VERTICAL VARIATION OP UNDERTOW IN THE SURF ZONE

Akio Okayasu, Tomoya Shibayama, Kiyoshi Horikawa

Abstract


In order to establish a model of the vertical distribution of the undertow, laboratory experiments were performed on uniform slopes of 1/20 and 1/30. The turbulent velocity in the surf zone including the area close to the bottom was measured by using a two-component laser doppler velocimeter. The distributions of the mean Reynolds stress and the mean eddy viscosity coefficient were calculated. Based on the experimental results, a model to predict the vertical profile of the undertow was presented.

Keywords


surf zone; undertow; vertical variation

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