HYDROLOGIC SYSTEMS - HYDROLOGIC SYSTEMS * WATER (H2O) *...

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HYDROLOGIC SYSTEMS * WATER (H 2 O) * originally formed within the earth & brought to surface by outgassing * collected on surface after Earth cooled some 3.8 BYBP * reached equilibrium amount, 1.36 billion km 3 , some 2 BYBP * covers 71% of earth by area * constitutes 70% of our bodies (* water is an important part of our world) * other than gravity, is the major agent of geomorphic change on the Earth's surface * Distribution * 97.22% is in the oceans & other saltwater bodies, 2.78% is freshwater * of this freshwater: 22% is groundwater, 77% is in ice & glaciers, about 1% is in freshwater lakes & ponds, rivers & streams ** HYDROLOGIC CYCLE * evapotranspiration * condensation
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* precipitation * run-off * Water Balance Precip(input) = PET -- deficit + surplus + storage * Why important? * provides adequate water supply * is a major factor in weathering processes above & below the (Increased water == increased weathering) * How? Infiltration vs runoff -- subsurface weathering -- fluvial landscapes -- regolith formation -- degradation -- karst formation -- aggradation -- overland flow FLUVIAL SYSTEMS * What is a fluvial system? * Primarily this refers to running water * rills, brooks, creeks, streams, rivers, & other water moving in a channel or watercourse
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* May be a permanent watercourse or temporary (intermittent) * In arid regions intermittent channels are also known as arroyos, waris, dry gulches, washes ect * * Running water causes erosion and transport of weathered material * in some cases standing water such as lakes or ponds are included, but carryout more weathering than transport, and are more likely to be areas of aggradation * How do fluvial systems induce change on the landscape? * 2 main processes which occur:
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This note was uploaded on 07/10/2011 for the course GEOG 1101 taught by Professor Connor during the Spring '08 term at University of Georgia Athens.

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HYDROLOGIC SYSTEMS - HYDROLOGIC SYSTEMS * WATER (H2O) *...

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