TIDALLY INDUCED CROSS- SHORE SAND- MUD TRANSPORT AND LONG-TERM BED-PROFILE EVOLUTION
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Date
2009
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Publisher
Journal of Sustainability Science and Management
Abstract
A one-dimensional numerical model based on the shallow-water equations, suspendedsediment transport formulae and bed-material conservation equation was developed in order to
study the morphological behaviour of idealised hump bed under cross-shore tidal current. A series
of tests were carried out for some benchmark problems, such as wave propagation and hump
morphodynamics, to validate the numerical scheme. The system of hydrodynamic equations was
solved using the finite-volume numerical scheme associated with approximate Roe's Riemann
solver, a data-reconstruction and slope limiter. Hump beds consisting of sand/mud mixtures were
examined. It was found that the predicted morphological behaviours of the hump beds under the
cross-shore tidal current for a five year period show quite similar trends and the height of humpprofiles is reduced at the top and increased at both sides. Moreover, sand content of 40 percent
produces the highest peak ofhump-bed profile. This study shows that the amount ofdecreasing and
increasing of bed-profile depends on the critical shear-stress and quantity of sand and mud in the
sediments fraction.
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Keywords
Sediment transport, shallow-water equations, morphodynamic, approximate Roe's Riemann solver