Research On Low Impact Development And Design Of Park Landscape Based On SWMM Model

With the social and economic development of our country,the urban green space system continues to be occupied with the continuous expansion of urban scale,resulting in a great increase in urban impermeability and destruction of the original hydrological cycle of the city.Urban water problems such as heat island effect,frequent waterlogging and water environment deterioration get increasingly serious.Under this background,the low-impact development(LID)concept emerges at the right moment.By adopting rain water infiltration,storage and purification,the urban hydrological cycle can be restored to its natural state.This paper mainly studies the construction scheme of Hanguang Park from the perspective of landscape planning and design based on the concept of LID.It analyzes the research situation of the LID parks at home and abroad,and establishes the research method and content of the paper;Second,according to the case analysis and interpretation,it expounds the LID design and the key design points of the low-impact development park respectively;Third,taking Hanguang Park in Lianjiang County,Fuzhou City,Fujian Province as the case,it makes an in-depth discussion and research on Hanguang Park from the aspects of overall design,zoning design,LID design,special design.In the low-impact development and design of Hanguang Park,LID facilities are reasonably arranged according to the existing conditions of the study area,which are well connected with the vertical design,landscape detail design and architectural design.In accordance with the characteristics of the site,two different hydrological routes and multiple combinations of LID facilities are designed.The design focuses on infiltration,stagnation,storage,purification,use and drainage,it uses multiple LID facilities in combination to give full play to the advantages of "combination fist".LID facilities mainly adopt green roof,biological detention ponds,constructed wetland,permeable pavement,infiltration canal,rain water garden and plant shallow ditch to improve the hydrological cycle of the study area,so as to realize the benign hydrological cycle of the city and improve the infiltration,storage,purification,utilization and discharge capacity of runoff rain water.Finally,it adopts the SWMM model to evaluate the low-impact development scheme of Hanguang Park from three different aspects to demonstrate the feasibility of the low-impact development and design of Hanguang Park.In the long-term simulation,it is found that the low-impact development design scheme of Huanguang Park can improve the hydrological environment of the park to a great extent and reduce the increase of runoff caused by development.In the short-term simulation,it is found that through low-impact development,the peak flow in Hanguang Park can be greatly reduced,which demonstrates that this scheme has a good effect of runoff control and water flow control.In the simulation of the drainage capacity of the pipe network,it finds that Hanguang Park can effectively improve the site drainage standard and reduce the drainage pressure of the pipe network through low-impact development design.Through studying the low-impact development of Hanguang Park,from the perspective of landscape planning and design,this paper analyzes how to not only solve the contradiction between urban development and water conservation ecology,but also meet the touring needs of tourists for the park.From the view of harmonious symbiosis between man and nature,it makes Hanguang Park give full play to the comprehensive functions of ecology,landscape and culture,and also provides reference for the construction of other low-impact development parks.