1 definition by h4Nz
In Geography, LSD is an abbreviation of Long Shore Drift. In other words, it is the movement of sediments and material along a shoreline by means of wave action. In this case the waves meet the shoreline at an angle, where the swash is greater than the backwash, thus pushing sediments along the beach in a zig-zag motion.
"The wooden groynes are build on the beach to slow down the LSD, and allow the sediments to be deposited on the beach."
by h4Nz April 20, 2006