Research On Evolution Model For Urban Lake Area And Spatial Optimization Method Of Lakefront Land Use Allocation

Urban lakes are very precious natural resource for urban developments and people's lives.They play an irreplaceable role in supplying fresh water,regulating micro climates,storing floodwaters and embellishing landscapes.So urban lakes are very significant for the harmonious and sustainable development of cities.However,the living space of these lakes has been threatened by urban expansions as further urbanization.The area of these lakes has been reduced sharply because of excessive utilization of the lakes.The decrease of urban lakes result in a lot of ecological problems,such as urban waterlogging,which have tremendous consequences for people's lives,and lead to immeasurable losses of life,property and economy.Therefore,it is significant to measure lake area changes.In recent years,researchers have realized the methods of rapid extraction of water boundaries.These methods lay the foundation for monitoring lake area in real time.However,the knowledge of driving mechanism of lake area change is even insufficient.And the existing models of lake area change are almost based on the static approach.There is still a lack of a dynamic model to simulate the evolution of lake area change.Moreover,thinking the harmonious and sustainable development between a city and the lakes in the city from the perspective of land use and cover change(LUCC)is scarce in the previous urban planning researches.In order to overcome these problems,this paper use multi-disciplinary theories and methods such as system science,urban planning and landscape and land resource management to investigate the relationships between lake area change and their surrounding LUCC based on remote sensing(RS)and geographic information system(GIS).Thus,a dynamic urban lake area evolution model(DULAEM)is built and a method of the spatial optimization and allocation of lakefront land use for both urban development and lake protection.The approaches in this paper are different from traditional hydrologic methods.It is innovative in urban water resource management.The main contents in this paper are divided into three sections as follows:(1)An elaborate relationship between lake area change and their surrounding LUCC based on the spatial analysis.Firstly,this paper measure lake area change and their surrounding LUCC using overlay and buffer analysis,and indicate the effects of urbanization on urban lakes.On this basis,lake area change and LUCC in the lakeside are abstracted into mathematical formulae respectively.And a relationship between lake area change and LUCC is built in the micro-level.By this relationship model,the impact of each LUCC on lake area change is analyzed quantitatively.(2)A dynamic urban lake area evolution model based on a MAS-CA model and a multi-level grid.In order to simulate the dynamic change of lake area by multi-agent systems(MAS)and cellular automata(CA)models,urban lakes must be ensured that there are grid-enabled.So,a new kind of multi-level hybrid grid based on the vector model and raster model is proposed for grid management of the urban lakes.On the basis of this multi-level hybrid grid,a MAS-CA model for the dynamic evolution of urban lakes is built.This model takes into consideration of the interactions between the lakes and their surrounding LUCC and the behaviors of the government agent,the developer agent and the resident agent.(3)An approach of the spatial optimization and allocation for lakefront land use based on the differential evolution(DE)algorithm.According to the relationships between lake area change and LUCC and the dynamic urban lake area evolution model,an approach of the spatial optimization and allocation of lakefront land use for both urban development and lake protection.A series of results of the spatial optimization and allocation of lakefront land use under different urban development strategies are compared and analyzed in a case study of the Hou Lake in Wuhan.The theories,models and methods in this paper provide a theoretical basis and a technical support for the harmonious and sustainable development between urban development and lake management,and provide a reference for the scientific development and utilization of lakefront land use.