Waterscape Design Based On Water Self-purification In Wetland Parks

This paper sorts out literature materials related to self-purification of water body and water body landscape design,and summarizes the connotation,realization mode,influencing factors and other relevant theories of self-purification of water body,and analyzes the influence of water body landscape design on self-purification of water body function and the composition,classification and design essentials of water body landscape,studies the factors that can affect self-purification of water body ability in water body landscape design points,and sums up the factors that can enhance of water body landscape design of water body capability.The main results of this study are as follows:(1)The influence of water body landscape on self-purification of water body process can be studied from two aspects: the influence on the hydrological characteristics of water body and the influence on internal and external aquatic environment.Among them,the change of water body landscape has the most obvious effect on the physical and biological self-purification process.When designing the water body landscape,the designer should not only refer to the creation of the landscape itself,but also involve the overall water ecological environment comprehensively.(2)As far as graphic characters are concerned,the morphology of water body used in,water body landscape can be divided into three types: point shape,line shape and surface shape.Based on the influence of water body landscape on self-purification of water body function,the author proposes a water body landscape design scheme which can enhance the ability of selfpurification of water body from four aspects: graphic design,vertical design,barge and bottom texture design and aquatic plant construction.(3)This paper concretizes the design concept and design method,studies the case design of water body landscape design of wetland ecological tourism and leisure area in Xixi national wetland park in Hangzhou and applies it in the renovation plan of wetland park.A.Graphic design: Controlling the water surface scale and ensuring the water area scale can meet the survival of a complete aquatic community,increase the proportion of surface water and linear water,and ensure that the linear water belongs to the medium and high winding water body with bending degree > 1.2 to improve the habitat and biodiversity of the water environment.Moreover,it is imperative to focus on the combination of regional units,integrate the water body in the form of``dot line surface’’ to make each part play a different purification function;B.Vertical design: The water depth is set according to the needs of aquatic plants and the flow rate is controlled by shaping the bottom slope.Water bodies with different depths are set to meet the survival needs of different plants and animals and achieve different types of selfpurification.Combined with the arrangement of "deep pool,jet stream and shoal",selfpurification of water body is strengthened,the natural gentle slope form is used to provide suitable conditions for the growth of aquatic plants.C.Texture design: It uses ecological barge,natural stone and plant planting to fix soil and protect shore,which can provide higher ecological benefit and natural landscape effect,which is beneficial to the survival of animals and plants in water environment and will not hinder the internal and external circulation of water body.On the basis of the original site conditions,the water body’s bottom surface is mainly composed of soil,silt,sand and gravel,combined with different basement topography and plane morphology,and utilizes different bottom surface materials with different roughness to create living space for benthic organisms.D.Plant configuration: It should choose strong vitality,biomass,easy to maintenance and purification ability of local wetland plant,according to the different partition of water depth,water and the bottom surface texture decorate plants group,through enrichment plant,adsorption,and other life activities to strengthen water self-purification efficiency.At the same time,it shall combine with the concrete surface morphology of landscape space created by different plant configuration in a specific manner to improve the wetland landscape value.