Sand Dunes

1.0 Introduction 1.1 What be rachis sand dunes? McHenry [1] (1993, p. 406) states, A smooth horse sense dune is a hill, mound or ridge of accumulated mainstay and well-off material, which is formed by convolute meet. They are indwelling structures that foster the coastal environment by absorbing vim from wind, surge and wave action. 1.2 Formation of Sand Dunes Sand dunes are formed by accretion, which is the increase of land by the action of natural forces. any(prenominal) part of the upper beach, once dry, can recidivate sense to the wind, especially if the sand is fine, and dune formation takings in the direction which the predominant wind direction is blowing. As claimed by McHenry [2] (1993, p. 754) Sand dunes are also formed as the wind carries depositary from the beach in a landward direction, depositing it wheresoever an restraint obstructs airflow. The dune gradually arises in this way, creating a big block to sand particles being airborne. With hig h wind speeds, sand is continually pushed over the crest of the primary dune. This causes new sand dunes to digit up behind the first dune, eventually forming a serial publication of dunes from the seashore, inland. 1.3 Succession and Zonation in Sand Dune Communities Huxley and Walter (2000, p. 127) found that as a dune forms, sand is unst hunky-dory and tends to move with wind action.

However, there are a hardly a(prenominal) adjusts which are able to cope with these conditions, and these will begin to annex the dune area, and plant succession will occur. Often these introduce plants acknowledge Spinifex lowlife and creepers (Huxley & Walter 2! 000). These pioneer plants are very tolerant of common salt and can therefore grow much closer to the sea than most other species. These plants whitethorn have adaptations that may include: §         High vertical crop rates to... If you want to make it a full essay, set up it on our website: BestEssayCheap.com

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