BEACH EROSION DUE TO LARGE COASTAL STRUCTURE AND ITS CONTROL

Yoshito Tsuchiya, Takao Yamashita, Richard Silvester

Abstract


Beach erosion has recently been recongnized as accelerating due to the influence of coastal structures. This tendency is especially severe in Japan where coastal structures are over abundant. Blockage of the longshore sediment transport and changes in the wave field are the most common causes of structure induced beach erosion. In this paper, these are indentified as the first and second causes of erosion. Examples of such beach erosion in Japan are provided. In order to explain the two common erosion causes and beach erosion control, results of numerical simulations of shoreline change by a coastal structure and nearshore currents due to wave fields changed are also shown. In the numerical simulation, a countermeasure for beach erosion which is caused by changing of nearshore currents by the coastal sturcture is proposed.

Keywords


erosion; beach erosion; structure induced erosion

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