Although field observations of sudden spillway releases highlighted strong aeration of dam break wave flows, no study investigated these two-phase flow characteristics. New original experiments were conducted down a 24 m long stepped waterways. Dam break wave propagation showed an equivalent flow resistance similar to steady flow conditions (f ~ 0.05). Detailed unsteady air-water flow measureme...

Undular bores and shocks generated by dam-break flows or tsunamis are examined considering nonhydrostatic pressure and dispersive effects in oneand two-horizontal-dimensional space. The fully nonlinear Boussinesq-type equations based on a weakly nonhydrostatic pressure assumption are chosen as the governing equations. The equation set is solved by a fourth-order accurate finite-volume method wi...

Among others, dam-break waves are a common representation for tsunami near- or on-shore as well large storm riding on top of surge water levels at coasts. These extreme hydrodynamic events frequent cause destruction and losses along coastlines worldwide. Within this study, propagated over composite bathymetry, consisting linear slope an adjacent horizontal plane. The wave propagation the its su...