Black cliff folded sandstone and siltstone at hallett

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Black Cliff folded sandstone and siltstone at Hallett Cover), the erosion rate is very slow. Movement of eroded sand and other sediment (longshore drift): In Adelaide, the movement of coastal sand and sediment on the beach is north. This movement is called longshore drift. The prevailing winds through Adelaide are easterly in direction. Through the process of Ekman Transport and refraction, this creates a movement of water and waves in a northerly and north-easterly direction respectively. Combined with the swash following the direction of the waves and current, and the backdrop of water, the sand moves in a zig-zag fashion along the beach; so thee net movement of the sand is north.
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Humans can be also be considered as agents in speeding up the process and intensifying the effects of coastal erosion. Here is a list of the ways by which humans accelerate coastal erosion process: Removal of vegetation cover exposing sediment to wind and water action. Concentration of drainage water flow into the sea causing erosion of that part of the coast. Construction of structures including coastal erosion control structures that interfere with the natural flow of coastal materials, causing erosion in adjacent areas of the shore. Building activities that damage natural protective features. Activities which destroy natural protective features such as dunes and vegetation cover. Shipping and boating activities producing extra wave action.
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1. Loss of Habitat/beach and landscape quality. 2. Loss of buildings, infrastructure facilities such as roads and power lines. 3. Degradation of coral reefs due to deposition old silt. 4. Increased turbidity of water. 5. Reduce the tolerance to face natural hazards such as Tsunamis.
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