Research On Evolvement And Optimization Of Coastal Port City’s Spatial Structure

Since ancient times,the port plays a connecting link between the region and overseas.Meanwhile,for the truth that born in Harbor,thriving for Harbor,it gave birth to the development of the harbor city,and witnessed the process from Inland Era to the Ocean Era.At present,in the worldofmore than 500 famous cities.Thereare446 port city.As the global economic focus onthe coastal zone,the coastal port cityhasbecame the main port citydevelopmentcenter,and constitute the core strength of the world city.In recent years,with the internal and external factors,the sea port city space is facing restructuring,Soit is important to study the coastal port city the spatial structure evolution and optimization.The point-axis system theory model and measure space graphics analysis method,using thethought of "status of qualitative analysis-point axis space analysis method quantitative research-theoretical conception and reality check",researched the dynamic mechanism,characteristics,evolution patterns or spatial optimization of the coastal harbor citiesregional’s spatial structure,took Tianjin asthe key object of study.Through literature study,from the port location,port spatial structure evolution,port region space relations,the port city space structure,course of study of domestic and foreign cards and reviews.It is pointed out that the future needs further research direction,which should strengthen the comparison of developing countries and thearea of different types of cities,which shouldstrengthen the quantification and multi discipline comprehensive research,which shouldintroducenew factors and mechanism,expand the research methods and perspective,so for coastal port city spatial development pattern to explore,we also should implementto predict the development trend and spatial optimization purposes.Through the case analysis,we have studied the spatial evolution rules ofthe six famous harbor cities,have analized the experience,have summarized the general rules and characteristics of coastal harbor city’s development,and have provided beneficial inspiration for the spatial development of Tianjin.Tianjin,as a typical representitve,which is the lagest coastal port city in northern of China,born of water,and thriving of transportation,which is a typical.This essay,Based on the stages of the dynamic mechanism about development,evolution or characteristics in Tianjin,analyzed and summarized;Based on the current situation of Tianjin’s spatial structure,we introduced point-axis system theory and fractal dimension,compactness,space expansion intensity measurement as quantitative analysis,combined the exploration of development model,and put forward the conception of Tianjin’s spatial structure.At last,combined with the reality of development,we put forward optimization strategies to guide space structure in the future from the direction of development,spatial development model orthestrategy of optimization.