Research on the optimization model of LID deployment in small scale regions based on GWO-PSO algorithm
[Objective]Sponge city reduces the impact of rainfall related disasters through low impact development(LID)rainwa-ter system,and reasonable LID layout scheme is the decisive factor of development effect.[Methods]The rainstorm flood man-agement model(SWMM)and the gray wolf particle swarm optimization(GWO-PSO)algorithm were coupled to establish a small-scale regional LID optimal deployment model.In the GWO-PSO algorithm,the particles are adjusted based on the social Hierarchy position strategy to obtain better optimization performance.The model completes the automatic calibration of parameters according to the discharge outlet flow,and takes the peak flow as the goal,and the economic cost as the constraint to solve the optimal layout scheme of four LID facilities,namely,rain garden,biological grid,green roof and permeable pavement,which are independent and restrictive.[Results]The model was applied to a pilot community,and under the budget of 1.82 million yuan,the deployment plans under the Return period of 5 a,10 a,20 a and 50 a were obtained.The peak reduction rates were 61.5％,53.2％,42.4％and 31.1％,respectively.[Conclusion]The result indicate that when conducting LID construction in small-scale areas,it is necessary to consider the impact of sub catchment area area.For the road catchment area,it is recommended to connecat with the geographical location for layout.In the low Return period,the regulation effect of each LID facility is good,while in the high Return period,the green roof has the strongest affordability,and needs more budget for peak shaving.
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