Publications
152 results found
Jackson BM, Wheater HS, McIntyre N, et al., 2004, Calibration and uncertainty issues arising from a process-based integrated nitrogen model (INCA) placed within a subjective probability framework, London, Hydrology: science and practice for the 21st century, July 2004, Publisher: Imperial College London, Pages: 123-129
Zacharof AI, Butler AP, 2004, Stochastic modelling of landfill processes incorporating waste heterogeneity and data uncertainty, WASTE MANAGEMENT, Vol: 24, Pages: 241-250, ISSN: 0956-053X
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- Citations: 30
Mathias SA, Butler AP, McIntyre N, et al., 2004, Applicability of box models to dual porosity systems, Hydrology: science and practice for the 21st century, Pages: 315-321
Bakr MI, Butler AP, 2003, A comparison between Monte Carlo and first-order approximation methods in capture zone design, Conference on Calibration and Reliability in Groundwater Modelling (ModelCARE 2002), Publisher: INT ASSOC HYDROLOGICAL SCIENCES, Pages: 441-447, ISSN: 0144-7815
Butler AP, Brook C, Godley A, et al., 2003, Attenuation of landfill leachate in unsaturated sandstone, Italy, Proceedings of the 9th international waste management and landfill symposium, 2003, Publisher: CISA
Zacharof AI, Butler AP, 2003, Modelling landfill process incorporating data uncertainty - model assessment against experimental data using statistical techniques, Italy, Proceedings of the 9th International waste management and landfill symposium, 2003, Publisher: CISA
Ashworth DJ, Shaw G, Butler AP, et al., 2003, Soil transport and plant uptake of radio-iodine from near-surface groundwater, JOURNAL OF ENVIRONMENTAL RADIOACTIVITY, Vol: 70, Pages: 99-114, ISSN: 0265-931X
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- Citations: 43
Butler A, Jackson B, 2003, Identification and representability of processes controlling unsaturated flow at differing temporal scales using a coupled soil- plant-water model, Conference on calibration and reliability in groundwater modelling (ModelCARE 2002), Prague, Czech Republic, Pages: 269-276
Bakr MI, Butler AP, 2002, Worth of head data in well capture zone design, Acta Universitatis Carolinae, Geologica, Vol: 46, Pages: 525-528, ISSN: 0001-7132
Stochastic capture zone design is rapidly becoming an important research activity in hydrogeology. One drawback of the published research so far is the inability to condition the capture zone on state variable measurements (e.g. head and pore water velocity). In this work we examine the effect of stochastic calibration of a groundwater flow model on the design of a well capture zone. We explicitly consider uncertainty in flow due to spatial variability of transmissivity. Calibration of a flow model considering spatial variability of model parameters is a huge challenge for groundwater scientists. Here, we use an innovative inverse algorithm that considers spatially variable parameters explicitly. In this study we shall test the effect of conditioning spatially distributed transmissivity on head measurements. A number of uniform grids representing head measurements with different density will be examined in terms of closeness of the delineated capture zone to a reference one.
Butler A, Jackson B, 2002, Identification and representability of processes controlling unsaturated flow at differing temporal scales using a coupled soil-plant-water model, Acta Universitatis Carolinae, Geologica, Vol: 46, Pages: 553-557, ISSN: 0001-7132
A model describing unsaturated flow in vegetated soil has been developed, coupling plant feedback mechanisms with a finite-difference implementation of Richards' equation. This paper describes the first application of sensitivity and uncertainty analysis to the model, using a detailed data set. Good quality of model definition and parameter identifiability at both diurnal and seasonal scales are treated as important, as is the effect of measurement error on the parametrisation at either scale. A Bayesian framework is used to facilitate error treatment and to allow the inclusion of subjective probability without losing mathematical rigour.
Bakr MI, Butler AP, 2002, A comparison between Monte Carlo and first-order approximation methods in capture zone design, Acta Universitatis Carolinae, Geologica, Vol: 46, Pages: 511-515, ISSN: 0001-7132
Monte Carlo analysis is a versatile method that can easily be implemented and used for representing parameter uncertainty in stochastic processes. It has been extensively and successfully used in stochastic well capture zone design. Although still computationally viable, in terms of CPU times, for unconditional simulations, it requires huge amounts of CPU time for conditional simulations. Conditioning hydraulic parameters on state variables, e.g. head, pore water velocity, concentration, requires solution of the inverse problem. This can be computationally intensive by itself. Here, we investigate first-order approximation as an alternative uncertainty propagation method to Monte Carlo. A comparison between the two methods, in terms of produced statistics of state variables from poré water velocity and particle tracking models, is performed.
Butler AP, Shields A, Wheater HS, et al., 2002, Performance assessment of the phased remediation of a former gas manufacturing plant, 3rd international conference on groundwater quality, Sheffield, England, Pages: 353-359
Butler AP, Shields A, Wheater HS, et al., 2002, Performance assessment of the phased remediation of a former gas manufacturing plant, 3rd international conference on groundwater quality, Sheffield, England, Pages: 353-359
Gao H, Vesovic V, Butler A, et al., 2001, Chemically reactive multicomponent transport simulation in soil and groundwater: 2. Model demonstration, ENVIRONMENTAL GEOLOGY, Vol: 41, Pages: 280-284, ISSN: 0943-0105
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- Citations: 4
Gao H, Butler A, Wheater H, et al., 2001, Chemically reactive multicomponent transport simulation in soil and groundwater: 1. Model development and evaluation, ENVIRONMENTAL GEOLOGY, Vol: 41, Pages: 274-279, ISSN: 0943-0105
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- Citations: 5
Butler AP, 2001, A review of biogeochemical modelling in subsurface environmental systems, Imperial College Report for Nirex
Zacharof AI, Butler AP, 2001, Application of a stochastic flow and transport model for leachate production to tracer test data, International waste management and landfill symposium; Sardinia 2001. Vol 3: barriers, waste mechanics and groundwater pollution, Publisher: CISA, Pages: 605-614
Zacharof AI, Butler AP, 2001, Application of a stochastic leachate and biogas model to the brogborough test cell experiment data incorporating data uncertainty, International waste management and landfill symposium; Sardinia 2001. Vol 1: the sustainable landfill, Publisher: CISA, Pages: 119-128
Zacharof AI, Butler AP, 2001, Stochastic modelling of landfill leachate and biogas production incorporating waste heterogeneity and data uncertainty, 7th International Conference on Environmental Science and Technology, Publisher: UNIV AEGEAN, Pages: 967-973
Shields ARG, Jones A, Mason J, et al., 2001, Performance assessment of the phased remediation of a former gas manufacturing plant, Columbus, 6th international in situ and on-site bioremediation symposium, San Diego, California, Publisher: Battelle Press, Pages: 123-129
Wheater HS, Tompkins JA, van Leeuwen M, et al., 2000, Uncertainty in groundwater flow and transport modelling - a stochastic analysis of well-protection zones, HYDROLOGICAL PROCESSES, Vol: 14, Pages: 2019-2029, ISSN: 0885-6087
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- Citations: 16
van Leeuwen M, Butler AP, Stroet CBMT, et al., 2000, Stochastic determination of well capture zones conditioned on regular grids of transmissivity measurements, WATER RESOURCES RESEARCH, Vol: 36, Pages: 949-957, ISSN: 0043-1397
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- Citations: 50
Butler AP, van Leeuwen M, Tompkins JA, et al., 2000, Effects of transmissivity conditioning on stochastic well capture zones, Rotterdam, international conference on groundwater research JUN 06-08, 2000 COPENHAGEN, DENMARK, Publisher: A A Balkema, Pages: 453-454
Butler AP, Wheater HS, 1999, Modeling radionuclide transport and uptake in an integrated lysimeter experiment: II. Application to sodium-22, JOURNAL OF ENVIRONMENTAL QUALITY, Vol: 28, Pages: 1946-1956, ISSN: 0047-2425
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- Citations: 2
Butler AP, Wheater HS, 1999, Modeling radionuclide transport and uptake in an integrated lysimeter experiment: I. Model development, JOURNAL OF ENVIRONMENTAL QUALITY, Vol: 28, Pages: 1938-1946, ISSN: 0047-2425
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- Citations: 3
Purcell BE, Butler AP, Sollars CJ, et al., 1999, Leachate ammonia flushing from landfill simulators, JOURNAL OF THE CHARTERED INSTITUTION OF WATER AND ENVIRONMENTAL MANAGEMENT, Vol: 13, Pages: 107-111, ISSN: 0951-7359
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- Citations: 3
Golubenkov A, Butler AP, Cheng J, et al., 1999, Effects of complexity on uncertainty estimates, Journal of Environmental Radioactivity, Vol: 42, Pages: 255-270
Butler AP, Chen J, Aguero A, et al., 1999, Performance assessment studies of models for water flow and radionuclide transport in vegetated soils using lysimeter data, JOURNAL OF ENVIRONMENTAL RADIOACTIVITY, Vol: 42, Pages: 271-288, ISSN: 0265-931X
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- Citations: 14
van Leeuwen M, Butler AP, Tompkins JA, et al., 1999, Stochastic well capture zones in fully-, leaky and randomly confined heterogeneous aquifers, Proc. MODELCARE 99 Calibration and reliability in Groundwater modelling
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