Currents and wave actions are known to affect the seafloor, through eroding or depositing sediment. Often the seafloor undergoes change during large dynamical events, that include but are not limited to storm surges from tropical cyclones, river flood events generating hyperpycnal flows, density cascading generated from land-sea shelf dynamics, fluid muds generated by storm down-welling dynamics, internal tides impacted shelf-slope boundaries, alongshore and shelf resuspension transport under storm events, and sediment failure leading to transport by debris flows and turbidity currents. The talk will review these phenomena with a view to missing data and needed studies.