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Radial tidal current field in a semi-enclosed rectangular basin: formation and evolution
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作者 钱学生 陈永平 +2 位作者 张长宽 潘毅 DAS Himangshu 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2015年第4期1085-1099,共15页
The radial tidal current field accounts for the formation of the radial sand ridges in the South Yellow Sea. Understanding the formation and evolution of this radial tidal current field is vital to assessing the morph... The radial tidal current field accounts for the formation of the radial sand ridges in the South Yellow Sea. Understanding the formation and evolution of this radial tidal current field is vital to assessing the morphodynamic features in the area. A semi-enclosed rectangular basin with and without a coastal barrier was schematized from the topography of the Bohai Sea and Yellow Sea. The 2D tidal current field in this basin was simulated using the DELFT3D-FLOW model. The concept of tidal wave refraction, which highlights the effect of the sloped or stepped submarine topography on the propagation of the tidal waves, was introduced to explain the formation of the radial tidal current field. Under the effect of tidal wave refraction, co-phase lines of the counterclockwise rotating tidal wave and incident tidal wave are transformed into clockwise and counterclockwise deflections, respectively, leading to the convergence and divergence of the flow field. Regardless of whether a coastal barrier exists or not, the outer radial tidal current field might emerge over certain topography. The responses of the radial tidal current field in this basin to the environmental variations such as coastline changes and bottom erosions were discussed. Results show that local protrusion near the focal point of the radial tidal current field will have limited effects on the location of the tidal system. However, a remarkable shift of the amphidromic point toward the entrance and central axis of this basin and a movement of the focal point of the radial tidal current field toward the entrance could be caused by the significant seaward coastline advance and submarine slope erosion. 展开更多
关键词 semi-enclosed rectangular basin coastal barrier M2 tide amphidromic point radial tidal current field
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带丁坝型半封闭矩形海湾中M_2分潮潮波和潮流特性分析 被引量:3
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作者 钱学生 陈永平 张长宽 《海洋学报》 CAS CSCD 北大核心 2014年第9期37-44,共8页
将黄渤海海域概化为矩形海湾,山东半岛概化为垂直于海岸的巨型丁坝,形成一个带丁坝型半封闭矩形海湾。利用DELFT3D-FLOW计算模块在上述海湾中进行了M2分潮数值模拟,对其无潮点和辐射状潮流场的特性进行了分析。研究发现:考虑科氏力影响... 将黄渤海海域概化为矩形海湾,山东半岛概化为垂直于海岸的巨型丁坝,形成一个带丁坝型半封闭矩形海湾。利用DELFT3D-FLOW计算模块在上述海湾中进行了M2分潮数值模拟,对其无潮点和辐射状潮流场的特性进行了分析。研究发现:考虑科氏力影响和巨型丁坝反射作用,坝前形成了明显的无潮点,但在等水深条件下并未形成辐射状潮流场,而叠加上倾斜海底地形后其得以形成;无潮点和辐射状潮流场顶端位置受水深影响明显,随着平均水深的增大,无潮点将向湾口和湾中轴线方向偏移,而辐射状潮流场顶端则向湾口方向偏移。研究结果有助于加深对带丁坝型半封闭矩形海湾中驻潮波系统形成机制和动力特性的理解和认识。 展开更多
关键词 带丁坝型矩形海湾 M2分潮 驻潮波 无潮点 辐射状潮流场
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苏北滨海平原区古潮流场的数值模拟及其验证 被引量:5
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作者 朱玉荣 《海洋通报》 CAS CSCD 北大核心 1998年第3期1-7,共7页
建立了渤海、黄海、东海的二维潮流数学模型,对7000a B.P.与3800a B.P.的潮汐、潮流进行了数值模拟。根据计算结果,在7000a B.P.与3800a B.P.时,分别存在以长江河口湾湾顶为顶点向海凸起的独立驻潮波系统,受该独立驻潮波系统的控制,长... 建立了渤海、黄海、东海的二维潮流数学模型,对7000a B.P.与3800a B.P.的潮汐、潮流进行了数值模拟。根据计算结果,在7000a B.P.与3800a B.P.时,分别存在以长江河口湾湾顶为顶点向海凸起的独立驻潮波系统,受该独立驻潮波系统的控制,长江河口湾成为外海涨落潮流辐聚、辐散的顶点,长江河口湾中轴线以北,潮流辐聚、辐散的态势与现今南黄海的颇相似。由此推断,从7000a B.P.的末次冰期最大海侵到现代,长江口、苏北岸外的辐射状潮流场一直存在,并没有因江苏海岸变迁发生根本变化。由数值模拟获得的长江口、苏北岸外的古潮流场分布格局也得到现有钻孔揭示的古流向的证实。 展开更多
关键词 辐射沙洲 海侵 数值模拟 古潮流场 滨海平原区
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