深、淹没面积等进行了分析。结果表明,该方法具备良好的理论基础,有效实现一维、二维模型嵌套,计算速度快,能够取得精准、合理可靠的洪水影响分析成果和洪水淹没成果,可为防汛决策部门提供参考。

According to the requirement of mountain flood prevention project,we conducted research on flood impact and inundation of urban area.Baokang county in Hubei Province was selected as a typical mountainous county for case study.Through field investigation and data collection,we designed flood calculation schemes,and built hydrodynamics model,flood routing model and flood inundation model.The calculation results reveal that the method has good theoretical basis,fast calculation speed and accurate calculation results.Moreover,two-dimensional model nesting and rational and reliable flood impact analysis are carried out in this paper.The research results can provide valuable reference for flood control decision-making departments.