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Water circulation in the Firth of Forth, Scotland

Published online by Cambridge University Press:  05 December 2011

P. P. G. Dyke
P. P. G. Dyke
Affiliation:
Department of Mathematics and Statistics, Plymouth Polytechnic, Drake Circus, Plymouth PL4 8AA, U.K.
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Synopsis

The Firth of Forth, in terms of physical oceanography, is part of the North Sea. The general circulation pattern in the firth must be regarded as largely speculative. There have been insufficient measurements of insufficient quality, and what evidence exists leads to the view that what circulation there is, is sluggish and varies from season to season and from year to year.

A description is given of the three principal mechanisms that contribute to circulation. Tides, due initially to astronomical forces, manifest themselves in the Firth of Forth through the rise and fall of the adjacent open sea. This rise and fall, periodic in mid ocean, is no longer strictly so in the firth and neither are the tidal currents. The wind-driven currents in the sea are influenced by the earth's rotation. In the Firth of Forth, some of this influence is retained. Naturally, wind-driven currents are larger near the surface. Finally, when water of different densities meets, overturning causes convection currents. All of these effects are present to some extent in the Firth of Forth. In addition, specific account has to be taken of complicated coastal and bottom topography and river outflow. Some attempt to bring together these effects and available measurements is made in this paper. Lastly, several theoretical models are proposed which account for the magnitudes and directions of the observed steady circulation. Mathematical details are given in appendices.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 93 , Issue 3-4: The Natural Environment of the Estuary and Firth of Forth , 1987 , pp. 273 - 284
Copyright
Copyright © Royal Society of Edinburgh 1987

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