Abstract
This paper is concerned with a numerical model of nearshore currents using one-equation turbulent model. In this study, a quasi-two dimensional model was proposed and applied to the vertical circulation in the surf zone. The present model was calibrated and verified by comparing with laboratory tests. First, the relationships among the vertical distribution of the turbulent length scale, eddy viscosity coefficient and undertow was investigated by comparing with the data measured in the small wave tank. Secondly, the present model was applied to undertow velocity measured in the large scale wave tank. Finally, the applicability of the present model was discussed
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