Hydrodynamics and sediment transport under a dam-break-driven swash: An experimental study

An experimental study is presented consisting of swash zone hydrodynamics, sediment transport flux estimates, and bed changes under a single dam-break-driven event over steep (1:7), movable sand bed. The provides resolved measurements instantaneous water depths, cross-shore flow velocities, sheet suspended concentrations, morphological response. ensemble-averaging 24 repetitions the allows convergence in time-averaged measured quantities. profile was re-constructed after each run with re-smoothing procedure that allowed for minimum variations are within profiler system accuracy (<0.006 m). High-resolution employed to reconstruct spatial-temporal evolution velocity field. Temporal extrapolation spatial logarithmic/exponential fits fill gaps data estimation depth-integrated flux. gradients indicate dominates load during most relevant phases transport. Upon bore arrival initial uprush, relative contribution larger than backwash phase decreasingly dominant onshore. Depth-integrated total based on two different approaches, compared equivalent estimates obtained from observed continuity equation. close agreement between various approaches indicates existing models empirical concentration can be used as first order zone.