Publications
Bruggemann, D.A., Francis, O.J., 2014. Remedial grouting at Shon Sheffrey dam, Wales, Maintaining the Safety of our Dams and Reservoirs: Proceedings of the 18th Biennial Conference of the British Dam Society at Queen’s University, Belfast, from 3–6 September 2014. ICE Publishing, pp. 125-134.
Kofoed, V.O., Gardiner, K.D., George, A.A., 2008. Locating the leakage route at Torside Reservoir using the Willowstick AquaTrack system, Ensuring Reservoir Safety into the Future, pp 1-12.
Kofoed, V.O., Jessop, M.L., Wallace, M.J., 2011. Unique applications of MMR to track preferential groundwater flow paths in dams, mines, environmental sites, and leach fields, The Leading Edge, February 2011, Vol. 30, No. 2.
Kofoed, V.O., Jessop, M.L., Wallace, M.J., 2012. Assessing seepage flow conditions through a dam quickly and accurately without drilling or drawing down the reservoir, 25th Symposium on the Application of Geophpysics to Engineering & Environmental Problems.
Kofoed, V., Jessop M., Wallace M., 2014. Investigating seepage at the Bartley dam, UK, Hydropower & Dams Issue Four, 2014.
Kofoed, V.O., Montgomery, J., Bowers R. L., 2006. Mapping geothermal resources: a minimally invasive procedure, Proceedings, Thirty-first Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, January 30-February 1, 2006. SGP-TR-179.
Kofoed, V.O., Montgomery, J., Gardiner, K., 2006. Identifying leakage paths in earthen embankments, improvements in reservoir construction, operation and maintenance: Proceedings of the 14th Conference of the British Dam Society at the University of Durham from 6 to 9 September 2006. Thomas Telford Publishing, pp. 119-128.
Kofoed, V.O., Rollins, P.B., 2007. Characterizing contaminated groundwater sites, Symposium on the Application of Geophysics to Engineering and Environmental Problems, pp. 653-656.
Montgomery, J., Kofoed, V.O., 2008. Characterizing groundwater using controlled source audio frequency domain magnetics, Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008. Society of Exploration Geophysicists, pp. 969-972.
Urlich, C, Hughes A, and Gardner. V., 2017. Tailings Seepage Paths Mapped using Electric-Based Technology, Mine Water and Circular Economy IMWA 2017, pp. 64-72.
Wallace, M.J., Montgomery, J.R., Kofoed, V.O., Jessop, M.L, 2009. Controlled source audio frequency domain magnetics for seepage diagnosis of Laural Bed Dam in southwest Virginia, USA, SEG Technical Program Expanded Abstracts 2009: pp. 1489-1493.
Wallace, M.J., Montgomery, J.R., Kofoed, V.O., Jessop, M.L, 2009. Seepage diagnosis of earthen embankments with controlled source audio frequency domain magnetics (CS-AFD-M), SEG Technical Program Expanded Abstracts 2009: pp. 1355-1359.
Patents
System for detecting a location of a subsurface channel
Patent number: 9588247
Abstract: A system for detecting a location of a subsurface channel may include a portable frame and a plurality of magnetic coils supported by the frame. The magnetic coils may be spaced apart from one another and ends of each of the magnetic coil are unobstructed by other of the magnetic coils.
Type: Grant
Filed: February 27, 2013
Date of Patent: March 7, 2017
Assignee: Willowstick Technologies, LLC
Inventors: Val O. Kofoed, Jerry R. Montgomery, Rondo N. Jeffery, N. Rich Montgomery, Michael L. Jessop, Michael J. Wallace, Benjamin A. Christensen
Subsurface hydrogeologic system modeling
Patent number: 8688423
Abstract: A method of modeling a subsurface hydrogeologic system within a study area can include applying an electric current directly to the subsurface hydrogeologic system and monitoring a magnetic field generated by the electric current in the subsurface hydrogeologic system. An electric current distribution can be identified within the study area by an inversion process based on the magnetic field. A model of the electric current distribution can be created.
Type: Grant
Filed: January 31, 2012
Date of Patent: April 1, 2014
Assignee: Willowstick Technologies, LLC
Inventors: Michael L. Jessop, Michael J. Wallace, Wei Qian, Jerry R. Montgomery, Rondo Jeffery, Val O. Kofoed
