モルディブのLhohifushi島における海岸保全

抄録

Field observations on the nearshore currents and the formation of sandy beach around Lhohifushi island in Maldives were carried out. Aerial photographs of this small sandy island were taken to investigate the pattern of the nearshore currents induced by wave breaking on the reef. Beach situation around the island were observed. Coral sand produced by wave breaking at the reef edge is found to be gradually transported by the littoral drift caused by incident waves from SE, and on the lee side of the island a sand spit is formed. This continuous sediment transport was interrupted by the construction of the impermeable jetty, and the downcoast beaches were severely eroded. In order to solve these problems shore protection method considering the overall littoral balance of the island is important.