基于环境整治视角下海绵城市排水系统优化设计

Optimization Design of Sponge City Drainage System Based on Environmental Remediation

城市排水系统设计的科学与否与城市的安全程度紧密相关,随着社会的快速发展,原有的排水系统大部分都无法适应城市的发展需要,在分析我国内涝灾害的基础上,以江西省莲花县为研究对象,通过建立雨洪模型,分别确定了降雨模型、入渗模型、地表径流模型和排水管渠模型,通过对模型率定确定了水头损失系数、糙率及最大、最小入渗率等参数,分析了LID开发前后城市内涝现状,结果表明:模型模拟值和实测值误差在10%范围之内,LID开发前莲花县现有排水系统无法满足目前降雨径流量、大部分管网已超负荷进行,路面积水严重;进行LID开发后,研究区积水量、积水时间、积水点数明显减少,现状面临的城市内涝情况已明显减缓,但地表径流大时仍会有积水情况出现。研究结论可为我国在"海绵城市"建设中的排水系统优化设计提供参考。

The scientific design of urban drainage system is closely related to the safety of the city. With the rapid development of society, most of the original drainage system can not meet the development needs of the city. Based on the analysis of the disasters in China, this paper taking Lianhua county of Jiangxi province as the research object, by establishing the rainwater model, it is deter- mined that the rainfall model, the infiltration model, the surface runoff model and the drainage pipe model are respectively determined, and the head loss coefficient and roughness are determined by the model rate. The parameters of maximum and minimum infiltration rate were analyzed in the urban area before and after LID development. The results show that the model simulation value and the measured value error are within 10%. The existing drainage system of Lianhua County before LID devel- opment cannot meet the current rainfall runoff. Most of the pipe network has been overloaded, and the road area is seriously watery. After the LID development, the amount of water accumulated, accumu- lated water, and accumulated water in the study area are significantly reduced. The situation in the city is slowed down, but the surface runoff is large. There will still be water accumulation. The re-search conclusions can provide reference for the optimal design of drainage system in China＇s ＂sponge city＂ construction.