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本文用比较简单的方法对有限水深二维无旋进行波的能流进行了精确劈分,通过对能流的数值计算,证实能流主要是由于流体压强作功而引起的,但有时动能与势能引起的能流也可占相当比例,在极端情况下可达30％。本文还对目前实际工作中通用的按小振幅波理论计算能流的方法的误差作了讨论。另外,本文进行能流劈分的推导方法适用于有限水深和无限水深,比Starr对深水能流进行劈分的方法更简单和直接,因此本文所用的推导方法是对starr推导方法的一种改进。
In this paper, a simple method is used to precisely split the energy flow of two-dimensional non-convoluted waves in a finite water depth. By numerical calculation of energy flow, it is proved that the energy flow is mainly caused by the fluid pressure. However, Potential energy-induced energy flow can also be a considerable proportion, in extreme cases up to 30%. This paper also discusses the error of the method of calculating energy flow according to the theory of small amplitude wave which is commonly used in practical work. In addition, the derivation method of energy splitting applied to finite water depth and infinite water depth is more simple and direct than Starr’s method of splitting deep water energy flow. Therefore, the derivation method used in this paper is an improvement of starr’s derivation method .