论文部分内容阅读
应用高分辨率网格和高精度的苏北浅滩地形数据,利用非结构有限体积模型FVCOM,精细化地模拟了苏北浅滩潮汐主要特征,研究了浅水分潮M4、MS4和M6的主要特征,并与前人的研究成果做了比较。本文结果显示M4和MS4分潮潮波传播特征类似,浅滩内存在3个旋转潮波系统,南侧小庙洪水道处为逆时针旋转,浅滩北侧为顺时针和逆时针旋转系统各1个。对于M6分潮,本文的结果显示存在3个无潮点,2个为逆时针,1个为顺时针。M4分潮振幅在近岸处最大能达到14cm以上,MS4分潮振幅比M4略小,M6振幅最小,仅能达到M4分潮振幅的20%左右。为了验证浅滩沙脊地貌对当地浅水分潮的影响,本文进一步在平滑地形的基础上重新模拟主要浅水分潮M4,结果表明水道和沙脊地貌参与了当地浅水分潮无潮点的形成,并且浅滩的坡度是影响振幅大小的重要因素。
Using the high resolution grid and the high-precision topographic data of northern Jiangsu shoal, the main features of shallow tidal shoal in North Jiangsu are simulated using the unstructured finite volume model FVCOM. The main features of shallow tidal moisture M4, MS4 and M6 are studied. And compared with previous research results. The results of this paper show that the characteristics of M4 and MS4 tidal wave propagation are similar. There are 3 rotating tidal wave systems in the shoal, the anticlockwise rotation of the Xiaomiao flood in the south, and one clockwise and counterclockwise rotating system on the north side of shoal . For the M6 tide, the results in this paper show that there are 3 tide-free spots, 2 anticlockwise and 1 clockwise. The amplitude of M4 moisture can reach more than 14cm at the nearshore. The amplitude of MS4 is slightly smaller than that of M4, and the amplitude of M6 is the smallest. It can only reach about 20% of the amplitude of M4 moisture. In order to verify the impact of the shallow sand ridge on the local shallow moisture tide, this paper further re-simulates the main shallow moisture tide M4 on the basis of the smooth terrain. The results show that the watercourse and the sand ridge landform are involved in the formation of the tide-free point of the local shallow water tide, The slope is an important factor affecting the amplitude.