RESULTS

The calculated CVI values for Fire Island range from 14.17 to 31.62. The mean CVI value is 26.53; the mode and the median are 27.38. The standard deviation is 358. The 25th, 50th, and 75th percentiles are 20.0, 24.5, and 28.0, respectively.

Figure 15 shows a map of the coastal vulnerability index for the Fire Island 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 20.0 are assigned to the low vulnerability category. Values from 20.0 to 24.5 are considered moderate vulnerability. High-vulnerability values lie between 24.6 and 28.0. CVI values above 28.0 are classified as very high vulnerability. Figure 16 shows a histogram of the percentage of FIIS shoreline in each vulnerability category. A total of 55 km (32 miles) of shoreline is evaluated along the national seashore. Of this total, 22 percent of the mapped shoreline is classified as being at very high vulnerability due to future sea-level rise. Thirty-six percent is classified as high vulnerability, thirty-four percent as moderate vulnerability, and eight percent as low vulnerability.