e-mail: tomc"at symbol"cgiss.boisestate.edu
Boise State University
1910 University Dr.
Boise ID 83725-1536
Phone: (208) 426-1416
Fax: (208) 426-3888
B.S. 1976 Mechanical Engineering Univ. of Calif., Davis
M.S. 1978 Nuclear Engineering Univ. of Calif., Berkeley
Ph. D. 1994 Geological Sciences ( Hydrogeology ) Univ. of British Columbia
Thesis: Dual Permeability Modeling of Fractured Media
The overarching goal of my research interests is to help develop methods to improve environmental decision making. Within this scope I focus on the limitations of flow and transport simulations to adequately represent reality. My research tends to be problem driven rather than vision driven, but the products tend to be new methods of addressing the problems. My recent work can be placed five overlapping categories;
* Model Prediction Uncertainty Characterization,
* Subsurface Characterization,
* Distributed Parameter Estimation,
* Wellbore and Flowmeter Fluid Hydraulics,
* Computer Code Development.
Each category in the list is motivated by the earlier categories.
To a large degree my research takes advantage of the expertise in inversion technology provided by working with other members of CGISS. Parameter estimation is a key component of my work - enabled by working in CGISS. Distributed parameter estimation is similar to many geophysical inversion problems allowing me to borrow techniques from my colleagues. I am hoping to help make distributed parameter inversion a practical tool in hydrogeology. A collaboration with John Doherty of Watermark Numerical Computing and Matt Tonkin of SSPA gives me confidence that it can be achieved.
Working on the Boise Hydrogeophysical Research Site provides the motivating problems for my work. Investigations of data acquired from an electromagnetic flowmeter has led to modeling the response of the flowmeter in an integrated borehole-aquifer model. Development of a hydraulic tomography approach to estimate BHRS led to my immersion in geophysical inversion techniques. Hydraulic tomography has led to a version of MODFLOW that calculates parameter sensitivities using the adjoint state method. It has also lead to an improvement of MODFLOW's response to rapid water table decline near a pumping well.
My current work focuses on two closely related problems; hydraulic tomography and transport prediction uncertainty. These two problems are related by the need to apply efficient numerical techniques to infer subsurface properties from hydrologic measurements and the understand the uncertainties of these estimates and how those uncertainties propagate though a numerical simulation of transport to a prediction.
RECENT PUBLICATIONS: (as of 10/19/07)
Johnson, T. C., P. S. Routh, T. Clemo, W. Barrash, and W. P. Clement, Incorporating geostatistical constraints in nonlinear inversion problems,Water Resources Research, 43, W10422, doi:10.1029/2006WR005185, 2007.
Barrash, Warren, Tom Clemo, Jessica J. Fox, and Timothy C. Johnson, Field, laboratory, and modeling investigation of the skin effect at wells with slotted casing, Boise Hydrogeophysical Research Site, Journal of Hydrology, 326, 181-198, 2006.
Muffels, Chris, Matthew Tonkin, Haijiang Zhang, Mary Anderson, and Tom Clemo, Application of LSQR to calibration of a MODFLOW model: A synthetic study, MODFLOW and more 2006: Managing Ground-Water Systems - Conf. Proc., Poeter, Hill & Zheng (eds), International Ground Water Modeling Center, Golden CO, 283-287, 2006.
Clemo, Tom and Warren Barrash, In-well fluid hydraulics simulation for modeling of borehole flowmeter response in a layered aquifer, MODFLOW and more 2006: Managing Ground-Water Systems - Conf. Proc., Poeter, Hill & Zheng (eds), International Ground Water Modeling Center, Golden CO, 721, 2006.
Clemo, Tom, Flow in perforated pipes: A comparison of models and experiments, SPE Production and Operations, 21 (2), DOI:10.2118/89036-PA, 302-311, 2006.
Clemo, Tom, Improved water table dynamics in MODFLOW, Ground Water, 43(2), 270-273, 2005.
Clemo, Tom, Improved water table dynamics in block-centered finite-difference flow models, Proc. of MODFLOW and more 2003 understanding through modeling, International Ground Water Modeling Center, Golden CO, 47-50, 2003
Clemo, Tom, and Warren Barrash, Inversion of borehole flowmeter measurements considering well screen clogging and skin, Proc. of MODFLOW and more 2003 understanding through modeling, International Ground Water Modeling Center, Golden CO, 99-103, 2003
Clemo, Tom, Paul Michaels, and R. Michael Lehman, Transmissivity resolution obtained from the inversion of transient and pseudo-steady drawdown measurements, Proc. of MODFLOW and more 2003 understanding through modeling, International Ground Water Modeling Center, Golden CO, 629-633, 2003
Tonkin, Matthew, Tom Clemo, and John Doherty, Computationally efficient regularized inversion for highly parameterized MODFLOW models, Proc. of MODFLOW and more 2003 understanding through modeling, International Ground Water Modeling Center, Golden CO, 595-599, 2003
Barrash, Warren, Michael D. Knoll, David W. Hyndman, Tom Clemo, Edward C. Reboulet, Elisabeth M. Hausrath, Tracer/time-lapse radar imaging test at the Boise Hydrogeophysical Research Site, Proc. SAGEEP 2003 (San Antonio, TX), EEGS, Denver, CO, 163-174, 2003
Barrash, Warren and Tom Clemo, Hierarchical Geostatistics, Multi-facies Systems, and Stationarity: Boise Hydrogeophysical Research Site, Boise, Idaho , Water Resources Research, 38 (10), DOI:10.1029/2002WR001436, 2002. Correction of Equation 4
Welhan, J. A., T. Clemo, and E. Gego, Stochastic simulation of aquifer heterogeneity in a layered basalt system, eastern Snake River Plain, Idaho, In Link P.K., R. Mink, D. Ralston (eds.), Geology, Hydrogeology, and Environmental Remediation, Idaho National Engineering Laboratory, eastern Snake River Plain, Idaho, Geol. Society of America, Special Paper 353, 225-247, 2002.
Welhan, J. A., C. Johannesen, K. Reeves, T. Clemo, J. Glover, and K. Bosworth, Morphology of inflated pahoehoe lavas and spatial architecture of their porous and permeable zones, eastern Snake River Plain, Idaho, In Link P.K., R. Mink, D. Ralston (eds.), Geology, Hydrogeology, and Environmental Remediation, Idaho National Engineering Laboratory, eastern Snake River Plain, Idaho, Geol. Society of America Special Paper 353, 135-150, 2002.
Clemo, Tom and John Welhan, Simulating Basalt Lava Flows using a Structure Imitation Approach, In Bentley, L. R., et al. (eds.), Proc. of XIII International Conference on Computational Methods in Water Resources, Calgary, June, 2000: Rotterdam; Balkema, 841-848, 2000.
Barrash, W., and Clemo, Tom, Hierarchical geostatistics of porosity derived from neutron logs at the Boise Hydrogeophysical Research Site, Boise, Idaho, USA, Proceedings of the International Conference on Tracers and Modeling in Hydrogeology, TraM2000, (Liege, Belgium), International Association of Hydrological Sciences, 333-338, 2000.
Barrash, Warren, Tom Clemo, and Michael D. Knoll, Boise Hydrogeophysical Research Site (BHRS): Objectives, Design, Initial Geostatistical Results, Proc. Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP'99), Environmental and Engineering Geophysical Society, Oakland, CA, 389-398, March, 1999.