In order to evaluate the dominating causes of morphological response on the tidal flats, quadratic polynomial approach has been proposed for approximation of cross-shore profiles. A relationship between three parameters of the polynomial and external forces has been examined. Consequently, tidal motions are dominant for tidal flats, which have convex-upwards profiles. This result agrees with that obtained by Kirby (2000). A domination of wind waves and river discharges can become important at a time scale that is shorter than the present observation intervals. This warrants future observations at before and after both storm and typhoon conditions.
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