小城镇低影响开发雨洪控制效果模拟

选择山东营丘镇区为研究对象,运用SWMM软件结合镇区地形地势和土地利用现状对研究区域进行合理概化,参考潍坊市暴雨强度公式设计降雨模型,完成对确定及不确定性参数的设定,并基于径流系数法对不确定性参数进行校准,最后利用多场降雨对校准后的理想解集进行稳定性验证。同时,结合研究区所布设的低影响开发雨水综合蓄集利用系统,完成对其低影响开发(LID)措施参数的设定,最终实现对研究区在不同重现期(1a、3a、10a)下有无LID设施时的水量及水质情况的模拟。结果表明,LID措施对径流总量、径流系数、峰现时间、峰值流量和TSS排放负荷等方面的控制效果显著,且LID措施在重现期较小的降雨情景中对地表径流的滞纳效果更明显。

Simulation of control effect of rainfall and flood in low impact development of small towns

Taking Ying qiu Tow n of Shandong Pro vince as the research object, t he SWM M so ftwa re was used to combine the to2 pog raphy and land use status of the township to r ationalize the study ar ea. The r ainfall mo del w as desig ned accor ding to the rainstorm intensity fo rmula of Weifang City, and by com pleting the setting of the determined and uncertain parameters. T he model was calibrated by the uncertain par ameters based o n the runo ff coefficient method. . Finally , the stabilit y of the calibrated ideal solution set w as verified by using multiple fields o f rainfall. Simultaneously , the low2impact development o f the integ rated rainw ater stor age and utilizatio n sy st em w ere combined in the study area. The par ameters of low2 impact develo pment measur es ( LID) w ere set, and finally, the simulation of w ater quantity and quality in the study ar ea w it h o r w ithout low2impact develop2 ment facilities in different retur n periods ( one year, three years, ten y ears) w ere completed. The results showed that LID meas2 ures have significant contro l effects on total runo ff, r unoff coefficient, peak time, peak discharg e and TSS dischar ge lo ad. Mor eo2 v er, t he effect of LID measures o n surface runoff delay was mo re obvio us in r ainfall scenario s w ith smaller rainfall retur n period.