Research On The Construction Mode Of Ecological Landscape In Hainan Island Under The Concept Of "Sponge City"

The current sponge city construction mode is a top-down system,which is promoted from the central government to the local government.It guides the urban planning and design at different levels by making indicators and decomposing them layer by layer.However,different guidance for different regions needs to be considered.There are different natural bases in different regions.In the six word policy of sponge construction,we should focus on different aspects and adopt different coupling modes of infrastructure according to the current situation of construction.This paper takes Hainan Province as a reference to explore the construction mode and path of different regions.Refer to the construction of urban green space and infrastructure in the construction of "sponge city" to optimize the construction model and path of urban ecological landscape.For the existing top-down sponge city construction system,supplement the bottom-up system construction model based on the analysis of natural base conditions.The subject conducts research from the following aspects.First,through a large number of field investigations,the current status of green land construction in cities and counties in Hainan Province is summarized;second,through the calculation of soil field water holding capacity,the nature of the region itself is combined with climate data such as water surplus and deficit to comprehensively define the natural construction base of the region;For the coupling between the current urban green space construction and the natural base,summarize the construction mode under different circumstances,and "synergistically couple" several sponge measures.Studies have shown that under the relationship that the overall water deficit in the region is less than the soil water holding capacity,for Haikou and near-high areas where the water deficit is small but the soil water holding capacity is large,and the rainfall is low,the path of rainfall into the soil should be optimized to strengthen rainwater infiltration 3.Construction of detained infrastructure;for Changjiang and Dongfang areas where the water surplus and deficit and soil water holding capacity are small,and the rainfall is low,the soil water storage capacity should be improved.Under the relationship that the overall water surplus and deficit is greater than the soil water holding capacity,for the Ding’an,Baisha,and Wenchang areas with small water surplus and deficit but large soil water holding capacity,and heavy rainfall,the regional drainage capacity should be increased;In the areas of Qionghai,Wanning,Baoting and Qiongzhong Tunchang,where there is little rainfall and heavy rainfall,the capacity of thesoil to absorb precipitation should be strengthened while keeping the drainage of the area smooth.In the relationship between the overall water surplus and deficit and the soil water holding capacity,such as Lingshui,Sanya,Wuzhishan,Danzhou,Ledong,and Chengmai areas,attention should be paid to the purification and recycling of water bodies.In the above,by combing the construction priorities of different regions,we will further guide the coordinated coupling of various infrastructures,and improve the ecology of the urban landscape by means of improving the circulation of urban water bodies.