Istanbul Technical University;
Department of Civil Engineering;
Maslak;
Istanbul;
34469;
Turkey;
Department of Civil Engineering;
Ahar Branch Islamic Azad University;
Ahar;
Iran;
Division of Hydraulics;
Department of Civil Engineering;
University of Tabriz;
Tabriz;
Iran;
Bedforms; Dunes; Friction drag; Turbulence; Grain roughness; Form drag;