USP Electronic Research Repository

Shoreline erosion on a low coral Island in Fiji: causes and consequences

Terry, James P. (2004) Shoreline erosion on a low coral Island in Fiji: causes and consequences. South Pacific Studies, 24 (2). pp. 55-66. ISSN 0916-0752

Full text not available from this repository.

Abstract

Yanuca Island is a 50 Ha low emerged coral limestone island, located near the south west coast of mainland Fiji in the South Pacific. Developed on the island is a international resort complex. Local Fijian land owners resort staff provide accounts of shoreline erosion on the island over recent years. An investigation into the processes responsible for this erosion found several influences were important. A comparison of air photos over the last 50 years indicates there has been significant evolution of the coral geomorphology of Yanuca Island. In the 1980s, sand mining and vegetation clearance led to instability and narrowing of the coastal sand bar at the north end of the island. Along the south, current measurements show that there is strong longshore drift, driven by the persistent southeast trade winds. This is responsible for the removal of beach deposits and the resulting exposure of underlying beachrock. The erosion problem is probably compounded by a reduction in the supply of biogenic sand from adjacent fringing reefs, due to overfishing and degradation of the reef ecosystem. Tropical cyclones have also caused much coastal erosion in recent years. Finally, a causeway connecting to the eastern side of the island has a dam effect and influences the flow of currents around the island. Consequences of beach loss and sand mobility include sediment infilling and deterioration of adjacent lagoon conditions. Several management actions to alleviate coastal erosion problems on Yanuca Island are suggested.

Item Type: Journal Article
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Geography, Earth Science and Environment
Depositing User: Ms Neha Harakh
Date Deposited: 24 Apr 2004 19:44
Last Modified: 09 May 2012 15:45
URI: http://repository.usp.ac.fj/id/eprint/3126
UNSPECIFIED

Actions (login required)

View Item