In order to depict the overall trend and the spatio-temporal characteristics of coastline changes of Jiaozhou Bay, the coastlines of Jiaozhou Bay in 1944, 1954, 1986, 2001, 2006, 2009 and 2012, respectively, are extracted from topographic maps and remote sensing imageries, and the end point rate, the average rate, the weighted linear regression rate are then calculated based on transects. The results are as follows: 1) The end point rate and the weighted linear regression rate can equally detect the spatiotemporal characteristics of coastline changes in Jiaozhou Bay during 1944-2012, nevertheless, the latter, with regard to the confidence interval and the correlation coefficient, is more reliable; 2) During the period of 1944-2012, the coastline of Jiaozhou Bay shows a prevailing trend of advancing seaward. Segments in the east of Baisha River are straightened and have an advancing trend but with a small magnitude; Segments near the Baisha River, Dagu River and Yang River advance in the form of the salt pan and the aquaculture pond expansion; Afterwards the coastline shifts to the seaward edge of Huangdao after it becomes a land-tied island, segments near Huangdao advances seaward in the form of the reclamation due to the vigorous development of the harbor and the harbor industry, and consequently becomes the hotspots of the coastline expansion in Jiaozhou Bay during nearly the past 30 years; 3) Coastline changes of Jiaozhou Bay see remarkable periodical characteristics, and it is shown that the eco-social development is the main driven factor of the coastal zone change: At the beginning of the New China, the construction and the expansion of salt fields are the predominant mode of coastline change, and during the period of 1980s to 1990s, both the extent and the expansion rate of aquaculture exceed the salt industry, and then, in the 21st century, the coastline development driven by the construction of harbor and harbor industry becomes the primary mode. This study provides a comprehensive understanding of the coastal utilization history of Jiaozhou Bay and its impacts on eco- environmental system, which could be used in the scientific planning and the integrated management of the coastal zone.
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