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Vertical velocity of mantle flow of East Asia and adjacent areas


Some important results and understandings are gained from the images of the vertical velocity of mantle flow for East Asia and the West Pacific.


It is shown that the vertical velocity component is small and the motion in the jet has a layered structure.


It is shown that for relatively large steadystate flow velocities and at certain fluid depth ratios the vertical velocity profile is nonlinear.


The solutions of the problem for the stream function (or the vertical velocity component) and the temperature are represented in the form of double or triple Fourier series.

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 By assuming that the vortex of current is small and that the current velocity is constant along vertical direction, a mildslope equation for wave propagation on nonuniform flow is deduced from basic hydrodynamics equations and the terms of 2 hh and ( hh) 2 are included in the equation. The terms describing the effects of bottom friction, wind input and wave nonlinearity are also introduced into the equation. The wind input functions... By assuming that the vortex of current is small and that the current velocity is constant along vertical direction, a mildslope equation for wave propagation on nonuniform flow is deduced from basic hydrodynamics equations and the terms of 2 hh and ( hh) 2 are included in the equation. The terms describing the effects of bottom friction, wind input and wave nonlinearity are also introduced into the equation. The wind input functions for wind waves and swells are separately considered by adopting Qindao Ocean University′s empirical formula for wind waves and Snyder′s observation results for swells. Thus, an extended mildslope equation is obtained, in which the effects of refraction, diffraction, reflection, current, bottom friction, wind input and wave nonlinearity are considered comprehensively.  从流体力学基本方程出发 ,假定水流的涡量和垂向流速分量为小量 ,推导出考虑非均匀水流的推广的缓坡方程 ,该方程中包含了 2hh项和 ( hh) 2项。在方程中引入底摩擦项、风能输入项和非线性项 ,其中风能输入项的推导考虑了风浪与涌浪的区别 ,风浪情况依据青岛海洋大学的风浪成长经验关系 ,涌浪情况依据 Snyder等人的观测结果。经过上述推广后 ,得到综合考虑折射、绕射、反射、非均匀水流、底摩擦损耗、风能输入及波浪非线性的推广的缓坡方程。  Based on the formula of vertical flux of total suspended matters in sea water and according to suspended matter concentration, its vertical flux and settling velocity, a new method evaluating the vertical velocity of sea water has been put out. When settling velocity is unknown, we can identify whether sea water flowing vertically is obvious.The observed data obtained from East China Sea field measurement in 1994 have been analyzed with evaluation and calculation methods. The conclusion is that there is upwelling... Based on the formula of vertical flux of total suspended matters in sea water and according to suspended matter concentration, its vertical flux and settling velocity, a new method evaluating the vertical velocity of sea water has been put out. When settling velocity is unknown, we can identify whether sea water flowing vertically is obvious.The observed data obtained from East China Sea field measurement in 1994 have been analyzed with evaluation and calculation methods. The conclusion is that there is upwelling in whit velocity is 2.6×10 3 cm/s Station 111, but the upwelling can't reach to the sea surface. There is good coincidence between calculation result and observed data.  依据海水中悬浮物垂直通量的计算公式 ,提出了一种利用悬浮物含量、垂直通量和静水沉速估算海水垂向流速的新方法。当悬浮物静水沉速未知时 ,可用判别方法对海水是否存在显著垂向流动做基本判断。同时采用估算及判别方法对东海9404航次两连续站111和410的实测资料进行分析 ,得出了410站的海水不存在显著的上升流动 ,而111站的海水不仅存在上升流动 ,流速约为2.6×10 3cm/s ,而且在时均情况下 ,上升流不能达到表层的结果。此判断结果与以往的观测和结论以及本次观测结果相吻合。  The velocity field in the sea waters around the Huanghua Harbor is simulated by using the threedimensional tidal current model, variations of the velocity field of tidal current before and after construction of the Huanghua Harbor are analyzed, and the phenomena of the current along the breakwaters, the current across the entrance channel and its action on the sediment transportation are presented. Analysis results show that the flow′s vertical velocity varies notably and will play an important role in sediment... The velocity field in the sea waters around the Huanghua Harbor is simulated by using the threedimensional tidal current model, variations of the velocity field of tidal current before and after construction of the Huanghua Harbor are analyzed, and the phenomena of the current along the breakwaters, the current across the entrance channel and its action on the sediment transportation are presented. Analysis results show that the flow′s vertical velocity varies notably and will play an important role in sediment transportation under the action of northeast wind of Scale 8 nearby the Huanghua Harbor sea water.  利用三维潮流数学模型模拟黄骅港附近海域的流场,分析了黄骅港建港前后海域潮流场的主要变化,以及建筑物引起的沿堤流和口门横流及其对泥沙运动的作用.在NE向8级风作用下,黄骅港附近海域水流的垂向流速变化非常显著,对泥沙输移起重要作用.  
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