Suitability Evaluation And Landscape Optimization Of Sponging Construction Of Qinglong Lake Wetland Park In Chengdu

In the process of rapid urbanization in China,unreasonable planning and construction have aggravated many problems,such as urban flooding,urban water shortage and ecological function reduction.With the development of the concept of low impact development,the idea of "sponge city" is closely related to the process of urban development.As the largest natural sponge in the city,Wetland Park can regulate urban rainwater,promote urban rainwater recycling and alleviate urban heat island effects,which gives consideration to many functions of purification,landscape and ecology.The sponge construction of Wetland Park is on account of maintaining the stability of ecological basement,and the improvement of carrying capacity and rainwater storage capacity is taken as the construction content.It is accomplished through ecological construction of revetment,runoff pollution control,plant allocation optimization and ecological hydrological restoration.In this study,Qinglong Lake Wetland Park in Chengdu was chosen as the research object,evaluated and analyzed its suitability for sponge construction,and optimized its reconstruction through landscape architecture approaches.The purpose was to understand the sponge construction situation of Qinglong Lake Wetland Park,identified the current construction problems,and explored ways to rationally enhance the suitability of sponge construction,which was conducive to tapping the ecological potential of Qinglong Lake Wetland Park and enhancing its ecological service value.First of all,based on remote sensing data,this paper obtained the basic data of elevation,slope,runoff concentration,ecological suitability,water buffer and water ecological sensitivity by using GIS technology,then analyzed above single factor.After normalization of each single factor,superposition analysis was carried out to reclassify the suitability values obtained after superposition.According to the numerical value,the suitability values of the study area were reclassified into three categories: sponge construction protection zone,sponge construction buffer zone and sponge construction development zone.In the light of the evaluation results,the following problems were identified:(1)The vegetation level of the water-facing revetment at the entrance and exit of the study area are poor,and shoreline around the reservoir is not ecological enough;(2)the hydrophilic plots are not properly maintained;(3)the layout of technical measures is unreasonable;(4)There are many unused green spaces in the park,other problems such as the insufficient utilization rate of green space,the barren lawn,and the poor vegetation around Dongfeng River are apparent;(5)the water quality in some waters is polluted,and the scattered environment of small ponds is poor;(6)the parking lot construction has room for improvement.Ultimately,the Qinglong Lake Wetland Park was optimized in many aspects,such as roads,green space,green roof,waterfront revetment,water purification and pollution control device and parking lot.The layout of technical measures adopted the form of combination to increase the proportion of permeable pavement and ecological revetment,so as to enhance the rainwater infiltration capacity per unit area.Beginning with the landscape used of terrestrial plants,wet plants and aquatic plants,the allocation of regional plants was optimized and the types of vegetation were increased.In addition,the design of road,green space and revetment was based on the current situation construction.Adding appropriate technical measures of sponge construction,optimizing the sponge in the park could give full play to the rainwater storage function of the wetland park.After the optimization and transformation,all areas need to be monitored and maintained later.At the same time,the landscape and ecological benefits of study area were limited as a city park.Flexible management was one of the ways to enhance and maximize the benefits.Improving the landscape and ecological functions of the study area could contribute to providing some references for the construction of Wetland Park in the Eco-District around Chengdu,which was conducive to the construction of Chengdu sponge city.