Abstract
Wave-average area morphologic change numerical modelling system, CST3D, is adopted to reproduce tombolo and salient evolution behind a detached breakwater at a laboratory. The numerical wave-average morphologic model equips the beachface slope controlling method. Beachface slope varies between two extreme values for erosion and siltation modes. The beachface slope is checked every time step, and the morphology at the beachface and flat surf terrace is modified, if necessary. The model system reproduced tombolo and salient evolution for 2 cases of Ming and Chiew’s experiments. Model results implies the length of the detached emerged structure plays an important role on formation of tombolos.
Highlights
Tombolo or salient plays an important role to control coastal morpology
Ming and Chiew [16] carried out laboratory experiments on salient or tombolo formation starting from plane-sloped beach, and presented their experimental results; results was divided into tombolos, salients, and no form
Computed shoreline evolution for the two cases of Ming and Chiew’s experiments reproduced measurements satisfactorily. Both tombolo and salient cases were successfully simulated by the model system CST3D adopting the present beachface slope controlling method, and it is believed that model results improve our understanding of the difference between tombolo and salient
Summary
Tombolo or salient plays an important role to control coastal morpology. Shoreline change is of great interest to many coastal engineers. There have been a few trials to model shoreline retreat within wave-average area modelling approach These include the diffusion method [5], the wet-dry cell method [6], and the cut-cell method [6]; these lack capabilities of simulation of shoreline advance. Another group of trials modelled shoreline advance as well: the fixed profile method [7], the coupling area-line method [8,9,10] and area-crossshore-alongshore transport coupling method [11,12,13]. A new method with management of the beachface slope to simulate the shoreline evolution of arbitrary shape within an area morphological model is proposed here
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