中国中小流域地区洪水灾害频发，探究新型城市雨洪模型是当下的研究热点。通过耦合水文模型与二维水动力模型的方法，使得在模拟城市下垫面洪水淹没情况的同时，又能使模拟达到较快的运算速度。以泉州市梅溪流域为例，探究耦合模型在中国中小流域范围应用的可行性。结果表明，耦合模型模拟水量平衡误差极小，淹没水深结果与验证值吻合较好。根据对淹没水深图与达最大水深时间图的分析，得到区域范围洪水的空间分布及时间分布，可为中小流域洪水治理提供决策支持。但中小流域水文数据匮乏一定程度上限制了模型的可靠性。

As frequent flood disasters occurring in small and medium watersheds of China,exploring new type of urban rainfall runoff model is a hotspot in the current researches. By coupling hydrologic model with hydrodynamic model,urban flood inundation may be simulated at an improved computing speed.Meixi basin is taken as an case study area to explore the applicability of the coupled model in small and medium watersheds of China. The study results show that inundation depth is basically consistent with verification value,with no possibility of error due to water balance calculation.By analyzing inundation depth map and time to maximum depth,spatial distribution and temporal distribution of regional flood disaster can be obtained to support decision-making for flood management in small and medium watersheds. But the reliability of the model may be questioned to a certain extent owing to lack in hydrologic data of small and medium watersheds.

国家重点研发计划(2016YFC0401308)；国家自然科学基金（51779007）；北京市朝阳区博士后工作经费资助项目