lec 8 aquifer test

lec 8 aquifer test - Aquifer Tests Lecture 8 (Max) Qinhong...

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Aquifer Tests Lecture 8 (Max) Qinhong Hu ydrogeology Hydrogeology (GEOL 4320 and 5328) Fall 2009
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Outline Water flow in confined aquifers ater flow in unconfined aquifers Water flow in unconfined aquifers Steady radial flow to a well Unsteady radial flow in a confined aquifer Unsteady radial flow in a leaky aquifer nsteady radial flow in an unconfined aquifer Unsteady radial flow in an unconfined aquifer Well capacity, well efficiency, and well skin 2
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Mathematical Analyses of Groundwater Flow low equations can be solved by Flow equations can be solved by Analytical approaches m ri l ppr h Numerical approaches Analytical approaches Based on classical methods for solving differential equations Have been used in groundwater applications since the 1930s For simple problems (regular geometry, homogeneous aquifer properties, simple initial 3 and boundary conditions) Use Excel, a calculator, tables of functions
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Mathematical Analyses of Groundwater Flow Numerical approaches Developed in concert with modern computers Tremendously powerful n b ppli d t l t th m t Can be applied to evaluate the most complicated, real-world problems Can handle variability in hydraulic properties, large numbers of wells, and complicated boundary conditions (e.g., variable recharge/evaporation and 4 groundwater/surface water interactions)
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Steady Flow in a Confined Aquifer 5
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Steady Flow in a Confined Aquifer 0 2 h 0 0 h h x Laplace equation Steady-state 2 x h h One-dimensional omogeneous aquifer L L x Homogeneous aquifer x h h h h L x ) ( 0 0 h h K q L x 0 6 L L
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Steady Flow in a Confined Aquifer 7
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Steady Unidirectional Flow in a Confined Aquifer 2 0 2 x h qx h K h h d The head decreases l q linearly with flow th 8 in the x- direction
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Piezometers Potentiometric surface 9
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Confined Aquifer: Example If the distance and observed piezometer surface drop between two adjacent wells are 1,000 m and 3 m , respectively, find an estimate of the time it takes for a molecule of water to move from one well to e other Assume steady unidirectional flow in a homogeneous silty the other. Assume steady unidirectional flow in a homogeneous silty sand confined aquifer with a hydraulic conductivity K=3.5 m/day and an effective porosity of 0.35 . d m d m m hK q / 0105 . 0 000 ) / 5 . 3 )( 3 ( m x ) 1000 ( d m q 3 ) / 0105 . 0 ( d m n e / 03 . 0 ) 35 . 0 ( 000 10 yrs d d m m L t 3 . 91 33333 / 03 . 0 1000
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Outline Water flow in confined aquifers ater flow in unconfined aquifers Water flow in unconfined aquifers Steady radial flow to a well Unsteady radial flow in a confined aquifer Unsteady radial flow in a leaky aquifer nsteady radial flow in an unconfined aquifer Unsteady radial flow in an unconfined aquifer Well capacity, well efficiency, and well skin 11
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Steady Flow in an Unconfined Aquifer The gradient of the water table in unconfined aquifer is not constant ; it increases in the direction of flow as the cross-sectional area gets smaller No analytical solution 12 to the Laplace equation
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This note was uploaded on 12/29/2010 for the course GEOL 4320 taught by Professor Maxhu during the Fall '09 term at UT Arlington.

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lec 8 aquifer test - Aquifer Tests Lecture 8 (Max) Qinhong...

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