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-Presence of vegetation; this favors parabolic dunes occurrence.
-The rate of sand supply; depending on the amount of sand supplied there may occur longitudinal dunes/barchans or transverse barchans/dunes.Transverse results due to large sand supply while, longitudinal barchans results due to large sand supply.
-Wind; this results to either barchan or star dunes where the barchan results due to unidirectional wind.
-Flash floods; leads to creation of faster moving but short lived streams with eroded steep sided canyons that deposit alluvial fans mainly in flat areas where many alluvial fans coalesce.
jim items answered the question on November 16, 2018 at 18:37
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