湖南省资兴市城市湿地资源网络连通性的生态水文水质效应研究

The Effects of Eco-hydrological and Water Quality of Urban Wetland Resource Impacted by Network Connectivity in Zixing City,Hunan Province

目前,城市湿地水文连通性的科学性问题研究仍然不够充分。为了进一步探讨城市湿地水文连通性的生态水文水质效应,根据湖南资兴城市总体规划的土地利用、湿地的位置与面积、形态设置了4组实验,运用SWMM模型进行水文和水质的模拟研究。结果表明,增加城市湿地间的连通性对于固体悬浮物(SS)、COD、氮磷污染物的减少有积极作用,并且建立植被缓冲带、增设人工湿地等低影响措施可以有效降低城市的地表径流,对于污染物的消减作用较为显著。其中在增加湿地连通性的基础上加入低影响设计方案的生态水文水质效应最优,能够较好地解决城市湿地中的湿地水质问题。

The researches on the scientificity of hydrological connectivity of urban wetlands still have many problems.In order to demonstrate more about the effects of eco-hydrological and water quality impacted by the connectivity of urban wetlands,four experimental schemes were set up according to the land use,location and area of wetlands and the form of the urban planning.SWMM model was used to simulate the effects of hydrological and water quality.The results show that increasing connectivity between urban wetlands has positive effects on the reduction of suspended solids(SS),COD,nitrogen and phosphorus pollutants,and LID measures such as the establishment of vegetation buffer zones and the addition of constructed wetlands can effectively reduce urban surface runoff with the most significant reduction effect on pollutants.Among the four experimental schemes,the best scheme for the effects of eco-hydrological and water quality is that improving the connectivity with LID,which can better solve the water pollution problem in urban wetlands.