Sand barrier morphological evolution based on time series remote sensing images: a case study of Anhaiao, Pingtan
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Sand barrier morphological evolution based on time series remote sensing images: a case study of Anhaiao, Pingtan Heshan Lin1, 2, Xingguang Yu3, Zhigang Yu1, Yikang Gao2, Jinyan Xu2*, Aiping Feng2, Zhijun Liu4, Degang Jiang2, Fan Yu2 1 College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China 2 Island Research Center, Ministry of Natural Resources, Pingtan 350400, China 3 Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China 4 Ministry of Natural Resources, Beijing 100812, China
Received 28 October 2019; accepted 28 July 2020 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract
The morphological evolution of the sand barrier in the Anhaiao coastal zone of Pingtan from 1996 to 2018 was studied. Tidal correction was used to refine the location of the coastline. A standard deviation ellipse method was applied to further analyze the movement of the barrier head with the axis and rotation angle. A natural neighbor interpolation (NNI) method was carried out to calculate the terrain of the intertidal area, and the erosion and deposition characteristics were illustrated based on the terrain. The results showed that the northern part of the sand barrier facing the lagoon area was deposited over the whole studied period, while erosion has always occurred in the southern part of the sand barrier facing the open sea. The erosion and deposition were slightly different on both sides of the barrier head due to hydrodynamic turbulence. The middle sand barrier moved 102.60 m away from its original location in 1996, and the end of the barrier moved 65.45 m. The head of the sand barrier continued moving 379 m to the northwest. Consequently, the preliminary morphological evolution of the sand barrier corresponding to the distance and direction of movement was detected. Key words: sand barrier, dynamic evolution, movement, reclamation Citation: Lin Heshan, Yu Xingguang, Yu Zhigang, Gao Yikang, Xu Jinyan, Feng Aiping, Liu Zhijun, Jiang Degang, Yu Fan. 2020. Sand barrier morphological evolution based on time series remote sensing images: a case study of Anhaiao, Pingtan. Acta Oceanologica Sinica, 39(12): 1–14, doi: 10.1007/s13131-020-1684-z
1 Introduction With the development of the Chinese economy and high population growth, most people have been moving to the developed cities in coastal areas (Lin et al., 2016), and the demand for marine resources has become increasingly severe, which has caused unrecoverable changes to certain marine ecosystems of impacted sea areas and islands. As a unique coastal ecosystem, the sand barrier-lagoon landscape performs important ecological functions, plays an important role for local residents (Tiner et al., 2015; Wang, 2009; Sun, 2013; Chen, 2011) and has suffered great pressures from natural factors and human activities. It is necessary to monitor the changes of sand barrier-lagoons to better understand the geomorphological evolution of the barriers. From the geomorphologic
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