This paper examines the relative importance, in the equation of motion, of the convective acceleration terms and of the extra pressure gradient due to a longitudinal gradient of salinity up an estuary. For estuaries in which the latter is the most important, a criterion is given for the direction of mean water velocity just above the bed.
Abbott, M. R.. 1960. "Salinity effects in estuauies." Journal of Marine Research 18, (2). https://elischolar.library.yale.edu/journal_of_marine_research/949