水资源与水工程学报

文章摘要

马秘，杨云川，黎倩云，周津羽，韦姣崟，廖丽萍，韦钧培.南宁市设计降雨及其总量控制率时空异质性特征Journal of Water Resources and Water Engineering[J].,2022,33(2):35-44

南宁市设计降雨及其总量控制率时空异质性特征

Spatio temporal heterogeneity of the design rainfall and its total amount control rate in Nanning City

DOI：10.11705/j.issn.1672-643X.2022.02.05

英文关键词: sponge city design rainfall annual total rainfall control rate spatial and temporal heterogeneity storage capacity Nanning City

基金项目:国家自然科学基金项目(51609041、41901132)；广西自然科学基金项目(2019GXNSFAA185015)

Author Name	Affiliation
MA Mi¹， YANG Yunchuan^1,2,3,4， LI Qianyun¹， ZHOU Jinyu¹， WEI Jiaoyin¹， LIAO Liping^1,2,3,4， WEI Junpei¹	（1.广西大学土木建筑工程学院，广西南宁 530004； 2.广西岩溶区水安全与智慧调控工程研究中心，广西南宁 530004； 3.广西大学工程防灾与结构安全教育部重点实验室，广西南宁 530004；4.广西防灾减灾与工程安全重点实验室，广西南宁 530004）

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中文摘要:

针对当前我国海绵城市建设及成效考核中设计降雨及其控制率指标单一均化、难以有效定量指导不同下垫面LID设施建设并评价其效果等问题，以南宁市市区为例，基于2020年Quick Bird土地利用及子流域精细划分，根据1981-2010年南宁市0.1°CMFD格点日降雨序列资料，采用ArcGIS空间插值法、《指南》中设计降雨量与控制率关系法以及容积法，分析了研究区日降雨量、设计降雨量及其总量控制率的时空异质性特征，并讨论了现状下垫面调蓄及管网排水对控制率指标的定量影响。结果表明：南宁市市区日降雨频次、年分配、设计降雨量及其控制率均具有显著的时空异质性特征，按75%控制率对应各月的日设计降雨量变化范围为9.72（2月）~32.05 mm（7月）；南宁市主城区（面积占比31.99%）现状年降雨总量控制率普遍低于50%，仅靠绿色LID设施难以实现75%控制率目标，要实现该控制率目标，主城区还需增加调蓄容积120~211 m³/hm²，若考虑管网排水能力70~103 m³/hm²，则所需调蓄容积可减少30~108 m³/hm²。综上，为实现南宁市75%控制率目标，应针对现状下垫面水平，建立考虑时空异质性的不同控制率目标与调蓄容积、管网排水之间的定量函数关系，这是有效提升海绵城市调控雨洪径流能力的一个主要途径。

英文摘要:

The single and unified design rainfall and its control rate indicator are conventionally adopted in the construction and effectiveness evaluation of sponge city in China, which makes it difficult to effectively guide and evaluate the construction of different LID facilities on the underlying surface. In view of this problem, we analyzed the spatio temporal heterogeneity characteristics of daily rainfall, design rainfall and its control rate, and discussed the quantitative influence of the current underlying surface storage and pipe network drainage on the control rate indicator in Nanning urban area using ArcGIS spatial interpolation, design rainfall and control rate relationship method and volume method, based on Quick Bird land use, the fine division of sub basins in 2020 and the Nanning 0.1° CMFD grid daily rainfall series from 1981 to 2010. The results show that the daily rainfall frequency, annual distribution, design rainfall and its control rate of Nanning urban area all showed significant spatial and temporal heterogeneity. The variation range of design rainfall of each month corresponding to 75% control rate was 9.72 (February)-32.05 mm/24h (July); however, the current annual total rainfall control rate of Nanning main urban area (area ratio:31.99%) is generally less than 50%, and it is difficult to achieve the target of 75% control rate only by the contribution of green LID facilities. To obtain the 75% control rate, it is suggested that the storage capacity of the main urban area should be in the range of 120-211 m³/hm²; however, the required storage capacity can be reduced to 30-108 m³/hm² if the drainage capacity of the pipeline network reaches 70-103 m³/hm². In conclusion, in order to achieve the target of 75% control rate of Nanning City, the quantitative function relationship of different control rate targets considering the temporal and spatial differentiation, storage capacity and drainage of pipe network should be established according to the current underlying surface level, which is a main way to effectively improve the rainfall runoff control capacity of sponge city.

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