Coastal Management and Longshore Drift

The video explains longshore drift, a process where beach materials are transported along the coast by the action of swash and backwash, influenced by prevailing wind direction. It provides examples of longshore drift moving in different directions and discusses coastal management strategies like groins, which prevent sediment movement but can cause erosion elsewhere. A case study of Hornsea illustrates the effects of groins on sediment distribution and beach erosion.

What is the primary factor that determines the direction of longshore drift?

• The temperature of the water

• The prevailing wind direction

• The type of beach material

• The shape of the coastline

What is the effect of longshore drift on the beach material?

• It causes the material to sink

• It transports the material along the beach

• It makes the material heavier

• It changes the color of the material

How does swash contribute to the process of longshore drift?

• By picking up sediment and moving it along the beach

• By depositing sediment on the beach

• By creating waves that move parallel to the shore

• By eroding the beach

In the example of longshore drift moving from east to west, what is the role of backwash?

• It deposits sediment on the beach

• It moves sediment back into the sea at a right angle

• It stops the movement of sediment

• It creates new waves

What happens to the direction of longshore drift if the prevailing wind direction changes?

• It speeds up

• It reverses direction

• It remains the same

• It stops completely

What is the main purpose of using groins in coastal management?

• To increase the speed of longshore drift

• To create new beaches

• To prevent sediment from moving down the beach

• To enhance wave energy

What is a potential negative effect of using groins on a coastline?

• They increase the amount of sediment on all beaches

• They cause erosion on the side of the groin where sediment is not replenished

• They stop all wave activity

• They make beaches narrower

How do groins affect the width of beaches on their updrift side?

• They make them narrower

• They have no effect

• They make them wider

• They cause them to disappear

What is the impact of groins on beaches located further down the coast?

• They receive more sediment

• They become protected from waves

• They become more stable

• They experience increased erosion

In the case study of Hornsea, what was the main reason for implementing groins?

• To increase tourism

• To prevent longshore drift and manage erosion

• To create new habitats

• To enhance fishing activities