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.

研究了平潭市安海澳沿海地区1996年至2018年防沙层的形态演化。潮汐校正用于完善海岸线的位置。应用标准偏差椭圆法进一步分析了防护头的运动以及轴线和旋转角度。进行了自然邻域插值（NNI）方法来计算潮间带的地形，并根据该地形图说明了侵蚀和沉积特征。结果表明，在整个研究时期内，面向泻湖区的防沙层的北部都是沉积的，而面向大海的防沙层的南部则一直发生侵蚀。由于流体动力湍流，在屏障头两侧的腐蚀和沉积略有不同。中间的防沙层从1996年的原始位置移开102.60 m，防沙层的末端移开了65.45 m。防沙层的头部继续向西北移动379 m。因此，检测到防沙层的初步形态演化与移动的距离和方向相对应。