Abstract
The pattern of salinity and dissolved oxygen stratification in a partially-stratified estuary was delineated from results obtained during a pollution study of the Tyne Estuary in North-east England. Salinity data showed that the estuary was normally partially-stratified but could become well-mixed at low freshwater flow. However, a two-layer flow system always existed, even under well-mixed conditions. Unlike salinity stratification, dissolved oxygen stratification existed at all freshwater flow rates due to the two-layer flow condition and the self-purification process. It is suggested that only the surface and bottom dissolved oxygen conditions are required for practical use in pollution control of partially-stratified estuaries. A simple method of determining the surface and bottom dissolved oxygen concentrations from the depth-averaged concentration was developed and found to give satisfactorily accurate results.
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