THE EFFECT OF WAVE REFRACTION OVER DREDGED HOLES

J.M. Motyka, D.H. Willis

Abstract


Preliminary results are presented of a study of the beach erosion caused by wave refraction over offshore dredged holes. A mathematical model is used of an idealised sand beach, typical of those on the English Channel and North Sea coasts of Great Britain. Depth and side slopes of dredged area and original water depth before dredging were varied. Beach erosion increased with increasing hole depth and with decreasing original water depth. The effects of side slope and hole depth will be separated in future work, as will the effects of hole shape. Beach erosion due to holes in water depths greater than half the length of "normal" waves, or a fifth of the length of extreme waves, was negligible.

Keywords


dredging; reflection; dredged hole

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