基于破碎动能与势能比对白冠统计物理模型的改进

发布时间：2018-02-28 07:57

本文关键词： 波浪破碎白冠模型破碎动能与势能比　出处：《国家海洋局第一海洋研究所》2017年硕士论文　论文类型：学位论文

【摘要】：白冠是海浪破碎在海表面的表现形式,是海浪能量的主要汇,白冠是否会发生和海浪的陡峭程度有很大的相关性,并且海浪破碎过程是一个很重要的过程,是海气界面层水团、动量、能量、热量和气体交换的媒介。本文主要总结了海浪破碎以及白冠覆盖率的研究进展,阐述了白冠覆盖率的研究意义,并指出共同作用于它的众多环境影响因子。白冠覆盖率具有高度可变性,为了更加现实的模拟全球海域范围内的白冠覆盖率,本文改进了基于海浪破碎参数的白冠覆盖率模型。基于海浪统计物理模型,我们从理论上对破碎动能与势能比进行了估计,它的取值范围和应用都在本文中被讨论,确定破碎动能与势能比θ范围在3-30之间,并且实际的应用中在无限风时风区的海况下确定了一个理论值θ=8。基于实验测量数据,重新修正了泡沫密集度函数F_T的取值,通过数值积分确定为F_T=0.75。完成对θ和F_T的确定之后,我们利用最小二乘法拟合得到新的系数值C_(en)= 0.1777和n =-1.713。在实际普通海况下对新系数进行了一系列的改进与验证,并且与卫星反演得到的白冠覆盖率进行了对比分析。
[Abstract]:White crown is the manifestation of wave breaking on the sea surface and the main sink of wave energy. Whether or not the white crown will occur is closely related to the steep degree of wave, and the process of wave breaking is a very important process, which is the water mass in the interface layer of sea and air. Momentum, energy, heat and gas exchange media. This paper summarizes the research progress of ocean wave breaking and white crown coverage, and expounds the significance of white crown coverage. It is pointed out that the white crown coverage is highly variable in order to simulate the global sea area coverage more realistically. In this paper, the white crown coverage model based on wave breaking parameters is improved. Based on the wave statistical physical model, we estimate theoretically the ratio of breaking kinetic energy to potential energy. The range of its value and its application are discussed in this paper. It is determined that the ratio of breaking kinetic energy to potential energy is in the range of 3-30, and a theoretical value 胃 ~ (8) is determined under the sea condition in the wind region of infinite wind in practice. Based on the experimental data, the value of the foam density function FT is revised. After the determination of 胃 and Fflesh T is completed, we use the least square method to fit the new coefficient values Che Eng = 0.1777 and n / O -1.713.The new coefficient is improved and verified under the actual ordinary sea conditions. And the white crown coverage rate obtained by satellite inversion is compared and analyzed.
【学位授予单位】：国家海洋局第一海洋研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P731.22

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