Results

Figure 11. Relative Coastal Vulnerability for GGNRA. Click on figure for larger image.

The CVI values calculated for GGNRA range from 2.83 to 16.00. The mean CVI value is 7.257; the mode is 4.00 and the median is 6.32. The standard deviation is 3.27. The 25th, 50th, and 75th percentiles are 4.4, 6.25 and 9.8, respectively.

Figure 11 shows a map of the coastal vulnerability index for GGNRA. The CVI scores are divided into low, moderate, high, and very high-vulnerability categories based on the quartile ranges and visual inspection of the data. CVI values below 4.4 are assigned to the low vulnerability category. Values from 4.4 to 6.25 are considered moderate vulnerability. High-vulnerability values lie between 6.26 and 9.8. CVI values above 9.8 are classified

Figure 12. Percentage of GGNRA shoreline in each CVI category. Click on figure for larger image.

as very high vulnerability. Figure 12 shows the percentage of GGNRA shoreline in each vulnerability category. Nearly 95 km (59 miles) of shoreline is evaluated along GGNRA. Of this total, twenty-four percent of the mapped shoreline is classified as being at very high vulnerability due to future sea-level rise. Twenty-six percent is classified as high vulnerability, twenty-six percent as moderate vulnerability, and twenty-four percent as low vulnerability.