Darcy law2012

Darcy law2012 - Henry Darcy Darcy Experiment Vertical...

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1 Henry Darcy A French Engineer whose scientific discoveries of 1856 have provided the physical basis upon which groundwater hydrogeology has been studied ever since. Darcy Experiment Vertical column of sand QK A hh L  12 Darcy Experiment Q KA L Column of sand Can be oriented in any direction Darcy Experiment Most common Orientation to Represent an Aquifer with A dL ab Groundwater wells In place of the Piezometer tubes. Darcy’s Law A dL Q: discharge out of the apparatus [L 3 /T] K: Constant of proportionality termed the hydraulic conductivity [L/T] A: cross-sectional area of the tube [L 2 ] h 1 –h 2 = d h: change in hydraulic head [L] L 1 -L 2 = d L: length of the column [L] dh/dL: hydraulic gradient [ ] Negative sign indicates flow from the higher to the lower head Hydraulic Conductivity “K” (Capital K) The ability of a porous medium to transmit a fluid. It is a function of both the porous medium It is a function of the porous medium and the fluid. Units of L/T e.g. cm/sec, ft/day Used by Hydrogeologists
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2 Instrinsic Permeability “k” (lower case k) The ability of a porous medium to transmit a fluid. Is a function of the porous medium only. (size and Is a function of the porous medium only. (size and shape of the pore spaces).
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This note was uploaded on 02/18/2012 for the course GLY 4822 taught by Professor Staff during the Spring '08 term at FIU.

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Darcy law2012 - Henry Darcy Darcy Experiment Vertical...

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