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| Sand barrier morphological evolution based on time series remote sensing images: a case study of Anhaiao, Pingtan |
| Sand barrier morphological evolution based on time series remote sensing images: a case study of Anhaiao, Pingtan |
| Received:December 11, 2020 Revised:December 11, 2020 |
| DOI： |
| Key words:sand barrier, dynamic evolution, movement, reclamation |
| 中文关键词: sand barrier, dynamic evolution, movement, reclamation |
| 基金项目: |
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| 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. |
| 中文摘要: |
| 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. |
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