| The coastal zone is a long belt-like area where land and sea meet.Since the founding of New China,combined with the economic deployment of Europe,America and Southeast Asian developed countries,China has begun to develop an export-oriented economy,and coastal cities have become the pioneers of China's economic development and utilization of marine resources.Coastal cities in Liaoning Province are at the forefront of economic development in northeastern China.They carry important responsibilities connecting Beijing,Tianjin and Heiji,and they are across the sea from important port cities such as Weihai in Shandong.First,it is currently China's key economic development zone.Therefore,the continuous long-term dynamic monitoring and systematic analysis of the evolution of the coastline is of great significance.Based on the Landsat images in 1980,1990,2000,2010 and 2017,this paper analyzes the coastline changes in Liaoning Province using the GIS and RS technology,and uses the depth model and stability index Research methods,systematically study the stability of the coastline of Liaoning Province,analyze the driving factors of the coastline evolution of Liaoning Province through the Pearson correlation analysis method,and preliminary explore the causes of natural and socio-economic development factors on the spatial and temporal changes of the coastline of Liaoning Province The results are:(1)The coastline of Liaoning Province has undergone complex changes during the nearly 40-year period from 1980 to 2017.The overall length of the coastline is mainly divided into three stages,a length shortening stage,a slow length growth stage,and a rapid length growth stage.From the perspective of time,from 1980 to 1990,the coastline was slowly shortened,from 1990 to 2000,the coastline grew slowly,and from 2000 to 2017,the coastline grew rapidly;from a spatial perspective,the largest increase in coastline length was Dalian.The evolution of the coastal area of Liaoning Province showed a trend of decreasing,increasing and then decreasing.2000-2010 is the largest stage of coastal land area increase in Liaoning Province in the past 40 years,with an increase of 466.87km2 and an average rate of change of 46.69km2 / a.The characteristics of the coastline type change in Liaoning Province are very obvious.The proportion of natural coastlines has dropped sharply,and the proportion of artificial coastlines has increased significantly.(2)The coastline stability of Liaoning Province has undergone dramatic changes due to both natural and man-made influences.Through the calculation and analysis of the changes in the depth of the coastline and the stability of the coastline in the past 40 years,the spatial position of the coastline in Liaoning Province has experienced changes The four stages of shoreline stabilization phase,shoreline imbalance phase,obvious shoreline advancement and shoreline acceleration rate are coupled with the change trend of sea area spatial resource utilization in Liaoning Province.Liaoning Province has the largest proportion of stable shoreline and strong shoreline entrance line.The strong shoreline and strong shoreline are mostly distributed in Panjin City and Dalian City,while the stable shoreline is concentrated in the three cities of Dalian,Huludao and Dandong.The stability index of the coastline of Liaoning Province has decreased year by year,and it has decreased by 0.89 in the past 40 years.On the whole,the stability index of the coastline of Panjin City is always less than 1,and the stability indexes of Dandong City,Dalian City and Huludao City are higher,all higher than 1.(3)Through Pearson correlation analysis,quantitatively analyze the interaction between coastline length changes and driving factors,and qualitatively analyze the effects of human factors and socio-economic development factors on coastline changes,so as to conclude that there is a close relationship between socioeconomic development and the spatiotemporal changes of coastline in Liaoning relationship. |
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