GSA Connects 2021 in Portland, Oregon

Paper No. 58-2
Presentation Time: 2:30 PM-6:30 PM


HALIHAN, Todd1, ACHARYA, Bharat Sharma2, HAGER, John P.1, GUERTAULT, Lucie3 and FOX, Garey3, (1)Boone Pickens School of Geology, Oklahoma State University, 105 Noble Research Center, Stillwater, OK 74078, (2)Department of Mines, State of Oklahoma, 2915 N. Classen Blvd, Suite 213, Oklahoma City, OK 73106, (3)Department of Biological and Agricultural Engineering, North Carolina State University, 127 Weaver Labs, Raleigh, NC 27695-7625

Riparian soils are uniquely susceptible to the formation of macropores, voids with preferential flow in comparison to surrounding strata, which are hypothesized to promote fast transport of water through soil layers. Temporal Electrical Resistivity Imaging (TERI) can locate spatial heterogeneities in soil wetting patterns caused by preferential flow through macropores, thus optimizing the design of riparian buffers. In a field evaluation of naturally occurring macropores, the TERI technique would detect the wetted zone around a macropore similar to an area of increased hydraulic conductivity in a heterogeneous soil matrix. An experiment was established in coarse soil to evaluate if TERI datasets could quantify matrix and macropore hydraulic properties. Results show TERI as a viable method for calculating the fluid velocity along a series of vertical profiles in the coarse-grained North Carolina field site. The datasets allowed the distribution and hydraulic properties of the macropores to be quantified when compared with traditional soil datasets.