. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 119 surface of Nabiligaa and promoted loss of 80% of the island vegetation (approximately 1,600 m2). The cay footprint (denoted by the toe of beach) increased in area by 17% occupying a further 9,729 m2 of reef surface compared with pre-tsunami surveys. These changes in island footprint suggest the tsunami wave spread the reservoir of cay sediment across a broader area of reef than identified in earlier surveys. Scarping was measured along one quarter of the western shoreline whereas overwash deposition buried
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 119 surface of Nabiligaa and promoted loss of 80% of the island vegetation (approximately 1,600 m2). The cay footprint (denoted by the toe of beach) increased in area by 17% occupying a further 9,729 m2 of reef surface compared with pre-tsunami surveys. These changes in island footprint suggest the tsunami wave spread the reservoir of cay sediment across a broader area of reef than identified in earlier surveys. Scarping was measured along one quarter of the western shoreline whereas overwash deposition buried vegetation along the eastern margin of the island, reaching a maximum depth of m. Boifushi (Figure 12 ). Boifushi was the only unvegetated sand cay included in the study. Observations of the cresent-shaped cay indicate the tsunami waves swept over the surface depositing sediments to the west (Fig. 12). While the total area occupied by the cay footprint was reduced by about 10% the discrete mass had migrated up to 20 m southwestward covering 2,500 m2 of reef surface that had previously not been covered with cay sediments. However, all of our surveys show that the sand cay is mobile both between seasons and between years and the magnitude of the tsunami-induced movement was not exceptional. Fig. 10 Mendhoo. Fig. 11 Nabiligaa. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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