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The "salt wedge" is an idealized model of a phenomenon encountered in some estuaries. It consists of a layer of fresh river water flowing over and past an underlying layer of heavier salt water. The following study is an attempt to predict the shape of the salt wedge and its length measured from some significant point in the estuary in terms of quantities, such as the densities of the fresh and salt water, the average river depth and velocity, etc., which are usually available.
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Farmer et al. (1952) studied this question.