中文摘要：

在 Beibu 海湾的水循环和沉积运输为它的环境保护和资源利用是重要的。由采用为系统(ROMS ) 建模的地区性的海洋，我们在 Beibu 海湾学习了循环，沉积运输和长期的词法进化的季节的变化。模拟结果证明潮和风导致的发行量在海湾在冬季和夏天两个都是气旋的并且风驱动的发行量在夏天比那在冬季是更强壮的。沉积集中在 Qiongzhou 海峡，海南岛的西方和越南和 Leizhou 半岛的海岸是更高的。沉积在 Qiongzhou 海峡在夏天在冬季并且向东向西被搬运。Qiongzhou 海峡的西方入口被统治由向西一整年搬运。在河边解除的沉积在河嘴附近被扔。模仿的结果证明沉积运输被潮汐的导致的底部暂停主要在 Beibu 海湾控制。四个特征为侵蚀和免职的分发模式被总结。(1 ) 侵蚀和免职最是不足道的在里面海湾的区域。(2 ) 沉积免职在 Qiongzhou 海峡的嘴是更重要的。(3 ) 侵蚀在 Qiongzhou 海峡的海床被观察。(4 ) 侵蚀和免职在海南岛的西方或者发生。

英文摘要：

Water circulation and sediment transport in the Beibu Gulf are important for its environmental protection and resource exploitation.By employing the Regional Ocean Modeling System（ROMS）,we studied the seasonal variation of circulation,sediment transport and long-term morphological evolution in the Beibu Gulf.The simulation results show that the circulation induced by tide and wind is cyclonic both in winter and summer in the gulf and that the wind-driven circulation is stronger in winter than that in summer.The sediment concentration is higher in the Qiongzhou Strait,west of the Hainan Island and the coast of Vietnam and the Leizhou Peninsula.The sediment is transported westwards in winter and eastwards in summer in the Qiongzhou Strait.The west entrance of the Qiongzhou Strait is dominated by westward transport all the year round.The sediment discharged by rivers is deposited near the river mouths.The simulated result demonstrates that the sediment transport is mainly controlled by tidal induced bottom resuspension in the Beibu Gulf.Four characteristics are summarized for the distribution patterns of erosion and deposition.（1） The erosion and deposition are insignificant in most area of the gulf.（2） Sediment deposition is more significant in the mouths of Qiongzhou Strait.（3） The erosion is observed in the seabed of Qiongzhou Strait.（4） Erosion and deposition occur alternatively in the west of Hainan Island.