RESULTS

The calculated CVI values for CACO range from 6.71 to 36.62. The mean CVI value is 14.15; the mode is 6.71; and the median is 12.7. The standard deviation is 7.57. The 25th, 50th, and 75th percentiles are 7.3, 12.0, and 17.0, respectively.

Figure 11 shows a map of the coastal vulnerability index for the Cape Cod National Seashore. 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 7.3 are assigned to the low vulnerability category. Values from 7.31 to 12.0 are considered moderate vulnerability. High vulnerability values lie between 12.1 and 17.0. CVI values above 17.0 are classified as very high vulnerability. Figure 12 shows a histogram of the percentage of CACO shoreline in each vulnerability category. Approximately 55 miles (88 km) of shoreline is evaluated along the national seashore. Of this total, 24 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, 26 percent as moderate vulnerability, and 24 percent as low vulnerability.