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Airborne Electromagnetics in the Marina Area Marina Coast Water - PowerPoint PPT Presentation

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Airborne Electromagnetics in the Marina Area Marina Coast Water District Ian Gottschalk and Rosemary Knight, Stanford University Aqua Geo Frameworks, Mitchell, NE 1 SkyTEM 2 Saltwater Intrusion cross section map view N Water Table

  1. Airborne Electromagnetics in the Marina Area Marina Coast Water District Ian Gottschalk and Rosemary Knight, Stanford University Aqua Geo Frameworks, Mitchell, NE 1

  2. SkyTEM 2

  3. Saltwater Intrusion cross section map view N Water Table Freshwater Sealevel Saltwater r o o l f a e a’ S a Saltwater Freshwater a a’ Tom Szenher 3

  4. How do we learn about what lies underneath? ? 4

  5. How do we learn about what lies underneath? ? 5

  6. How do we learn about what lies underneath? ? 6

  7. How do we learn about what lies underneath? Complex scenarios can be difficult to decipher, even with many wells drilled ? 7

  8. Geophysics as a method to learn about the subsurface Goebel et al., 2017 8

  9. Geophysics as a method to learn about the subsurface Goebel et al., 2017 9

  10. Airborne Electromagnetics ? 10

  11. Airborne Electromagnetics 30 m (100 ft) above the ground 80 km/hr (50 mph) ? 200-300m (650-1000ft) 250-350 km (150-220 miles) flown in a day 11

  12. 12

  13. Current flows around transmitter loop 13

  14. Current flows around transmitter loop Primary magnetic field generated 14

  15. Current flows around transmitter loop Primary magnetic field depth depends on electrical conductivity generated Eddy currents induced in the ground 15

  16. Current flows around transmitter loop Secondary magnetic field Primary magnetic field detected by receiver coils generated Eddy currents induced in the ground 16

  17. Resistivity profiles Elevation (m) 17

  18. Resistivity profiles Fresh Saline Elevation (m) Saline Fresh 18

  19. Resistivity measurements in wells A B Marina Salinas River Ocean Saline Fresh 19

  20. Resistivity measurements in wells A B Marina Salinas River Ocean Data recorded in 2015 Saline Fresh 20

  21. Resistivity measurements in wells A Saline B Marina Salinas River Ocean Fresh Saline Fresh 21

  22. AEM data expands our knowledge A B Marina Salinas River Ocean Saline Fresh 22

  23. AEM data expands our knowledge A B Marina Salinas River Ocean =Saline =Fresh 23

  24. AEM data expands our knowledge A B Marina Salinas River Ocean =Saline =Fresh 24

  25. A AEM data expands our knowledge B Salinas River Marina Saline Fresh 25

  26. A AEM data expands our knowledge B Salinas River Marina Saline Fresh 26

  27. A AEM data expands our knowledge B Salinas River Marina Saline Fresh 27

  28. A AEM data expands our knowledge B Salinas River Marina Saline Fresh =Saline =Fresh 28

  29. A AEM data expands our knowledge B Salinas River Marina Saline Fresh =Saline =Fresh 29

  30. The data in action (video clip) 30

  31. Moving forward geophysical properties that we measure 31

  32. Moving forward geophysical properties that we measure hydrogeologic information that we want -water quality -hydraulic conductivity 32

  33. Thank You 33

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