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This study focused on the morphological change in Alapi beach of Fongafale islet in Funafuti atoll, Tuvalu. Although Alapi beach is indispensable for residents, the mechanism of morphological change is not sufficiently understood because measured data of morphological change are not enough. Measurements of sandy beach's shape in Alapi using handy GPS and wave condition in lagoon were carried out by this study. Analyzed results of measured data indicated that the longshore sediment transport in Alapi beach is toward north through a year and the rare tropical cyclone has potential of rapid both northward and southward transport of sandy beach. This mechanism of morphological change becomes fundamental information for beach conservation plan in Alapi beach.

Field Investigation of Morphological Changes in Lagoonal Sandy Beach of Atoll Islands