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| 地衡流速× | 調和解析 (Tidal Harmonic Analysis)× | |
|---|---|---|
| 分野 | 海洋学 | 海洋学 |
| 系統 | Process / pipeline | Process / pipeline |
| 提唱年≠ | 1942 | 1867 |
| 提唱者≠ | Harald Sverdrup | William Thomson |
| 種類≠ | theoretical-method | fourier-analysis |
| 原典≠ | Sverdrup, H. U., Johnson, M. W., & Fleming, R. H. (1942). The Oceans: Their Physics, Chemistry, and General Biology. Prentice-Hall. link ↗ | Godin, G. (1972). The Analysis of Tides. University of Toronto Press. link ↗ |
| 別名 | Geostrophic Current, Thermal Wind Equation | Tidal Constituents, Harmonic Tidal Prediction |
| 関連 | 3 | 3 |
| 概要≠ | Geostrophic velocity is the current driven by balance between the pressure gradient force and the Coriolis force, derived from the thermal wind equation. In most of the ocean away from the equator and coastal boundaries, geostrophic balance is an excellent approximation to the actual flow. Developed by Harald Sverdrup and colleagues in the 1940s, geostrophic velocity calculation from hydrographic data enables estimation of ocean currents without direct current measurements. | Tidal harmonic analysis is a mathematical method that decomposes observed sea level or current time series into a sum of sinusoidal components with specific frequencies, amplitudes, and phases corresponding to astronomical tidal constituents. Developed by William Thomson (Lord Kelvin) in 1867, harmonic analysis enables prediction of tides and understanding of tidal dynamics in coastal regions. |
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