Abstract
A one-line analytical model is introduced for prediction of shoreline changes and accumulation/erosion volumes in the vicinity of a breakwater, or a system of breakwaters on time scales from hours to years. The changes in morphology are interpreted as a consequence of two mechanisms that cause accumulation in the lee of breakwater either due to two opposite flows or due to unloading of unidirectional alongshore sediment flux. The relationships obtained reproduce the observed trend of slowing down the bottom relief evolution by approaching to the equilibrium state. Changes in shore contour are determined by means of the mass conservation law under the assumption of an initially flat bed. It is shown that the higher upstream the breakwater is, the more sediment volume it accumulates and the larger salient is formed. In the gaps between the structures, the sediment flow partly recovers causing the shoreline retreat. The length of the down-drift erosion zone is assumed proportional to the surf zone width. An example of calculations for the section of the Azov Sea coast demonstrates its response for changes in parameters of a series of breakwaters. A comparison of the model with published data confirms its applicability at least for the case of a single breakwater.
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The work was fulfilled in a scope of the Government assignment (Theme # 0128-2021-0004).
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Leont’yev, I.O., Akivis, T.M. (2023). Morphological Changes of a Sandy Beach Under Influence of a Breakwater. In: Chaplina, T. (eds) Processes in GeoMedia—Volume VI. Springer Geology. Springer, Cham. https://doi.org/10.1007/978-3-031-16575-7_48
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