Topic 11_colour

Topic 11_colour - Topic10 Hydrology 1.Introduc>on...

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Geography 211 (Fall 2009) 11/2/09 1 Topic 10 Hydrology 1. Introduc>on Hydrologic Cycle
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Geography 211 (Fall 2009) 11/2/09 2 2. Climate and water Evapotranspira>on Combina>on of evapora>on and transpira>on Poten>al evapotranspira>on (PE) Is the amount of water that would evaporate and transpire under op>mal condi>ons Actual evapotranspira>on (AE) Is the actual amount of evapora>on and transpira>on that occurs Precipita>on and Poten>al Evapotranspira>on Climate and Water Budgets
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Geography 211 (Fall 2009) 11/2/09 3 3. Water in the Subsurface Unsaturated zone (vadose): Zone through which water percolates; does not fully saturate pores Saturated zone (phrea>c): Water fully saturates pore spaces in bedrock/soil/weathered material Large grains vs. small grains Poorly sorted sediments: fine-grained fragments fill in open space Porosity volume of pore space rela>ve to total volume (rock and/or sediment + pore space) Porosity: Total pore space Total volume Igneous and Metamorphic Rocks • Porosity often low because minerals tend to be intergrown (little free space) • Fractured rocks could have high porosity Sedimentary Rocks • low or high pore space Highly cemented or compacted sedimentary rocks have lower porosity.
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Geography 211 (Fall 2009) 11/2/09 4 Permeability degree to which pore spaces are interconnected, and size of
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Topic 11_colour - Topic10 Hydrology 1.Introduc>on...

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