平衡潮理论教学中平动与惯性离心力的探讨

Discussion on Translational and Inertial Centrifugal Force in the Teaching of Equilibrium Tide Theory

本文结合《海洋概论》授课实践,对潮汐平衡潮理论教学中容易产生错误认识的平动、惯性离心力问题做了深入思考。基于物理中平动的定义,分析出地球公转不作平动;基于流体力学中亥姆霍兹速度分解公式,提出了海水平动的判断方法;最后也清楚解释了平衡潮理论简化条件在惯性离心力合理性假设中的应用。对于新学习潮汐理论的学生而言,这些内容都将起到至关重要的作用。

Combining with the teaching practice of “Introduction to Ocean”, this paper makes a deep thought on the problems of translational and inertial centrifugal force, which are easy to produce wrong understanding in the teaching of tidal equilibrium tide theory. Based on the definition of translation in physics, it is analyzed that the earth does not rotate in translation. Based on the Helmholtz velocity decomposition formula in fluid mechanics, a method of judging seawater translational motion is proposed. Finally, the application of the simplified condition of equilibrium tide theory to the hypothesis of the rationality of inertial centrifugal force is explained clearly. For students new to tidal theory, these will play a crucial role.