Abstract
The rising solar pond is a configuration in which brine is injected into the pond so as to give all or part of the gradient an upward velocity. This injection alters the salinity profile, steepening it adjacent to the gradient zone upper boundary and thus helping to minimize gradient erosion there. This paper presents analytic expressions for the steady-state salinity profiles in a rising pond, calculated as a function of injection and pond parameters for a constant solutal diffusivity, and also for a temperature-dependent diffusivity. Salinity profiles for various cases are related to specified temperature profiles to determine stability within the gradient zone. Injection into the gradient near the upper boundary is shown to provide the needed increase of boundary gradient with minimal reduction of the margin of safety for internal stability. Suggestions are given for practical implementation of the rising pond concept.
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