GEG 3102 Lecture Notes - Lecture 5: Laminar Flow, Oceanic Crust, Effective Porosity
17 Oct 2016
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Document Summary
Water beneath the land surface that is in the saturated zone. The rest is captured during sedimentation (connate water) Water can also be trapped when oceanic crust subducts. Infiltration rate depends on the host material condition. Porosity (volume of voids in the material) Primary: the porosity that the material hade when it was formed. Secondary: porosity that develops later (ex. cracks) Volume fraction of the soil that participated in water flow process. Can be less than or equal to the porosity. Some materials have a high porosity that the water can"t reach. Or pores may be connected, but out of the flow path (ex. truck stop) Percolation: vertical flow of water, driven by gravity (def. ) Occurs when the soil exceeds the field capacity. The max volume of water a soil can hold against gravity once the excess water has drained. Lower than the amount of water present at saturation because the largest pores may be filled with air.
