Abstract
The evolution of coastal landforms on tropical Pacific islands has been influenced jointly by changes in relative sea level and by shoreline sediment dynamics. During human occupation of Pacific Oceania, changes in sea level have reflected a monotonic hydro-isostatic drawdown in regional sea level following a mid-Holocene highstand in eustatic sea level, and varied patterns of tectonic uplift or subsidence affecting individual islands or island groups. Wave erosion has altered some bold coastlines, but the dominant trend of paleoshoreline evolution along lowland coasts has been the expansion of coastal plains by the accretion of successive beach ridges to island cores as regional sea level gradually fell. Anthropogenic impacts on island landscapes have influenced strandline sedimentation by enhancing sediment delivery to island coasts in response to inland deforestation.
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