The Effects of Bottom Friction and Earth's Rotation on an Island's Wake
The Effects of Bottom Friction and Earth's Rotation on an Island's Wake
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底部摩擦力和地球自转对岛屿尾流的影响
DOI：
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发表时间：
1980
影响因子：
1.2
通讯作者：
L. Maddock
中科院分区：
文献类型：
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作者：
R. Pingree;L. Maddock
虽然已经有一些基础研究说明了地球自转对淹没障碍物周围流动的影响，（Hogg，1973）和岛屿（Longuet-Higgins，1969）同时包括非线性平流和摩擦效应的研究似乎相对较少（Huthnance，1972年），很少有人发现描述由于与海滩梯度有关的摩擦应力产生的涡量平流而在气流背风面发展的停滞区（Pingree & Maddock，1979）.在本文中，一些旋转流的模式，可以开发周围的岛屿，由于这些影响进行了检查，使用数值模型和整体的尝试已经说明了可能使用的数值模型作为工具的理论研究领域的研究，直到最近已经完全分析或实验。一个岛屿被一个均匀的海滩梯度所包围，该模型说明了由于摩擦和地球自转效应，不同的海底地形如何修改稳定的水流。这里只考虑具有定常尾流的非振荡流动，以便尽可能简单地检查涡源和涡汇。众所周知，摩擦效应造成的滞流区在决定沉积物沉积方面很重要，地球自转的效应可能导致沉积物分布越来越不对称（约翰逊、沃格特和施耐德，1971年）。
Whilst there have been a number of fundamental studies illustrating the effects of Earth's rotation on the flow around submerged obstacles (Hogg, 1973) and islands (Longuet-Higgins, 1969) there appear to be relatively few studies that include both non-linear advective and frictional effects (Huthnance, 1972), and few were found describing the stagnation region that develops in the lee of the flow due to the advection of vorticity generated by the frictional stress associated with a beach gradient (Pingree & Maddock, 1979). In this paper some rotational flow patterns that can develop around an island due to these effects are examined using a numerical model and an overall attempt has been made to illustrate the possible use of numerical models as a tool for theoretical investigations in areas of study that until recently have been exclusively analytical or experimental. An island is surrounded by a uniform beach gradient and the model illustrates how varying bottom topography modifies a steady flow due to both frictional and Earth's rotation effects. Only non-oscillating flows with steady wakes are considered here so that the vorticity sources and sinks can be examined as simply as possible. Stagnation regions due to frictional effects are known to be important in determining sediment deposition and the effects of the Earth's rotation may result in increasing asymmetry in sediment distributions (Johnson, Vogt & Schneider, 1971).