Catchment-based imperviousness metrics impacts on floods in Niushou River basin, Nanjing City, East China
Catchment-based imperviousness metrics impacts on floods in Niushou River basin, Nanjing City, East China
复制标题
DOI：
10.1007/s11769-017-0861-2
复制
发表时间：
2017-04
影响因子：
3.4
通讯作者：
Weizhong Su;H. Duan
中科院分区：
文献类型：
--
作者：
Weizhong Su;H. Duan
关于城市化对洪水影响的关注逐渐从基于明渠水力学改善的管道末端解决方案转移到不透水性比限制，然后转移到土地使用控制和地方和大规模的综合规划。牛首河流域是南京市城市化进程最快的地区之一，但由于城市用地比例过高，导致了一系列洪涝灾害的发生。本文以流域为单元，结合暴雨管理模型，研究了不同透水率、不同排水方式和不同排水系统对洪泛区的影响。得出了以下结论。1)不透水面的比例或空间特征影响径流量和相关的洪水面积。尽管排水系统完善，但高不透水率，特别是水文敏感区等位置的聚集模式加剧了整个流域的洪水紧张局势。2)局部地区排水水力效率差，局部集水区和较大流域缺乏入渗、产流、蓄流和泄流的整体过程也是重要因素。3)牛首河流域的开发应促进流域由单一的局部、短期的排水过程向集入渗、产蓄、排泄于一体的弹性过程的转化。
Concerns regarding urbanization impacts on floods gradually moved from end-of-pipe solutions, based on open channel hydraulics improvement, to imperviousness ratio limiting and then to land use control and to integrated planning at local and large scale levels. The Niushou River basin is one of the fastest urbanizing areas in Nanjing City, East China, however, the high urban land percentage has leaded to series of flooding events. The paper aims to reveal the impact of imperviousness ratio, patterns and drainage system on flooding areas based on the unit of catchment and Storm Water Management Model (SWMM). The following conclusions were reached. 1) The ratio or spatial characteristics of the impervious surface affected the runoff volumes and associated floods areas. Despite the well-established drainage system, the high imperviousness ratio, particularly clustered pattern in locations such as hydrological sensitive zones aggravated the flooding tension across the basin. 2) The poor drainage hydraulic efficiency in local areas, and the lack of integral processes of infiltration, yield, storage and discharge in local catchment and larger basin are also significant factors. 3) The Niushou River basin development should improve the drainage transformations from a single local, short-term drainage process into integral, elastic processes of infiltration, yield, storage, and discharge.