i10hcsoils - The hydrologic cycle Earth is a moist planet...

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1 The hydrologic cycle • Earth is a moist planet • Average annual precip: 39 inches • Water balance – P=I+AE+OF+ SM+ GW+GWR • I: interception • AE: Actual evapotranspiration – Evaporation + transpiration = evapotranspiration • OF: Overland flow SM: Change in soil moisture GW: change in ground water storage • GWR: ground water runoff • Evaporation – From water surfaces – From soil (~ 1 st ½ meter) Ti t i • Transpiration – By plants – Usually > evaporation rate • Water uptake by (deep) roots • Potential evapotranspiration (PE) – Quantity of water that could be lost given inexhaustible water supply Actual evapotranspiration (AE • Actual evapotranspiration (AE) – True amount of water lost • Moisture deficit AE P PE
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2 • 2 types of hydrologic environments – Moisture abundant • Open water (lakes, streams) • Moisture-holding soil – Moisture limited • Arid zones: little precip., high evaporation • Fast water removal – Urban (runoff from impervious surfaces) – Mountains (rock covered) – Sandy areas (infiltration, e.g. soils) Soils • Soil = f( water, time, climate, vegetation/fauna, human activity, topography, geology) Properties • Properties – Composition –Texture – Structure – Colour Composition • Collection of particles from erosion,
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i10hcsoils - The hydrologic cycle Earth is a moist planet...

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