
%0 Journal Article
%A Thomson, JD 
%A Godfrey, JS 
%T Circulation dynamics in the Derwent Estuary
%J Marine and Freshwater Research
%D 1985/12/01
%V 36
%N 6
%P 765-772
%K 
%R https://doi.org/10.1071/MF9850765
%U https://www.publish.csiro.au/paper/MF9850765 
%X For moderate river discharges the Derwent estuary is strongly stratified in its upstream reaches; however, salt walter is flushed completely as far downstream as Bridgewater, for river discharges greater than about 150 m3 s-1. Salinity returns to normal in this section within about 10-20 days of a rainstorm. The main mixing mechanism appears to be surface stirring by the wind; a semi-empirical formula for wind-driven entrainment velocity gives values a factor of about 1 .5 too small, but this may be due to a number of sources of observational error. Tidal mixing is detectable in the upstream Derwent, but is small compared to wind mixing in terms of induced vertical flows. 
