NUMERICAL SIMULATION OF THE TIDAL MOTION AND SUSPENDED SEDIMENT TRANSPORT IN THE RADIAL SANDBANK AREA OF THE SOUTHERN YELLOW SEA

A coupled 2-D numerical model for hydrody-namic-sediment transport wasestablished and applied to simulate the tides, tidal currents and sediment movement in the submarineRadial Sandbank area of the southern Yellow Sea. With a high-resolution topography dataset used inthe model, the simulation reproduced a fine-structured current field and e-rosion-siltationdistribution. The modeled results show that, in the area of Radial Sandbanks, reversing tidalcurrent and seabed erosion occurs within troughs while tidal current with more rotary feature anddeposition occurs above sandbanks, which indicates the tidal-induced formation of the RadialSandbanks. During a tidal period, associating with the variation of current speed, erosionalternates with siltation. The seabed deformation depends on the relative strength of erosion andsiltation in a tidal period.

Two-level parallel independent component analysis endmember extraction algorithms

在多对称处理器集群体系结构下进行独立成分分析并行算法研究,在共享内存模型一级并行算法基础上,通过同步、异步迭代两种方式并行计算固定点函数,分别提出具有两级并行特性的二级同步、二级异步并行端元提取算法,并结合两者的优势,进一步提出二级分组并行算法。实验评价表明,二级同步、分组并行算法在保持原算法精度的同时,大大提高了原算法的效率,体现出良好的并行计算性能,而二级异步并行算法可在节点数较少的情况下适用。