Comparer des méthodes

	Vitesse géostrophique	Profilomètre acoustique Doppler de courant	Analyse harmonique des marées
Domaine	Océanographie	Océanographie	Océanographie
Famille	Process / pipeline	Process / pipeline	Process / pipeline
Année d'origine	1942	1983	1867
Auteur d'origine	Harald Sverdrup	RD Instruments	William Thomson
Type	theoretical-method	instrumental	fourier-analysis
Source fondatrice	Sverdrup, H. U., Johnson, M. W., & Fleming, R. H. (1942). The Oceans: Their Physics, Chemistry, and General Biology. Prentice-Hall.	RD Instruments. (1996). Acoustic Doppler Current Profiler Principles of Operation. A Practical Primer. RD Instruments Technical Note.	Godin, G. (1972). The Analysis of Tides. University of Toronto Press.
Alias	Geostrophic Current, Thermal Wind Equation	ADCP	Tidal Constituents, Harmonic Tidal Prediction
Apparentées	3	3	3
Résumé	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.	The Acoustic Doppler Current Profiler (ADCP) is an instrument that uses Doppler-shifted acoustic backscatter to measure water velocity profiles along a vertical profile. Developed by RD Instruments in the 1980s, it has become the standard method for high-resolution current profiling in oceanographic research. ADCPs provide unprecedented spatial and temporal resolution of ocean circulation patterns.	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.