Deposition Processes

Deposition occurs as a natural part of the coastal sediment transport system, involving complex interactions between waves and beach material.

Vocabulary: Swash refers to the upward movement of waves on a beach, while backwash is the return flow.

Definition: Longshore drift is the zigzag movement of beach material along the coast.

The process involves:

• Wave energy reduction leading to sediment dropping
• Angled wave approach creating longshore drift
• Interaction between swash and backwash movements

Types of Erosion

The various erosion processes work together to shape and modify coastal landscapes. Each type serves a specific function in breaking down rock materials.

Definition: Erosion is the process by which rock and sediment are worn away and transported to new locations.

Example: Attrition occurs when rocks collide and become smoother, similar to stones in a tumbler.

Vocabulary: Hydraulic action refers to the force of water entering rock cracks, causing them to expand through air compression.

The four main types of erosion include:

• Attrition: Rocks colliding and becoming smoother
• Solution: Chemical dissolution of rocks
• Abrasion: Rocks being hurled against cliffs
• Hydraulic action: Water pressure expanding cracks