Coastal Landforms and the Processes
By: Jaimee Watson and Sarah James
Different types of erosion:
Corrosion
Corrosion is the gradual destruction of materials, usually metals, by chemical reaction with its environment. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as oxygen. Rusting, the formation of iron oxides, is a well-known example of electrochemical corrosion.
Abrasion
Abrasion is a geographical term for the process of mechanical erosion of a rock surface caused when materials are transported across it by running water, glaciers, wind, waves or gravitational movement downslope, for example, the wearing away of fine particles of rock on a river or seabed by a sandpapering action, causing it to collapse and form a dip in the bed.
Attrition
Attrition is a form of coastal or river erosion, when the bed load is eroded by itself and the bed. As rocks are transported downstream along a riverbed, the regular impacts between the grains themselves and between the grains and the bed cause them to be broken up into smaller fragments. This process also makes them rounder and smoother. Attrition can also occur in glaciated regions, where it is caused by the movement of ice with embedded boulders over surface sediments.
Hydraulic Action
Hydraulic action occurs when the motion of water against a rock surface produces mechanical weathering. Most generally, it is the ability of moving water (flowing or waves) to dislodge and transport rock particles. Within this rubric are a number of specific erosional processes, including abrasion, attrition, corrasion, saltation, scouring, and traction.[citation needed] Hydraulic action is distinguished from other types of water facilitated erosion, such as static erosion where water leaches salts and floats off organic material from unconsolidated sediments, and from chemical erosion more often called chemical weathering
Humanities Beach Excursion 2013
Monday, May 6, 2013, 08:30 AM
Noosa National Park and Sunshine Beach
Knowledge gainned on the excursion
We learnt about all of the different types of erosional processes and that they didn't just occur on the beach, they also occurred on rock.
We learnt the most common form of erosion witch was, Hydraulic action.
We also learnt what a berm, swash zone, Gutter, Frontal dunes and Secondary Dunes.