(1) 山东师范大学地理与环境学院

The coastal zone is the border area between the land and the ocean. The marine resources are rich. In particular, since the reform and opening up in 1978, the coastal economy has developed rapidly. The rapid urbanization process has led to large-scale exploitation of coastal resources, and human activities severely affected shoreline evolution in the Bohai Rim region. Therefore, studying the changes of coastline and reclamation evolution is conducive to the sustainable development of coastal regional economy and the supervision and management of decision-making departments. The spatial-temporal evolution characteristics of the shoreline under the action of sea reclamation were researched based on the remote sensing images in nine years (1980, 1985, 1990, 1995, 2000, 2005, 2010, 2015 and 2017). The MNDWI method, transfer matrix of land use, the fractal dimension method and regression analysis were used in the study. These data were processed by 3S technology and the soft wares of eCognition9.0, ArcGIS10.2 and SPSS. The results show that the Yellow River delta, Laizhou bay, Bohai bay and Liaodong bay changed a lot, the natural shoreline length decreased by 80%, whereas the artificial shoreline increased by 1 977.9 km in past 40 years. The fractal dimension of shoreline has been increased and tended to zigzag. Meanwhile, sea reclamation area increased by 1 988.5 km~2 during 1980-2017. Its main land use types are transformed from aquatic farm, salt field and agricultural land to aquatic farm, salt field and construction land. There is a significant linear relationship between the reclamation process and the change of the length of the coastline. To sum up, the sea reclamation evolution affects the changes of shoreline, including aquaculture, farmland reclamation, industrialization and urban construction, etc.