GEOL 1340 Chapter 6: GEOL Chapter 6
6 Oct 2016
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Outgassing: water and vapor emerge from layers within and below crust and released in form of gas. Eustasy: changes in sea level caused by changes in volume of water in oceans. Ice sheets and glaciers have most of freshwater. Interception: precip. on vegetation or ground cover before reaching surface. Can also occur if soil infiltrated to full capacity and is saturated. Percolation: slow passage of water through a porous substance. Soil-moisture zone: volume of subsurface water stored in soil that is accessible to plant roots. Derived from measuring input of precip. and distribution and outputs of evapotranspiration. Potential evapotranspiration (pe) is amt of water that would evaporate and transpire under optimum moisture conditions. When pe greater than ae, water demand must be met by moisture stored in soil or artificial irrigation. Deficit happens when pe can"t be satisfied by precip. inputs. Water in subsurface that is accessible to plant roots. Gravitational: surplus in soil body after soil is saturated.
