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.
In the shore zone, a longshore current runs parallel to the shoreline to also carry sand along the sea bottom (longshore drift). The combination of beach drift and longshore drift is referred to as littoral drift. Littoral Drift How waves move sediment by littoral drift.(a) Swash and backwash move particles along the beach in beach drift. (b) Waves set up a longshore current that move particles by longshore drift.ittoral Drift How waves move sediment by littoral drift. (a) Swash and backwash move particles along the beach in beach drift. (b) Waves set up a longshore current that move particles by longshore drift.