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SYNOPSISThe distributions of the four variables—temperature, salinity, currents and dissolved oxygen—are discussed with particular reference to the Scottish west coast. In fjords, the distributions are related to the sources of change—tides, freshwater runoff, winds and, in the case of currents, to friction, which makes currents very variable over small areas. Current speed in floating cages has been found less than that outside. A model of the oxygen concentration in such a cage has been used to examine the conditions of current and fish stocking density under which the cage can be operated without reaching dangerously low oxygen concentrations.

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Loch Etive is a Scottish fjord subject to freshwater runoff which renders it markedly brackish. This paper considers the frequency of deep water renewal, developing a model which relates the timing of all such renewals to runoff records. Using the model one can examine the effect of changes caused by interference with the natural runoff pattern. Réglage du renouvellement des eaux profondes des fjords en utilisant un modèle qui effectue une modification du régime de l'écoulement Résumé. Le Loch Etive est un fjord écossais qui subit un écoulement d'eaux douces, ce qui le rend fortement saumâtre. Le document qui suit étudie la fréquence de renouvellement des eaux profondes et développe un modèle permettant d'établir un rapport entre les périodes de renouvellement et les écoulements. En utilisant ce modèle, on peut étudier l'effet des changements apportés par toute interférence dans le rythme naturel d'écoulement.