Changes in shoreline contour due to cross-shore structure in the sea coastal zone

I. O. Leont’yev

doi:10.7868/S0435428118030033

Changes in shoreline contour due to cross-shore structure in the sea coastal zone

I. O. Leont’yev

https://doi.org/10.7868/S0435428118030033

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Abstract

A model is suggested to predict the shoreline changes in the vicinity of coastal structures of the type of jetty, cofferdam or groin. Input data comprise the characteristics of coastal profile, dimensions of structure and the annual alongshore sediment fluxes. Shoreline contour from each side of the obstacle is described in general by a concave curve. Mean shoreline displacement A is proportional to the sediment volume trapped by a structure. Extension Λ of the area where the structure influences the shoreline contour depends on both the length of structure and the width of sediment flux. Displacement A and the length Λ tend to increase with the time t in proportion to √t . Verification of the model is based on the published data on shoreline changes due to a jetty protecting a navigational channel or a port basin. An example of model calculation is given.

Keywords

shoreline contour, cross-shore structure (jetty, groin, cofferdam), zone of structure influence, longshore sediment flux, shoreline displacement, accretion, erosion

About the Author

I. O. Leont’yev

Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow
Russian Federation

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Review

For citations:

Leont’yev I.O. Changes in shoreline contour due to cross-shore structure in the sea coastal zone. Geomorfologiya. 2018;(3):32-39. (In Russ.) https://doi.org/10.7868/S0435428118030033