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