Results

Figure 14. Relative Coastal Vulnerability for Channel Islands National Park.

The CVI values calculated for Channel Islands range from 3.46 to 18.97. The mean CVI value is 8.86; the mode is 5.66 and the median is 9.80. The standard deviation is 3.97. The 25th, 50th, and 75th percentiles are 5.75, 8.25 and 14.0, respectively.

Figure 15. Percentage of Channel Islands National Park shoreline in each CVI category.

Figure 14 shows a map of the coastal vulnerability index for Channel Islands National Park. 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 5.75 are assigned to the low vulnerability category. Values from 5.75 to 8.25 are considered moderate vulnerability. High-vulnerability values lie between 8.26 and 14.0. CVI values above 14.0 are classified as very high vulnerability. Figure 15 shows the percentage of Channel Islands shoreline in each vulnerability category. Over 400 km (250 miles) of shoreline is evaluated along the Channel Islands National Park. Of this total, twenty-five percent of the mapped shoreline is classified as being at very high vulnerability due to future sea-level rise. Twenty-eight percent is classified as high vulnerability, nineteen percent as moderate vulnerability, and twenty-eight percent as low vulnerability.