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Embed code for: 10. Coastal zone
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Wednesday, 26 October 2016
The coastline itself consists of a series of different zones where specific conditions prevail that depend on factors such as tides, wave action and the depth of the sea.
This is the area between the high water mark (HWM) and the landward limit of marine activity.
Changes normally take place here only during storm activity.
The Foreshore is the area lying between the HWM and the low water mark (LWM).
It is the most important zone for marine processes in times that are not influenced by storm activity.
Inshore is the area beyond the point where waves cease to impact upon the seabed and in which activity is limited to deposition of sediment.
Swash zone: the area where a turbulent layer if water ashes up the beach following the breaking of a wave
Nearshore is the area extended seaward from the HWM to the area where waves begin to break. It includes the following:
Surf zone: the area between the point where waves break, forming a foamy, bubbly surface, and where the waves then move up the beach as swash in the swash zone.
Breaker zone: the area where waves approaching the coastline begin to break, usually where the water depth is 5 to 10m.
A ridge of sand, shingle or mud built on the sea bed in the surf zone by waves and currents, generally parallel to the shoreline and submerged by low tides.
Longshore troughs are elongated depressions that are located on the landward side of the longshore bar.
A berm is a nearly horizontal plateau in the backshore. Berms are naturally formed by the deposition of beach material by wave action.
A sand or shingle bar above the HWM parallel to the shoreline usually formed during storm conditions.
Produce an annotated cross section of the coastal zone describing it’s main features and suggesting possible reasons for their creation