An ocean current that flows parallel to the coast is called a longshore current. Large waves that crash against the shoreline at an angle and force water down the length of the beach in one direction are what produces it.
This sheet of water can "catch" and carry beach debris back out to sea as it flows on and off the beach. Longshore drift is a mechanism that may significantly erode a shoreline.
In a "sheet-like" arrangement, water in a longshore current moves up the beach before returning to the ocean. This sheet of water can carry beach sand back out to sea as it passes over and off the beach.
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