Here's is a method.    Use the pen tool, and in line mode, draw a horizontal line. Give the stroke some thickness, and then use the pressure setting control to taper on end. Use the transparency tool to fade the stroke away in the direction of the taper.   Duplicate the line, move the duplicate straight down, and repeat the duplication as much as you want. Its called power duplication. The result will quickly be a vertical series of evenly spaced lines. These can then be moved together to near the coast line. W. shift held down for constraint, shift each to the coastline.   Will be tedious. Many are waiting for a "blend" tool which will replicate an object along a path. At present, there are some cases where symbol fonts can be used to conform to a text path. Unfortunately, I don't know of a way to get that to work in this situation.