Abstract
Extraction and analysis of the shoreline and land reclamation patterns are important for studies on topics such as the dynamics of coastal wetland ecological environments, transportation and exchange of material energy in coastal regions, and recruitment of fishery resources. Spatial-temporal variations in the shoreline and land reclamation in the Bohai Sea were analyzed based on 49 Landsat images of 7 periods from 1985 to 2015. The following conclusions were drawn. (1) The extracted shoreline data based on visual interpretation had high precision, and the shoreline extraction errors could be controlled within the theoretical range. (2) Over the past 30 years, the shoreline of the Bohai Sea has exhibited an average rate of change of 188.47 m/a and an average accretion distance of 3.55×103 m toward the sea. The fastest rate of shoreline change occurred in Laizhou Bay (134.78 m/a), followed by Bohai Bay (128.20 m/a) and Liaodong Bay (61.69 m/a). (3) The average rate of reclamation was 3.25×104 ha/a in the Bohai Sea, where the total area of aquaculture land, unused land, and salt land exceeded 60% of the total reclamation area. (4) The geometric shape of the bay became increasingly complicated from year to year, and the geometric center of gravity of the bay moved rapidly toward the sea. In addition, the area of the bay showed a significant decreasing trend. Therefore, to protect the function and structure of the ecosystem in coastal regions, we must control the scale and rate of land reclamation in the future.
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Acknowledgments
The authors thank Professor HOU Xiyong, Dr. LIU Yubin, and Dr. SONG Yang from the Yantai Institute of Coastal Zone Research, CAS, for their help. The authors also thank the editor and reviewers for their thoughtful and thorough reviews, which greatly improved this study.
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Foundation: The National Basic Research Program (973 Program) of China, No.2015CB453303; The Aoshan Scientific and Technical Innovation Program, No.2015ASKJ02-05; The Special Fund of the Taishan Scholar Project and the “Aoshan Talent” Project; Laboratory for Marine Fisheries Science and Food Production Processes; Pilot National Laboratory for Marine Science and Technology (Qingdao), No.2017ASTCP-ES07
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Ding, X., Shan, X., Chen, Y. et al. Dynamics of shoreline and land reclamation from 1985 to 2015 in the Bohai Sea, China. J. Geogr. Sci. 29, 2031–2046 (2019). https://doi.org/10.1007/s11442-019-1703-1
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DOI: https://doi.org/10.1007/s11442-019-1703-1