Research On Reconstruction And Optimization Of University Campus Landscape Environment Based On Low Impact Development

Since our country introduced college enrollment expansion policy,the rapid development of higher education has got into the unprecedented expansion stage.During this period,new university campuses locate far away from downtown district,cover a huge area,lack of detailed construction and excessive change of the original natural environment.The construction of artificial disturbs natural hydrological processes,causing problems of drought and flood.In this context,the concept of low-impact development(LID)needs to be introduced into university campuses.This work analyzes the theoretical research and practical work of campus LID at home and abroad,and summarizes the guiding principles and planning along with design strategies of campus low-impact development.On this basis,this paper studies the planning and design methods.Firstly,on the basis of analyzing the current conditions of the campus,a model of campus production and confluence is built based on SWMM and Civil 3D＿SSA dual-platform verification technology,and the hydrological simulation results of the dual-platform are verified and compared.Secondly,the LID landscape planning and design of the campus are carried out to build a perfect hydrological spatial pattern of the campus,combined with landscape environment elements such as terrain to improve the quality of the campus landscape environment.Finally,SWMM software is used to compare and verify the stormwater runoff after campus development.This study takes Jiulong Lake Campus of Southeast University as an example and conclusions are as follows:(1)Through the dual-platform test of SWMM and Civil 3D＿SSA,the weak rainwater evaporation and infiltration capacity of catchment areas with high impermeability ratio in campus environment was proved,along with large rainwater runoff.The rainwater runoff of the same catchment area increases with the increase of rainfall return period.(2)The reason for the drought and flood problems in the traditional campus is that the artificial construction of the campus destroys the natural ecological space of the original site,obstructs the original rainwater confluence channel,occupies the permeable underlying surface and the rainwater storage space.At the same time,the lack of ecological compensation measures leads to waterlogging in many parts of the campus.(3)After the LID landscape environment optimization and transformation of the Jiulong Lake campus of Southeast University,the rainwater runoff was significantly improved,and the degree of improvement weakened with the increase of the rainfall return period.It was obvious in the case that rainfall lasted 3 hours and the rainfall return period was 1 year,in which the surface runoff was reduced by 50%,and the peak flow rate was reduced by 42.8%;in a rainfall event with a return period of 5 years,the surface runoff was reduced by 39.4%,and the peak flow rate was reduced by 44.7%;in a rainfall event with a return period of 10 years,the surface runoff decreased by 38.7% and the peak flow rate decreased by 42.6%;in a rainfall event with a return period of 50 years,the surface runoff decreased by 24.1% and the peak flow rate decreased by 29.8%.