The dam-break on granular-bed means the collapse of a static vertical water column on a rough moveable-bed. The purpose of this study was to determine the efficiency of analytical and volume of fluid (VOF) as an Eulerian method in predicting positivewave behavior due to dam-break on granular substrates. The numerical simulations were implemented using commercial CFD-packages. While, in VOF method, the turbulence models, including Reynolds averaged Navier-Stokes (RANS), large eddy simulations (LES) as well as shallow-water equations (SWE) were used. Subsequently, the findings indicated that kinematic characteristics of dam-break wave and bedscouring features are a function of initial height of water column of the reservoir as well as material characteristics. In this regard, material characteristics are roughness, specific density, diameter, friction angle, mobility and Shields’ parameter
