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batemans bay field report

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Introduction

jkhgGeography Weighting: 30% Mr Brown Field work report Due: 5/4/07 By Vinny Shankar The following report was conducted using information gathered from various geological locations on the South coast of N.S.W including Bingi point, Broulee, Guerrilla bay, Bateman's bay area, South Durras area and Wasp head on Monday March 26-27 2007. The erosional and depositional features and processes caused along the coastline were observed and analysed. Erosional features and Processes The main types of Erosional processes are: * Hydraulic action * Corrasion * Attrition In addition there are many forms of weathering. * Salt weathering * Honeycomb weathering * biotic weathering Hydraulic action: This is when water (generally from powerful waves) rushes into cracks in the rockface rapidly. This traps a layer of air at the bottom of the crack, compressing it and weakening the rock. When the wave retreats, the trapped air is suddenly released with explosive force. The explosive release of highly pressurised air cracks away nbhfragments at the rockface and widens the crack itself, worsening the process so more air is trapped on the next wave. ...read more.

Middle

The area that is eroded less quickly, juts out into the sea and is called a headland. The process of longshore drift then transports the eroded material to form the beach in the bay (see diagram below) Erosion also creates the features found in a headland. The sheer force of the waves, traps air in the weaknesses in cliffs. This will eventually weaken the rock and form cracks to develop in the headland. Further erosion creates caves. The caves then erode through the cliff to form arches. The processes of weathering and erosion cause the roof of the arch to collapse and a stack is formed. Erosion also forms wave cut notches and platforms. Broulee is a good example of a rock platform. The diagram below demonstrates how waves cut notches and platforms are formed. The diagram to the left is an example of a wave cut notch Waves erode the base of cliffs by hydraulic action, abrasion and solution. ...read more.

Conclusion

Three things are required for dune formation to occur: a large supply of sand, wind speeds capable of moving it, and an ideal location for its accumulationhttp://wrgis.wr.usgs.gov/docs/parks/dune/dune.html. Factors needed for sand dune formation: * Source of abundant sand * Consistent wind * Water level (dune growth accelerated by higher water levels) * Vegetation (traps and stabilises sand) In Figure 18 (below) we can see how open beaches(withput headlands for protections) like caseys beach are more subject to erosion of the foredunes during king tides and storm events. Beaches are dynamic entities, whose shape and locations naturally vary over time. In most cases when left undisturbed by human activities, these beaches are 'self-protecting' and establish a dynamic equilibrium over time. In this case, the sand eroded from the foredune is carried a short way out to sea during the erosional events, there forming an offshore bar, which absorbs wave energy there and helps protect the beach from further erosion.Then in the weeks-to-months that follow, during low tide the sand will be blown back against the duneface, restoring the foredune to its former condition. Figure 18: Eroded Foredune (Sandy Point) ...read more.

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