Measurement > Flow measurement > Current measurement Models > Mathematical models Residual flow Resources > Natural resources > Energy resources > Power from the sea > Tidal power Tidal constituents Marien/Kust; Brak water
A depth averaged numerical model is used to evaluate the residual currents generated by horizontal density gradients and M2 tidal non-linearities in the Bristol Channel (UK), a simple linear theory is used to investigate the mechanisms responsible for generation of residual currents, and computed data are compared with observations. Current patterns are presented for flows resulting from non-linearities in the continuity equation, and for those due to density gradients, advection non-linearities, and friction non linearities in the momentum equation. The comparison of computed with observed currents shows qualitiative similarities at most of the stations, and reasonable agreement for those stations where observations were carried out over one month, and where allowance is made for the expected depth variations due to density gradients.
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