Salinity Stratification and Vertical Shear Transport in an Estuary View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1990

AUTHORS

R. J. Uncles , J. A. Stephens

ABSTRACT

The intratidal behaviour of the vertical shear dispersion transport for salt over three cross-sections in the upper reaches of the Tamar Estuary is presented for spring and neap tides. A variable, ψ, is defined which is proportional to the vertical shear salt flux at each instant and is equal to the negative salt flux due to vertical shear divided by the tidally-averaged longitudinal salinity gradient. The tidal average of ψ can be compared with dispersion coefficients deduced from tidally-averaged or long-term data from other estuaries. Temporal variability in ψ is discussed in terms of the root-mean-square deviations (about the depth-mean values) of the vertical profiles of salinity and longitudinal current over each tidal cycle. During spring tides ψ maximizes on the ebb within 3 h of high water and, depending on the section, this maximum lies in the range of 100–310 m2/s (compared with 140–470 m2/s at neap tides), with large values occurring for 2–3 h periods during the ebb. At the end of the ebb and during the flood ψ is very small and can be negative. Similar behaviour is exhibited by ψ during neap tides at the cross-section nearest the head. However, at the most seaward cross-section the velocity shear, stratification and ψ maximize at low water rather than the early ebb. A one-dimensional model of the vertical current structure which uses prescribed salinity fields and which calculates ψ is able to reproduce this behaviour. The model is also used to provide insight into the effects of stratification and its ebb-flood asymmetry on the intratidal and tidally-averaged (residual) currents. More... »

PAGES

137-150

Book

TITLE

Residual Currents and Long-term Transport

ISBN

978-1-4613-9063-3
978-1-4613-9061-9

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4613-9061-9_11

DOI

http://dx.doi.org/10.1007/978-1-4613-9061-9_11

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1044941295


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