[1]曾向红,蒋元华,杨清清,等.降雨事件间隔时间对海绵城市规划设计的影响[J].中国给水排水,2020,36(21):102-109.
　ZENG Xiang-hong,JIANG Yuan-hua,YANG Qing-qing,et al.Effect of Rainfall Inter-event Time Definition on Sponge City Planning and Design[J].China Water & Wastewater,2020,36(21):102-109.
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降雨事件间隔时间对海绵城市规划设计的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第36卷 期数: 2020年第21期 页码: 102-109 栏目: 出版日期: 2020-11-01
Title:
Effect of Rainfall Inter-event Time Definition on Sponge City Planning and Design
作者:
曾向红1,2，蒋元华1,2，杨清清3，佘年3，吴浩1,2，廖玉芳1,4，段丽洁1,2，杜东升1,4
(1.气象防灾减灾湖南省重点实验室，湖南长沙410118；2.湖南省气候中心，湖南长沙410118；3.中机国际工程设计研究院有限责任公司，湖南长沙410007；4.湖南省气象科学研究所，湖南长沙410118)
Author(s):
ZENG Xiang-hong1,2,JIANG Yuan-hua1,2,YANG Qing-qing3,SHE Nian3,WU Hao1,2,LIAO Yu-fang1,4,DUAN Li-jie1,2,DU Dong-sheng1,4
(1. Key Laboratory of Meteorological Disaster Prevention and Mitigation in Hunan Province, Changsha 410118, China; 2. Hunan Climate Center, Changsha 410118, China; 3. China Machinery International Engineering Design & Research Institute Co. Ltd.， Changsha 410007, China; 4. Hunan Institute of Meteorological Sciences, Changsha 410118, China)
关键词:
降雨事件间隔时间; 气象特征; 流域水文特征; 海绵城市
Keywords:
rainfall inter-event time definition; meteorological characteristics; watershed hydrological characteristics; sponge city
摘要:
目前海绵城市规划和设计采用的降雨事件间隔时间（IETD）是根据城市排水管渠设计的5~120 min降雨历时中的上限值，没有考虑到海绵城市的渗滞蓄功能，对海绵城市的规划、设计和工程应用具有一定的局限性。为此，从城市流域角度出发，采用耦合气象特征和流域水文特征的分析方法，将IETD定义为降雨结束到流域径流结束的时间，此定义不仅考虑了城市流域的自然特征，也考虑了海绵城市的功能，因此适用于大多数城市。以长沙市为例，通过1990年—2017年逐分钟降雨资料分析及两个具有代表性的行政区水文模拟，得出以下结果：IETD与汇水区面积显著相关，同时也受下垫面不透水率、坡度等其他因素影响，汇水区的IETD中值为4 h。考虑到海绵城市规划设计大多数以汇水分区为单元，因此，长沙市的IETD取4 h较为合理。最后采用4 h的IETD对暴雨雨型进行设计，其结果与目前使用2 h的IETD暴雨雨型相比，雨峰位置明显提前。
Abstract:
At present, rainfall inter-event time definition (IETD) adopted in sponge city planning and design is the upper limit of the rainfall duration (5-120 min) according to the design of urban drainage pipes and canals, which does not take into account the infiltration, retention and storage function of sponge city, and has certain limitation on planning, design and engineering application of sponge city. Therefore, an analysis method of coupling meteorological features and watershed hydrological characteristics from the perspective of urban basin was proposed, and IETD was defined as the time from the end of rainfall to the end of the runoff of the basin. This definition not only took into account the natural characteristics of urban watersheds, but also the functions of sponge city, which was thus applicable to most cities. The rainfall data of Changsha from 1990 to 2017 was analyzed and hydrologic simulation of two representative districts were carried out. IETD was significantly related to the catchment area, and was also affected by other factors such as impervious ratio and slope of the underlying surface. The median IETD of the catchment area was 4 h. Since most sponge cities planning and design were focused on catchment unit scale, therefore, it was reasonable to determine IETD of 4 hours in Changsha. Finally, the 4-hour IETD was applied to design a storm event. The results showed that the peak of the IETD rainstorm appeared significantly earlier than that of 2-hour IETD rainstorm.
更新日期/Last Update: 2020-11-01