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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Analytical investigation of superimposition between predominant m2 and other tidal constituents in e...
Analytical investigation of superimposition between predominant m2 and other tidal constituents in estuaries
Author : HUAYANG CAI (1), MARCO TOFFOLON (2) & HUBERT H. G. SAVENIJE (3)
ABSTRACT
Analytical solutions for tidal hydrodynamics developed to date mainly focus on one predominant tidal constituent (e.g.,
semidiurnal M2), which fails to explain the tidal asymmetry when tide propagates upstream due to the fact that the tidal
spectrum consists of different tidal constituents. Hence it is important to understand the effects of the superimposition
between the predominant M2 and other tidal constituents. In this study, we apply a linear analytical model to the
Guadalquivir estuary in Spain for given different tidal constituents (M2, S2, N2, O1, K1) imposed independently at the
estuary mouth. Although the linear model cannot reproduce the internal generation of overtides by means of nonlinear
interactions among the different modes, however it is able to reasonably capture the correct wave behavior (i.e., wave
damping and celerity) for the different tidal constituents. To this end, a correction factor needs to be used for frictional
dissipation to adjust the linearized friction term accounting for the interaction of the minor constituents (e.g., S2, N2, O1,
K1) with the predominant tide. The underlying mechanism is explored with a simple conceptual model, where this
interaction is analyzed by assuming that the effect of the velocities of the different tidal constituents can be summed up
in the friction term.
File Size : 419,135 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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