Ground Water, Guest Speaker Part 2, 2-4-11

Ground Water, Guest Speaker Part 2, 2-4-11 - S ubsurface...

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Subsurface Heterogeneity Porosity ( n )=fraction of soil volume available to hold water o sands/gravels .25-.50 o sandstone .05.-.30 o shales 0-.10 o clays .01-.02 Permeability - resistance to flow Tortuosity - the nonlinear path that a substance will follow through another substance (ie, water through soil o To measure heterogeneity in the field, to see how long water would take from point A to point B, you add a conservative tracer (usually Cl-) into the water, then let it flow from A to B and measure the Cl- at the end Hydraulic Conductivity (K) velocity of H2O through soil (cm/sec) In graph of n vs K, it would give a linear line Natural groundwater usually flows .03-.3 meters / day Leaching - the vertical movement through soil 1. Porosity / permeability 2. Rate of Water Application (precip) 3. Properties of the Chemical (Kow) 4. Properties of the Soil Distribution Coefficient (Kd) Kd=[Soil] / [Water] Graph of Kow vs Kd, linear relationship Higher Organic concentration=higher line
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Ground Water, Guest Speaker Part 2, 2-4-11 - S ubsurface...

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