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[B-10.4.2 A Study of Impact Sea Level Rise for Islands Beach Changes]

[Contact Person]

Takaaki Uda and Hiroyuki Ito
Public Works Research Institute, Ministry of Construction.
1 Asahi, Tsukuba, Ibaraki 305 Japan
Phone +81-298-64-2211(Ext.475), Fax +81-298-64-1168

[Total Budget for FY1991-1992]

7,836,000 Yen

[Abstract]

　The formation and disappearence mechanisms of a sand cay were studied by a wave flume movable bed experiment. There is an optimum water depth for the formation of the maximum berm on the reef. Whereas the erosion rate of the sand cay rapidly increases when the water depth relative to the wave height on the reef exceeds a critical value. The topographic changes of a sand cay due to wave action under the changing sea level condition were studied by a sand bed experiment The beach changes were caused mainly be the longshore sand transport in the low sea level condition, whereas in high sea level condition the overtopping flow becames very important. These results well agree with the observed data in the field.

[Key Words]

Coral reef, Sand cay, Sea level rise, Shore protection