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Unformatted text preview: CWR 6537 Subsurface Contaminant Hydrology Lecture 2 1 | P a g e PROPERTIES OF POROUS MEDIA AND FLUIDS A. Porous Media Properties (1) Density For unconsolidated media, consider the density of individual particles (particle density): (silica sand ~ 2.65 g/cm 3 ) [Note that Si = silicon, SiO 2 = silica, and silicone is a polymer of silica and organic molecules] For the bulk material (i.e., in a quantity at least equal to the REV), we consider the bulk density: (sand ~ 1.7 g/cm 3 ) (2) Porosity Porosity is defined as the ratio of the volume of void spaces to the total volume: (usually in the range ~ 0.1 - 0.5) The void volume is equal to the total volume minus the volume of the particles: Porosity, particle density, and bulk density are then related as follows: ( . 0.36 for sand) Similar media properties are volumetric water content p p p M V = B p T M V = = V V V T V V V v T p =- =- = - = - V V V V V T p T p T B p 1 1 CWR 6537 Subsurface Contaminant Hydrology Lecture 2 2 | P a g e and fluid saturation (range 0 - 1.0) We are also interested in NAPL saturation...
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- Spring '08