Coastal Erosion and Management

What is the primary mechanism responsible for the movement of sediment along the coastline?

• Swash and backwash

• Tidal currents

• Longshore drift

• Seawalls

Which terms describe the onshore and offshore movements of water on a beach?

• Ebb and flow

• Swash and backwash

• Inflow and outflow

• Crest and trough

How do tidal movements contribute to coastal erosion?

• They deposit sediment on the shore.

• They create groynes.

• They increase longshore drift.

• They influence water levels and currents.

What is the purpose of groynes in coastal management?

• To prevent sand deposition

• To facilitate sand dredging

• To control longshore drift

• To enhance swash and backwash

How do seawalls impact coastal erosion?

• They accelerate erosion.

• They reduce the impact of waves.

• They promote sand deposition.

• They have no effect on erosion.

What is the primary goal of sand dredging in coastal areas?

• To promote erosion

• To protect dunes

• To maintain navigable waterways

• To create seawalls

How does sand deposition contribute to coastal stability?

• By reducing beach width

• By increasing erosion rates

• By providing a natural buffer

• By promoting longshore drift

What role do dunes play in preventing erosion?

• They accelerate erosion.

• They act as barriers against storm surges.

• They hinder longshore drift.

• They have no impact on erosion.

Which of the following is a human intervention for managing coastal erosion?

• Tidal movements

• Seawalls

• Natural sand deposition

• Dune formation

What are the potential challenges for managing coastal erosion in the future, considering natural processes and human activities?

• Increased reliance on longshore drift

• Overreliance on seawalls

• Decreased tidal movements

• Deterioration of groynes