Study On Strategy Of Majiagou Riverside Reconstruction In Harbin Based On Ecological Perspective

Urban river is closely related to urban development and construction.As the city's blue infrastructure,urban river carries a variety of important functions.At present,many of China's urban rivers are facing serious problems and challenges.Especially in winter cities,problems such as river channelization,hardening pollution,loss of biodiversity,and poor quality of the public space have obtained increasing attention.At the present stage,the main goal of urban river reconstruction still remains flood control and drainage.The research scope is often confined to the river scale,and it is lack of comprehensive analysis of the river basin from macro perspective.In recent years,with the increasingly prominent flood disaster problems in China's major cities,low impact development and sponge city construction in full swing.More and more attention has been paid to the ecological reconstruction of urban river.This paper takes Harbin Majiagou riverside as the research object,and discusses the methods and strategies of the ecological reconstruction.Firstly,through literature review,summarizes the domestic and foreign city urban river development and practical case study.Then carry out the on-site investigation along Majiagou riverside,and analyze the soil,vegetation,water,animal and surrounding land.Use Arc GIS and Fragstsats to carry out the figure-ground relationship analysis and rain footprint analysis of Majiagou River.Compare Majiagou River with other rivers which ecological condition is better in winter cities in the world,to study the existing problems and shortcomings of Majiagou River.The research put forward 4 reconstruction principles,including overall systematic,natural ecology,biodiversity,adaptability to cold,and then put forward specific planning strategy of 3 levels: macro,medium and micro.On the macro level,starting from the basin scale,control and restraint the surrounding elements in Majiagou River along the range of 200-300 m,which have great impact on the river ecosystem such as land,buildings,roads and other,to maintain the Majiagou River surrounding environment as healthy and sustainable ecological base and landscape pattern.On the medium level,Starting from the river corridor,the main goal is to build up 5 systems of Majiagou river,including ecological revetment system and climate protection system,open space system,landscape system,to form Majiagou river ecosystem,which is healthy,full of species,comfortable.On the macro level,the detailed design of Majiagou river of small scale is proposed,including ecological revetment design,planting design,rain and snow collection design,artificial wetland and ecological floating island design,biodiversity design,water groove design,river landscape design etc,to provide design strategies of ecological reconstruction for the important nodes.Finally,aiming at the problem of how to implement the proposed reconstruction strategies along Majiagou riverside,the reasearch put forward the method of implementation,installment plan and management measures,in order to provide operational guidance and reference for the ecological planning along Majiagou River,and promote the idea of "dancing with the river,symbiosis between river and city".