中文摘要：

海口市东海岸拟建的离岸人工岛可能引起铺前湾内水动力和冲淤特性变化及岸线的动态调整。本文通过ECOM数值模式，建立数学模型，在模型验证的基础上，分析了建设人工岛后铺前湾海域潮流场、波浪场的变化趋势；采用多年实测地形资料，研究了铺前湾海床冲淤历史演变特征，用数学模型模拟了工程前后海床冲淤变化，分析了铺前湾冲淤特性对人工岛建设的响应。结果表明，拟建人工岛周边海域内-5m浅滩在80年代以前主要以淤积延伸为主，1980-1990年代后以侵蚀后退为主；人工岛群建成后，人工岛西侧与南渡江河口之间区域流速增大，东侧和东南侧区域内流速减小；人工岛南部形成大面积的掩护区，掩护区内浪向发生明显变化，掩护区西部N向浪偏转为NW向，东部偏转为NE向，浪高减小10％以上；人工岛东南侧海域以淤积为主；与南渡江河口之间海域以大幅冲刷为主；人工岛建成后不会形成连岛坝，铺前湾西南侧淤积区将发育沙咀。

英文摘要：

The planned construction of off shore artificial island tion pattern and the dynamic adjustment of the coast line in the matical Model and observed terrain data, the characteristics of may cause changes in erosion--deposi- Puqian Bay. With the ECOM Mathe- tidal current and erosion--deposition, the response of erosion--deposition pattern to artificial island were studied and analyzed before and after the construction of artificial island in the Puqian Bay. Results show that, around the proposed artificial island, ford within --Sm shallows mainly to siltation extends, before the 1980s and after the 1980s, ford erosion back. After the construction of artificial island, current in region between Nandu River es- tuary and island is enhanced while current in area east and southeast of the artificial island is decreased. Overall results sufficiently demonstrate that the cover area in the south of island cause the waves de- creases to more than 10% ; Deposition are increase in the southeastern sea area while erosion increase in the Nandu River estuary. There is no tomboloof dam formed after the artificial island completed, how- ever, sandspit are developed in the southwestern of Puqian Bay.