A method of computing ocean currents from the distribution of water density was proposed in 1903 by I, Sandstrgm and B. Helland-Hansen. This method became known later as the dynamic method of hydrological data analysis or the dynamic method for computing’ ocean current elements.
The method is an indirect one, since it does not consider explicitly the forces that induce currents and are their primary cause. It is based on the assumption that in the steady state the horizontal pressure gradient and the coriolis force are in equilibrium in the sea below the mixed surface layer. Current velocities are computed by the dynamic method from the water density distribution which adjusts itself to the current system while developing and becoming established.

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