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在潮波动力学中,底摩擦在潮波之间的相互作用中起着很大的作用。本文将与速度平方成正比的底摩擦项展成一个Fourier级数,并讨论了底摩擦引起的潮波之间的相互干扰。 由非线性动量方程,我们得到机械能方程。利用以上的 Fourier级数,本文由机械能方程给出一种求解某一区域上平均拖曳系数C_D的方法。将此方法应用于渤海,求得该海区的拖曳系数C_D=0.0013。
In tidal wave dynamics, bottom friction plays a large role in the interaction between tidal waves. In this paper, the bottom friction term proportional to the square of the velocity is developed into a Fourier series, and the mutual interference between the tidal waves caused by the bottom friction is discussed. From the nonlinear momentum equation, we get the mechanical energy equation. Using the above Fourier series, a method to solve the average drag coefficient C_D in a certain area is given by the mechanical energy equation. Applying this method to the Bohai Sea, the drag coefficient C_D of this sea area is calculated as 0.0013.