KARST LANDSCAPES

KARST LANDSCAPES - KARST LANDSCAPES * Groundwater - 2nd...

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KARST LANDSCAPES *** Groundwater --- 2nd largest potential source of freshwater (22%) --- accumulates by percolation through the soil --- passes through the zone of aeration, a permeable layer --- collects in the zone of saturation, which is above an impermeable layer --- the water table is the upper limit of the zone of saturation --- this zone of saturation is an unconfined aquifer, with a permeable layer above & an impermeable layer below --- a confined aquifer has an impermeable layer above & below it --- may develop other features: * artesian well confined aquifer * spring Unconfined aquifer * stream ( where the water table crosses the surface *** KARST : a type of landscape associated with the chemical erosion of soluble limestone (CaCO 3 rich) or dolomite (CaMg[CO 3 ] 2 ) * water is a key ingredient ; no water, no limestone= no karst * May occur at or below the surface ** Basic Process: * Carbonation : reaction of carbonic acid with minerals * the H 2 CO 3
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KARST LANDSCAPES - KARST LANDSCAPES * Groundwater - 2nd...

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