The change in sand volume is a fundamental indicator of island stability and an important measure used in determining directions and rates of sediment transport. Figure 1 (below) shows the changes in volume that were computed from the two island-wide surveys (May, 2002 and January, 2003) at each of the 111 profile stations.

The above profile stations represent 2-D slices through the beach and offshore regions along 111 transect lines that were previously established. We have attempted to gain additional insight into volumetric changes by constructing a beach and offshore cell-based network along the entire island. This allows us to 3-dimensionally map morphologic changes in geometry and volume. Figure 2 (below) illustrates morphologic change between the May 2002 and August 1002 surveys.