Beach
- Beaches form between the high& low water marks is planed by waves.
- All beaches have a gradient towards the sea.
- It varies with the size of the sediment, with gravel beaches being the steepest.
- The beach sediment may vary from gravel in exposed locations with high sediment supply.
- Sheltered locations are;
-Mineral
-Shell sand
-Mud
- The beach surface is rarely absolutely flat.
- Generally has swales and berms.
- In exposed locations, storm beaches typically form a sequence of ridges.
- Once formed, the beach may be raised above sea level;
-The ocean volume falls.
- The elevation of the now raised beach will depend on the balance between land movements and sea level change.
- The changes in sea level on a coast are complex & vary in time and space.
- A wave-cut platform raised above the shoreline by a relative fall in the water level.
Raised Beach
- A raised beach called as;
-Marine terrace
-Perched
- There are beaches or wave cut plat forms raised up to shore line.
- Coastal uplift and Quaternary sea-level has resulted in the formation of marine terrace sequences.
- They were formed during separate inter-glacial high stands.
- The slope inflection between the marine abrasion platform and the associated paleo sea-cliff.
- The shoreline angle represents the maximum shoreline of a transgression and a paleo sea level.
No comments:
Post a Comment