Abstract
Kasuga (2006) has been measuring the lakeshore elevation at a point in front of the seawall at Ohyama region in Lake Kasumigaura once a day since 1993. Due to this observation, the elevation at the point showed a strong periodicity of a year. To investigate the cause of the changes, original data taken by Kasuga was analyzed as well as seabed sounding and sampling test of seabed materials. Wave forecasting and numerical simulation using the contour-line-change model was carried out. It was found that this periodic variation of the elevation was induced by the seasonal changes in direction of longshore sand transport on a pocket beach between a drainage gate and lakeshore plants.
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