Randomized Controlled Studies: This is a study in which 1) There are two groups, one treatment group and one control group. The treatment group receives the treatment under investigation, and the control group receives either no treatment (placebo) or standard treatment. 2) Patients are randomly assigned to all groups.
winds that blow in a steady direction can move a dune. such wind will consistently pick up sand from one side and deposit it to a other side. this causes the entire dune to s â¦ lowly move in the direction if the wind.
Beach Drift and Swash. The longshore current is part of the longshore transport that moves sand and sediment down the coastline, but there is also another process that contributes to the longshore transport called beach drift, or longshore drift. Beach drift is defined as the progressive movement of sand and sediment along the beach.