form when there are differences between wave height in nearshore zone
water levels in areas with higer waves are greater than areas of lower waves, resulting in the head of water thatinduces gravity flow of water towards area of low waves.
two opposing longshore currents meet close to shore and then flow seawards as a rip current.
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longshore currents/ longshore drift
flow parallel to shore and transport sediment along coast.
longshore drift= laterial movement of sediment along beaches.
swah comes onto beach parallel to the prevailing wind
backwash pulls sediment out to sea at right angles to the swash, creating a zig zag movement along the beach and coastline.
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