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R.B. Miller, D.M. Heeren, G.A. Fox, T. Halihan, D.E. Storm and A.R. Mittelstet

OKLAHOMA STATE UNIVERSITY Biosystems and Agricultural Engineering. Electrical Resistivity Profiling and Hydraulic Properties of Preferential Flow Paths in Alluvial Floodplains. R.B. Miller, D.M. Heeren, G.A. Fox, T. Halihan, D.E. Storm and A.R. Mittelstet.

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R.B. Miller, D.M. Heeren, G.A. Fox, T. Halihan, D.E. Storm and A.R. Mittelstet

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  1. OKLAHOMA STATE UNIVERSITY Biosystems and Agricultural Engineering Electrical Resistivity Profiling and Hydraulic Properties of Preferential Flow Paths in Alluvial Floodplains R.B. Miller, D.M. Heeren, G.A. Fox, T. Halihan, D.E. Storm and A.R. Mittelstet ASCE EWRI Conference, May 18, 2010

  2. Introduction • Preferential Flow Paths (PFPs) • Subsurface transport (e.g. phosphorus) • Bypass buffer strips • Transient storage zone PFP

  3. PFP Previous Research • Tracer tests • Rapid flow • Discrete direction • Little P sorption

  4. Preferential Flow: Stream/Aquifer Interaction OKLAHOMA STATE UNIVERSITY Biosystems and Agricultural Engineering Department Ozark Ecoregion

  5. Alluvial floodplains Topsoil: high infiltration rates Subsoil: coarse chert gravel Preferential Flow: Stream/Aquifer Interaction OKLAHOMA STATE UNIVERSITY Biosystems and Agricultural Engineering Department Field Sites Honey Creek gravel bar Barren Fork streambank: topsoil /gravel Alluvial subsoil material obtained from site

  6. Geomorphically Active Preferential Flow: Stream/Aquifer Interaction OKLAHOMA STATE UNIVERSITY Biosystems and Agricultural Engineering Department

  7. Electrical Resistivity (ERI) Ohm-m

  8. ERI Instruments Preferential Flow: Stream/Aquifer Interaction OKLAHOMA STATE UNIVERSITY Biosystems and Agricultural Engineering Department • Geometrics OhmMapper • Lower precision • Large areas • AGI SuperSting • High precision • Small areas

  9. Large Scale Mapping Preferential Flow: Stream/Aquifer Interaction OKLAHOMA STATE UNIVERSITY Biosystems and Agricultural Engineering Department • Abandoned channels and buried gravel bars

  10. High Precision Mapping Honey Creek Flint Creek

  11. Honey Creek

  12. Flint Creek

  13. ERI  Hydraulic Conductivity? • Darcy’s Law: • K function of: • Porosity • Saturation • Pore size • Clay content • Ohm’s Law: • ρ function of: • Porosity • Saturation • Solute concentration • Clay content

  14. Borehole Permeameter

  15. USBR Solution Zone 1: Unsaturated Zone 2: Unsaturated, near WT

  16. Ks = f(ρ)

  17. ERI Interpolation • Horizontal slices • Variogram • 3-D Ks data

  18. Barren Fork

  19. Honey Creek

  20. Flint Creek

  21. Pumpkin Hollow

  22. Conclusions • Heterogeneity at each site • Non-random • Connected high K zones: PFPs • Linear ρ-Ks correlation (R2=0.73) • Max Ks increased with stream order • Data for numerical groundwater models

  23. Acknowledge:Oklahoma Conservation Commission (EPA 319 grant)E-mail: derek.heeren@okstate.eduResearch Website: http://biosystems.okstate.edu/Home/gareyf/AlluvialPTransport.htm

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