海滩是砂质海岸重要的沉积地貌单元，其沉积特征和稳定性对于海滩的开发利用与保护具有重要意义。本文根据海口湾西海岸海滩表层沉积物粒度数据，阐述了该区域海滩沉积物的时空分布规律，并通过对比滩面高程数据和水下地形数据分析了该区域的岸滩稳定性。结果表明：海口湾西海岸海滩处于滩面微蚀的轻度不稳定态，其岸外浅滩处于边坡侵蚀的轻度不稳定态。另外，根据波浪作用和泥沙来源进一步探讨了海口湾西海岸海滩沉积物动力机制及其海滩侵蚀的原因。
Beach is an important sedimentary morphological unit of sandy coast, and its sedimentary characteristics and stability are significant for its reasonable utilization and protection. Based on the grain-size data of beach surface sediment in the west coast of Haikou Bay, temporal and spatial distribution of beach sediment was explored; and the stability in this area was also analyzed through the comparison of beach height and underwater topography. The results show that the beach is on the slightly unstable stage of surface erosion, and that the shoal outside of the coast is on the slightly unstable stage of slope erosion. Moreover, the sedimentary dynamic mechanism and the reason of the beach erosion in the west coast of Haikou Bay were studied according to wave actions and sand sources.
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