Muriwai Information

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Formation of the Land
Geomorphologic Processes
This is about how the Muriwai Coastal Environment (M.C.E.) land has been created and shaped over time. I.e. it’s all about Rocks! The west coast’s geomorphology has been influenced by tectonic processes (rocks), alluvial processes (water) and climatic processes (weather).

Hydrological Processes
Hydrological Processes refer to water.
Waves are continually affecting Otakimiro Point (i.e. the Headland).
At Muriwai, waves are responsible for shaping the coast everyday (and night!). Hydrological Vocab
* The movement of waves back down the beach.
* The movement of waves up on to the beach.
* These occur on shores with a steeply angled shore. The waves curl over and crash loudly. They are destructive. * These occur on shores with a gentle angled shore. The waves spill over. They are constructive. * The process by which the direction of a wave is changed when it moves in to shallower water. * The energy of water impacting on a cracks and joint. Air is compressed into the space, leading to erosion. * When particles of sand or rock further abrade the rock surface. * When the waves wear away at the base of a cliff, often forming a notch. * The wearing a way of rocks after they have been removed from the cliff face. * The distance a wave travels without interruption

WAVES
The Power of the Sea
Waves are formed by energy of the wind blowing over long ocean distances. Waves at M.C.E.
The size of a wave is determined by;
* The strength of the wind
* The amount of time the wind has been blowing
* The fetch
Winds are often over 16kph and S.W in direction. Waves that reach Muriwai Coastal Environment have travelled from Australia.

Wave refraction
This is the process by which waves undergo a change of direction as they approach headlands and beaches

* The force of the waves are concentrated on the headland and the waves bend (refract) around it. * Refraction is caused by the shallower water in front of the headland dragging the waves. * Energy is concentrated on the headland.

* Waves are often plunging.
* (The waves reaching the beaches/bays are weaker due to energy being expended on the headland) Waves as agents of change
WAVES HIT AGAINST THE CLIFF FACE
* Hydraulic action – the force of the waves compress air in cracks, gradually loosening material * Wave pounding – waves breaking at the base of a cliff generate shock waves. Over time this weakens and erodes the rock WAVES MOVE LOOSE MATERIAL

* Corrasion / Abraision – Loose material at the base of the cliff is battered against the cliff, loosening more material * Attrition – Loose material is worn down or broken down into finer material / particles, as they are bashed against each other.

Hydrological Vocab
* The movement of waves back down the beach.
* The movement of waves up on to the beach.
* These occur on shores with a steeply angled shore. The waves curl over and crash loudly. They are destructive. * These occur on shores with a gentle angled shore. The waves spill over. They are constructive. * The process by which the direction of a wave is changed when it moves in to shallower water. * The energy of water impacting on a cracks and joint. Air is compressed into the space, leading to erosion. * When particles of sand or rock further abrade the rock surface. * When the waves wear away at the base of a cliff, often forming a notch. * The wearing away of rocks after they have been removed from the cliff face. * The distance a wave travels without interruption

Cliff Retreat
* As the coastal cliffs are cut back a shore platform is left. The width of the platform progressively increases and the waves become less able to erode the cliff as they become shallower....
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