As a marine science expert with extensive knowledge of ocean dynamics, I can explain the phenomenon of longshore currents. A long-shore current is an ocean current that moves parallel to the shore. It is caused by the action of waves, or more specifically, by the oblique (at an angle) approach of swells as they make contact with the shoreline. When these swells hit the shore at an angle, they create a drift of water along the coastline, which is the longshore current. This current can transport sediment, debris, and even swimmers parallel to the beach. The force exerted by the waves pushes water down the beach in one direction, and as the water can't escape, it's forced to move along the shore. Longs-shore currents typically extend from the shallow waters inside the breaking waves to the deeper waters outside the breakers. read more >>

A long-shore current is an ocean current that moves parallel to shore. It is caused by swells sweeping into the shoreline at an angle and pushing water down the length of the beach in one direction. Longs-shore currents usually extend from the shallow waters inside the breaking waves to the outside breakers.read more >>