groundwater david r. maidment ce 394k.2 spring 2005 reading: handbook of hydrology, chapter 6, sec...
TRANSCRIPT
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Groundwater
David R. Maidment
CE 394K.2
Spring 2005
Reading: Handbook of Hydrology, Chapter 6, Sec 6.1 to 6.7
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Groundwater Investigation
• Can’t “see” groundwater so a lot more is done by inference and interpretation than for surface water
• Site investigation– Conceptual model of geological environment
and the flow system through it– Field measurements (bore holes, pump tests,
geophysics)– Hydrogeologic simulation model (e.g.
Modflow)
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Groundwater Investigation
Figure 6.1.1
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Geological Time Scale
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Comal and San Marcos Springs are the major outflow points for the “Southern Segment” of the Edwards Aquifer
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Barton Springs Segment of Edwards Aquifer
http://www.bseacd.org/geology.html
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Geological Evolution
http://www.edwardsaquifer.net/geology.html
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Hydrogeology of Aquifer
http://www.bseacd.org/hydrogeology.html
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Karst terrain – caves, sinkholes and underground streams
http://www.bseacd.org/karst.html
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Flow in Barton Springs
2001
2000
2002 2003 2004
http://www.bseacd.org/cc_water_levels.html
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Piezometric Head Map
Tucson, Az.
Figure 6.3.2
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Monitoring Points
Buda
Dowell
Negley
Lovelady
Barton Springs(surface water)
Well
Stream gage
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Piezometric Head Level
Depth from the ground surface
Elevation head
Pressure head
Piezometric head
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http://www.bseacd.org/cc_water_levels.html
2002 2003 2004
Buda
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Piezometric head in monitoring wells
Dowell Monitoring Well
2002 2002 2003 2004
20032004
BudaDowell
Buda Monitoring Well
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Equipotential Lines and Flow
q = K dh/dx
Figure 6.3.5
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Flow Net
Figure 6.4.1