Backshore: is the area between the high water mark and the landward limit of marine activity. Changes normally take place here only during storm activity.
Foreshore: is the area lying between the HWM and the LWM. It is the most important zone for marine processes in times that are not influenced by storm activity.
Inshore: is the area between the LWM and the point where the waves cease to have any influence on the land beneath them.
Offshore: is the area beyond the point where waves ceasev to impact upon the sea bed in which activity is limited to deposition of sediments.
Factors which determine the shape, form and appear
- Wave size, frequency, type, energy produced and direction
- Local sea currents
- Longshore Drist
- Depth of water offshore
- Type and amount of sediments offshore
- Rock type and structure
- Sub-aerial Processes (run-off, weathering)
- Land-based agents of erosion (rivers, glaciers)
- Long-term sea level change
- Human activity
- Coastal Ecosystems ( san dunes, salt marshes)