Abstract
Sediment transport by currents and waves determines the evolution of shoals and channels on the ebb-tidal delta. The channels are an important conduit for shipping and are often dredged to maintain access at considerable cost. A better understanding of the sediment transport processes within the channels is the basis for a more cost-effective maintenance strategy. In the vicinity of ebb-tidal inlets, waves from offshore encounter tidal currents. Depending on the tidal phase, incoming waves face strong positive or negative current gradients. Besides changes in wave height, period and direction, the current gradients also affect the nonlinear wave shape and corresponding velocity profile.
Highlights
Sediment transport by currents and waves determines the evolution of shoals and channels on the ebb-tidal delta
Velocity skewness and asymmetry and the timing of the sediment suspension events determine whether waves lead to a net onshore or offshore transport. As these characteristics are likely to vary with the magnitude and direction of the tidal currents, the contribution of wave-induced sediment transport to the total transport is expected to vary with the tidal phase
On the contrary, during flood de tide propagates in the same direction as the waves, resulting in longer, lower and milder waves. This will have a clear influence on the combined wave and tidal velocity profile over the vertical
Summary
INTRODUCTION Sediment transport by currents and waves determines the evolution of shoals and channels on the ebb-tidal delta. A better understanding of the sediment transport processes within the channels is the basis for a more cost-effective maintenance strategy. In the vicinity of ebb-tidal inlets, waves from offshore encounter tidal currents.
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