摘要
针对南方大多数老城区排涝措施不足、一到汛期就出现积水的问题,为了优选合理经济的排涝措施方案,采用SWMM模型研究某片老城区在不同重现期降雨的影响,分析现有排水管网的排水能力,对超载管道及积水区域提出了两个初步排涝方案。其中方案一为增大溢流段管径20%~50%,方案二为20%汇水面积布设LID措施,模拟结果表明两个方案在降雨重现期P≥10a时,都有部分区域出现积水现象。为此提出两个优化排水方案,即调整溢流区域管径大小、又调整布设LID措施比例的方案。其中方案三将管网管径改造比例调整为方案一的50%,LID措施占研究区域面积比例为方案二的50%;方案四中管网管径改造比例调整为方案一的100%,LID措施占研究区域面积比例为方案二的25%。通过排涝效果和经济效益综合分析,当防涝设计重现期P>20a时,应选择方案三,重LID措施比例、轻管道改造比例;当防涝设计重现期P≤20a时,应选择方案四,重管道改造比例、轻LID措施比例。研究区排水防涝设计标准为30a一遇暴雨不成灾,建议选择方案三。研究成果对选择城市进行管网改造比例和LID措施比例有着一定的借鉴和指导意义,但由于受到其他参考指标的影响,最优比例仍有待深入研究。
The attention should be paid much on drainage measures for the sediment in the flood period of the most old cities in the south.This paper brings up two preliminary proposals for the overloaded pipeline and sediment area,applying for SWMM model to study the impact of different return periods and analyze the drainage capacity system,in order to optimize the economical drainage measures.The first proposal is to increase the diameter of the overflow section by 20%~50%,and the second proposal is to set up the 20%LID measure of the catchment area.The simulation results show that when the rainfall return period is P≥10a,there is some sediment phenomenon.Therefore,two optimized drainage schemes are proposed,which is adjusting the diameter of the overflow area and the proportion of LID measures.The proportion of the pipe network pipe diameter transformation is 50%of the first proposal,and the LID measure accounts for 50%of the proposal 4:the pipe network pipe diameter transformation ratio is 100%of the first proposal and the LID measures account for the proportion of the study area is 25%of the second proposal.Through comprehensive analysis of drainage effect and economic benefit,when P>20a of the third proposal,the measures should focus heavily on LID measure ratio,whileless focusing on pipe transformation ratio;when P≤20a of the forth proposal,the measure should focus heavily on pipeline transformation ratio,while less focusing on LID measure ratio.The design standard for drainage and flood control in this study area is P=30a,when the storm comes but not disaster,then choosing the third proposal.This has certain reference and guiding significance for the proportion of urban network transformation and the proportion of LID measures.However,due to the influence of other reference indicators,the optimal ratio remains to be studied.
作者
卢茜
周冠南
李良松
朱敏
黄宏丽
刘玲
姚慧
LU Xi;ZHOU Guannan;LI Liangsong;ZHU Min;HUANG Hongli;LIU Ling;YAO Hui(Institute of Sponge City Research,Pingxiang University,Pingxiang 337000,Jiangxi,China;China Railway Construction Bridge Engineering Bureau Group 3rd Engineering Co.,Shenyang 337000,Liaoning,China;Jiangxi University of Engineering,Xinyu 338000,Jiangxi,China)
出处
《水利水电技术》
北大核心
2019年第7期13-21,共9页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(21866026)
江西省教育厅科技青年项目(GJJ171144,GJJ181111)
萍乡学院重点项目(2018D0219)
