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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Analytical approach to long-term coarse sediment transport in estuaries
Analytical approach to long-term coarse sediment transport in estuaries
Author : Ao Chu1,2 Jia’ai Tai1
Abstract
Van de Kreeke and Robaczewska (1993) have nicely concluded that the long-term coarse sediment
transport is only determined by three terms, i.e. the interactions (M0 & M2), (M4 & M2) and the
triple interaction (M2, M4 & M6). Their conclusions pertain to transport of coarse sediment by the
astronomic tide including the tidal-induced negligible mean current. However, in most estuarine
environment, the mean current is induced not only by the tides but also river discharges. Thus, the
approximate approach by van de Kreeke and Robaczewska (1993) is verified against situations
with and without residual current in the present study. The underestimation of this expression has
been found when the residual current is accounted. Therefore, the approximate expression is
re-derived following the approach by van de Kreeke and Robaczewska (1993) except the higher
order terms included. The new expression for the long-term net coarse sediment transport by tides
reveals that the interactions (M0 & any present tidal current constituent) and the triad interactions
(M2, S2 & MS4) and (M2, N2 & MN4) also contribute to the long-term net coarse sediment
transport, in addition to the three terms presented by van de Kreeke and Robaczewska (1993). The
underestimation of the previous expression is due to the neglecting of the higher order terms
contributed by the interactions involving M0 and any present tidal current constituents. Although
these higher order terms are negligible in most time, their contribution to the long-term net coarse
sediment transport can be remarkable in estuarine environment.
File Size : 471,271 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 18/08/2015
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