| With the development of the concept of sponge city construction,the construction of Rain Water functional green space has gradually become an important way to reduce urban waterlogging disasters.Residential land occupies an important proportion in the overall urban land use,making full use of the internal green space of residential areas for rain and flood management has a strong practical guidance.In view of the fact that the landscape and drainage specialties in the current green space design of urban residential areas have not formed a coupled design process:environmental art,landscape and other majors have more subjective and qualitative treatment of hydrological contents such as spatial identification of rain and flood management,quantitative scale of technical measures,etc.as a result,the ecological management benefit of Rain Water can not be guaranteed.In the process of leading the design,the drainage major often focuses on the construction of Rain Water pipe network while neglecting the content of landscape aesthetics,resulting in the decline of site landscape quality and lack of recreation experience.Based on the perspective of landscape hydrology,this study takes the green space design of urban residential area as the research object,discusses the integration of landscape construction and rain flood management,and forms the collaborative design process of the two parts.First of all,starting from the analysis and design of site functional zoning,topography and other landscape contents,the minimum cumulative resistance model of Rain Water runoff based on "source-sink" path is further constructed to identify and quantify the layout of rain-harvesting green space in the site.the rain flood management space is coupled with the outdoor garden space.Secondly,according to the site hydrological management objectives and landscape design requirements,the linear programming method is adopted,with the site design regulation and storage volume and the hydrological efficiency of rain and flood management measures as the main constraints,and the minimum construction cost as the objective function.The quantitative distribution linear programming model of rain and flood management measures in urban residential areas is established,the scale of rain and flood management measures is optimized,and the hydrological benefits of the decision-making scheme are rechecked with the help of SWMM model.Finally,on the basis of the spatial orientation of rain flood management and the quantitative scale of rain flood management measures,combined with site function utilization,spatial organization transformation,material selection and plant categories,landscape nodes and activity experience,carry on the landscape integration and optimization of hydrological content,coordinate the integration of landscape and hydrology.The demonstration of an example shows that the location of the rain-collecting green space guided by the characteristics of the underlying surface of the site,topographic design and other landscape content,on the basis of ensuring the landscape recreation experience of the site,defines the optimal layout of the rain and flood management site in the community.Based on the quantitative allocation decision of rain and flood management measures based on linear programming,the quantitative allocation of applicable measures under the minimum construction cost is obtained.through the demonstration of SWMM,the total annual runoff control rate of Rain Water is 85.7%,which achieves the goal of site hydrological management.Through landscape design and optimization,Rain Water landscape of urban residential area dominated by green space and oriented to ecological Rain Water management is formed.The empirical study shows that the collaborative design process of landscape and hydrology is effective in the overall planning of urban residential landscape construction and ecological rain and flood management. |
