Characteristics of coastal erosion, siltation, and future development in Yazhou Bay, Sanya
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摘要:
基于2018—2022年海岸带地质环境调查数据，分别建立海岸线演变模型和海床冲淤模型，对岸线演变与海床冲淤特征进行分析及预测。结果表明，近几年崖州湾海岸侵蚀主要集中在盐灶河口和崖州中心渔港防浪堤东侧岸段；海岸淤积集中在月亮岛（人工岛）波影区和崖州湾科技城岸段。岸线演变预测显示，20年后崖州湾岸线最大蚀退距离约33 m，位于盐灶河口东侧；岸线最大淤进距离约99 m，位于月亮岛引桥下西侧。冲淤变化预测显示，海床最大冲刷强度约0.14 m/a，位于月亮岛外侧水域；最大淤积强度约0.07 m/a，位于科技城近岸水域。主要原因是月亮岛、中心渔港和南山港的建设改变了局部输沙方向，同时造成水动力条件的改变，从而影响整体冲淤格局。
Abstract:The geological survey data of the coastal zone from 2018 to 2022 in Yazhou Bay, Hainan Province, South China, were analyzed, based on which the characteristics of shoreline evolution and seabed scouring and siltation were revealed by modeling. Results indicate that in recent years, erosion along the Yazhou Bay coast was mainly concentrated in the section east of the Yanzao River estuary and east of the wave barrier of the Yazhou Bay Central Fishing Port. Siltation along the coast took place mainly in the wave shadow area of the Moon Island (artificial island) and the area of the Yazhou Bay Science and Technology City. Shoreline evolution predictions show that in future 20 years, the maximum retreat distance of the Yazhou Bay coast will be approximately 33 m in the east side of the Yanzao River estuary; and the maximum siltation distance will be approximately 99 m in the western side of the Moon Island bridge. Scouring and siltation change predictions indicate that the maximum scouring intensity of the seabed is approximately 0.14 m/a, located in the outer waters of Moon Island; the maximum siltation intensity is approximately 0.07 m/a, located in the nearshore waters of the Science and Technology City. The main reason is the construction of the Moon Island, the Central Fishing Port, and Nanshan Port, which have altered the local sediment transport direction and subsequently changed hydrodynamic conditions, thus affecting the overall scouring and siltation pattern.
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