in order to enhance the advective processes and accelerate the morphological evolution of the
dominant features.
Runs with no magnification of the sediment transport rates produced
qualitatively similar results with smaller changes in the bed.
Figs. 12a-12d show the time evolution of the bed every 7 days over the 28 day
simulation. Note that larger values in the bed elevation indicate erosion and lower values indicate
accretion due to the fact that the bed is measured as positive downward from the geoid. On day
7, there is noticeable erosion beginning at the southern end of the inlet. Accumulation of the
sediment can be seen along the sides of the inlet and to the south of the inlet indicating the initial
formation of an ebb shoal. During flood tide on day 14, it can be seen that there has been
significant erosion through the throat of the inlet resulting in the initial formation of a flood shoal.
It can also be seen that the ebb shoal has become more pronounced. By day 21, there are distinct
flood and ebb shoals to the north and south of the inlet respectively. There is also additional
erosion through the inlet following the same pattern as the initial scour. At the end of day 28,
there has been significant scour through the entire length of the inlet and the flood and ebb shoals
have become even more pronounced. It should be noted that even at this level of coarse grid
resolution the model captures the main morphological changes one expects to observe in tidally
dominated coastal inlets (see for example Hayes, 1980).
30
Previous Page
