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HYDROLOGIC SYSTEMS

HYDROLOGIC SYSTEMS - HYDROLOGIC SYSTEMS WATER(H 2 O...

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Unformatted text preview: 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 * Properties of water: * occurs in all 3 states of matter at the T° found on earth * undergoes phase changes ** HYDROLOGIC CYCLE * evapotranspiration * condensation * 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 surface, & thus landform development (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?...
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HYDROLOGIC SYSTEMS - HYDROLOGIC SYSTEMS WATER(H 2 O...

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