what is swash
Swash, in geography, is known as a turbulent layer of water that washes up on the beach after an incoming wave has broken.The swash action can move beach materials up and down the beach, which results in the cross-shore sediment exchange.The time-scale of swash motion varies from seconds to minutes depending on the type of beach (see Figure 1 for beach types).he berm is the relatively planar part of the swash zone where the accumulation of sediment occurs at the landward farthest of swash motion (Figure 2). The berm protects the backbeach and coastal dunes from waves but erosion can occur under high energy conditions such as storms.