风浪增长效率的守恒律和边界
Conservation Laws and Bounds on the Efficiency of Wind-Wave Growth
摘要：
我们研究两种方式，风可以赋予能量波：遮蔽和沉积的材料向上迎风面剪切。剪切驱动沉积被证明是更有效的过程。波浪的长度与风速相匹配被证明是非常低效的，并且消耗了风赋予的大部分能量。表面切变提供了一个低能量汇，吸收了风的大部分动量。这就限制了波浪增长的效率。这里的结果计算在一个独立的模型和扰动自由的方式，通过仔细考虑守恒定律。通过结合这些效应，我们可以对波在给定的风场中可以增长的速率以及切变流相对于必须出现的相对较小的斯托克斯漂流的相对量设置界限。
英文摘要：
We examine two means by which wind can impart energy to waves: sheltering and deposition of material upwards from windward surface shear. The shear driven deposition is shown to be the more efficient process. Lengthening of waves to match the wind speed is shown to be very inefficient and consume a large fraction of the energy imparted by the wind. The surface shear provides a low energy sink that absorbs most of the momentum from the wind. These produce bounds on the efficiency of wave growth. The results here are computed in a model independent and perturbation free fashion by a careful consideration of conservation laws. By combining these effects we can place bounds on the rates waves can grow in a given fetch and the relative amount of shear flow versus the, relatively small, Stokes drift that must arise.
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