What 2 processes contribute to longshore drift?
What 2 processes contribute to longshore drift?
A longshore current develops where waves approach the shore at an angle, and swash and backwash on a beach move sediment along the shore. The combined effect of these two processes is sediment transport by longshore drift.
How does longshore transport occur?
Longshore transport refers to the cumulative movement of beach and nearshore sand parallel to the shore by the combined action of tides, wind, and waves and the shore-parallel currents produced by them.
What causes longshore drift quizlet?
A longshore drift is a current moving parallel to the shore in the surf zone, caused by waves breaking at an angle with the shore.
What causes beach drift?
As wind-driven waves approach the shoreline at a slight angle, sediments are carried along the coast. Waves move sediments along the beach in a zigzag fashion (red arrows). The majority of sediment is transported in the surf zone. The movement of sand along the shoreline is known as beach drift.
What is longshore drift GCSE geography?
• Longshore drift – The zigzag movement of sediment along a shore caused by waves going up the beach at an oblique angle (Swash) and returning at right angles (backwash). This results in the gradual movement of beach materials along the coast.
Is longshore drift erosion or deposition?
Depositional features produced by longshore drift include spits, bars and tombolos. In a coastal environment, deposition results in the accumulation of sediment along or near a coastline.
What is a longshore drift and how does it move particles?
The sediment is again picked up by a wave that is coming in at an angle. So longshore drift moves sediment along the shore. This zig-zag motion can be seen in Figure below. Longshore drift carries particles of sand and rock down a coastline.
What drifts in longshore drift quizlet?
It is comprised of swash – where breaking waves move material up a beach (in the direction of prevailing wind/waves (1), and backwash – where (due to gravity) material is dragged back towards the sea (1).
What is a longshore transport quizlet?
Longshore transport moves sediment upcoast or downcoast along the beach. Longshore transport can change direction depending on which direction the waves approach the beach. Longshore transport moves sediment in a zigzag path.
Where does longshore drift occur?
Longshore (littoral) drift is the movement of material along the shore by wave action. It happens when waves approach the beach at an angle. The swash (waves moving up the beach) carries material up and along the beach.
What is longshore drift ks2?
Longshore drift is the process of the ocean currents forcing sand and other material down a beach. The material is first pulled into the currents by the backwash (the water going out to sea) and is then pushed back up the beach by the swash (the water going onto the beach).