Preliminary Assessment of the Importance of Mountain Block Faults to Groundwater Flow in the Carbonate-Rock Aquifers of th...
Background <ul><li>Geologic History </li></ul><ul><ul><li>Carbonates deposited during Paleozoic </li></ul></ul><ul><ul><li...
Background <ul><li>Previous Work </li></ul><ul><ul><li>Cole, et al. (1992) completed steady-state simulation of Tikaboo Va...
NEVADA UTAH CALIFORNIA ARIZONA IDAHO OREGO N Limit of Great Basin LAS VEGAS CARBONATE ROCK PROVINCE GARDEN PENOVER COAL TI...
Four Basin Model <ul><li>Four basins modeled included Penoyer, Garden, Coal, and Tikaboo Valleys </li></ul><ul><li>One squ...
Discretization
Results
Worthington Model <ul><li>1/8 square mile discretization </li></ul><ul><li>Penoyer Valley fault on western flank, Garden V...
Discretization PENOVER VALLEY FAULT GARDEN VALLEY FAULT
No Fault Zones
Low Conductivity 5075 ft 5000 ft 4975 ft 4950 ft 4925 ft 4900 ft 5050 ft 5000 ft 4975 ft 5075 ft 5025 ft 4950 ft 4925 ft 4...
High Conductivity 5025 ft 5000 ft 4975 ft 4950 ft 4925 ft 4900 ft 5025 ft 5000 ft 4975 ft 5050 ft
Timpahute Model <ul><li>1/6 square mile discretization </li></ul><ul><li>Penoyer Valley, Penoyer Springs, Tikaboo Valley, ...
Discretization PENOVER VALLEY FAULT RANGE BOUNDING FAULT PENOVER SPRINGS FAULT TIKABOO VALLEY FAULT SCHOFIELD PASS FAULT
No Fault Zones
Low Conductivity
High Conductivity
Conclusions <ul><li>Sub-region flow models reflect regional models at a gross level </li></ul><ul><li>Low conductivity fau...
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Preliminary Assessment of the Importance of Mountain Block Faults to Groundwater Flow in the Carbonate-Rock Aquifers of the Southern Great Basin

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Presentation of thesis results before the National Ground Water Association in Nashville, Tennessee, October 1999

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Preliminary Assessment of the Importance of Mountain Block Faults to Groundwater Flow in the Carbonate-Rock Aquifers of the Southern Great Basin

  1. 1. Preliminary Assessment of the Importance of Mountain Block Faults to Groundwater Flow in the Carbonate-Rock Aquifers of the Southern Great Basin Douglas B. Blatchford, PE Harding Lawson Associates Steve A. Mizell, PhD Desert Research Institute
  2. 2. Background <ul><li>Geologic History </li></ul><ul><ul><li>Carbonates deposited during Paleozoic </li></ul></ul><ul><ul><li>Compression placed older formations over younger during Mesozoic </li></ul></ul><ul><ul><li>Extensional deformation and volcanism occurred during Cenozoic </li></ul></ul><ul><ul><li>Present day physiography characterized by structural basins </li></ul></ul>
  3. 3. Background <ul><li>Previous Work </li></ul><ul><ul><li>Cole, et al. (1992) completed steady-state simulation of Tikaboo Valley </li></ul></ul><ul><ul><li>Brothers, Buqo, and Tracy (1993) completed steady-state simulation of Coal and Garden Valleys </li></ul></ul><ul><ul><li>Dettinger et al. (1995) described the distribution of carbonate rock aquifers </li></ul></ul><ul><ul><li>Prudic, Harrill, and Burbey (1995) provided a conceptual evaluation of regional ground water flow </li></ul></ul>
  4. 4. NEVADA UTAH CALIFORNIA ARIZONA IDAHO OREGO N Limit of Great Basin LAS VEGAS CARBONATE ROCK PROVINCE GARDEN PENOVER COAL TIKABOO
  5. 5. Four Basin Model <ul><li>Four basins modeled included Penoyer, Garden, Coal, and Tikaboo Valleys </li></ul><ul><li>One square mile discretization </li></ul><ul><li>Four basin grid 115 rows x 60 columns </li></ul><ul><li>Results calibrated against regional model by Prudic, Harrill, and Burbey (1995) </li></ul>
  6. 6. Discretization
  7. 7. Results
  8. 8. Worthington Model <ul><li>1/8 square mile discretization </li></ul><ul><li>Penoyer Valley fault on western flank, Garden Valley fault on eastern flank </li></ul><ul><li>Results generated for: </li></ul><ul><ul><li>No fault zones </li></ul></ul><ul><ul><li>Low conductivity faults </li></ul></ul><ul><ul><li>High conductivity faults </li></ul></ul>
  9. 9. Discretization PENOVER VALLEY FAULT GARDEN VALLEY FAULT
  10. 10. No Fault Zones
  11. 11. Low Conductivity 5075 ft 5000 ft 4975 ft 4950 ft 4925 ft 4900 ft 5050 ft 5000 ft 4975 ft 5075 ft 5025 ft 4950 ft 4925 ft 4900 ft 4875 ft 5025 ft 5050 ft 5075 ft 5000 ft 4975 ft 4950 ft 4925 ft 4900 ft 5025 ft 5050 ft
  12. 12. High Conductivity 5025 ft 5000 ft 4975 ft 4950 ft 4925 ft 4900 ft 5025 ft 5000 ft 4975 ft 5050 ft
  13. 13. Timpahute Model <ul><li>1/6 square mile discretization </li></ul><ul><li>Penoyer Valley, Penoyer Springs, Tikaboo Valley, Schofield Pass, and a Range Bounding fault modeled </li></ul><ul><li>Results generated for: </li></ul><ul><ul><li>No fault zones </li></ul></ul><ul><ul><li>Low conductivity faults </li></ul></ul><ul><ul><li>High conductivity faults </li></ul></ul>
  14. 14. Discretization PENOVER VALLEY FAULT RANGE BOUNDING FAULT PENOVER SPRINGS FAULT TIKABOO VALLEY FAULT SCHOFIELD PASS FAULT
  15. 15. No Fault Zones
  16. 16. Low Conductivity
  17. 17. High Conductivity
  18. 18. Conclusions <ul><li>Sub-region flow models reflect regional models at a gross level </li></ul><ul><li>Low conductivity faults accentuate mounding below mountains </li></ul><ul><li>Low conductivity faults perpendicular to regional flow do not impact flow direction </li></ul><ul><li>High conductivity faults parallel to regional flow act as drains </li></ul>

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