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The inverse problem for groundwater flow simulation models: comparative analysis of some solution methods
HYDROGEOLOGY:FLUID 963075
Water pollution III: modelting, measuring and prediction Ed L. C. Wrobel & P. Latinopoulos, (Computational Mechanics Publications, Southampton), ISBN (hardback) 1 85312 310 2 (UK), 156252 234 5 (US), 1995, 526 pp. This book contains the papers presented at the third international conference held in Porto Carras, Greece in 1995. The main objective of the proceedings is to provide rapid dissemination and exchange of information on developments in water pollution and related environmental issues. The contents are divided into ten main sections each comprising between five and fifteen individual papers. The main sections are as follows: groundwater and aquifer contamination; lakes, rivers and channels; coastal pollution; sewage outfalls; watewater treatment; agricultural pollution; heavy metals; management aspects; statistical models and data acquisition/modelling. (S.E.Long) 963076 Prediction of interwell tracer flow bebaviour in beterogeneous reservoirs Tongchun Yi, T. Sezgin Daltaban & R. A. Dawe, Transport in Porous Media, 17(l), 1994, pp 59-75. A new numerical approach has been developed for predicting the interwell tracer flow behaviour in heterogeneous porous media typical of water and oil reservoirs. This approach uses a mixed finite-element method with triangular elements to predict pressure. and velocity fields, and a novel random walk model to simulate the tracer transport through the reservoir, and to predict the concentration response at the production well. (from Authors) 963077 MFE-TRANSP: one-dimensional moving-finite-element program for modeling solute transport in porous media G. Gottardi & M. Venutelli, Computers & Geosciences, 21(S), 1995, pp 663-685. The dynamically self-adaptive moving-finite-element (MFE) grid method, used in this program, obtains accurate and efficient solutions of the advection-dispersion equation for a wide range of Courant and Peclet numbers. The program accurately simulates, with no oscillations, steep fronts using space and time step sizes well beyond conventional constraints of the Peclet and Courant numbers. (from Authors) 963078 Hydraulic radius and transport in reconstructed model three-dimensional porous media D. P. Bentz & N. S. Martys, Transport in Porous Media, 17(3), 1994, pp 221-238. Many processes such as filtration and catalysis and the durability of many materials such as concrete are highly dependent on the underlying transport properties of the relevant microstructure. Here methods for reconstructing three-dimensional porous media from two-dimensional cross sections are evaluated in terms of the transport properties of the reconstructed systems. (from Authors) 963079 II problema inverse nei modelli di simulazione dei deflussi sotterranei: an&i comparativa di aicuni metodi risolutivi (The inverse problem for groundwater flow simulation models: comparative analysis of some solution methods) A. Criminisi & T. Tucciarelli, Energia Elettrica, 72(2), 1995, pp 50-55. The groundwater flow model calibration is studied by comparing four different methodologies: 1) the direct method; 2) the maximum likelihood method; 3) the Hubert robust estimation method and 4) the minimum residual method. After a short review of the theory, the results of Monte Carlo experiments carried out with a synthetic example are discussed. The results lead to a good validation of the second and fourth methods, whereas the third one exhibits convergence problems without a meaningful improvement in the parameter estimation. (English summary)
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963080
Radionuclide migration experiments under laboratory conditions T. T. Vandergraaf, Geophysical Research Letters, 22(11), 1995, pp 1409-1412. Results are presented from a series of migration experiments performed in a natural fracture in a quarried block of granite with overall dimensions of 81 x 90 x 75 cm. Results show that the behaviour of radioisotopes is usually more complex than can be represented by a-simple, reversible sorption coefficient (K-1. \ .., However. the transuort models that use this simple K, tend to give conservative &mates of contaminant transport in environmental and safety assessment calculations. (from Author) 963081 Analysis of radionuclide transport through fissured porous media with a perturbation method M. Banat, Nuclear Geophysics, 9(2), 1995, pp 107-120. This paper presents a specific procedure for obtaining solutions for the transport of radionuclides in a fissured porous media. The concentration profiles are deduced for a wide range of Peclet numbers using a perturbation method with a multiscale of time. Results show clearly that because of an increase of longitudinal dispersion, the radionuclide moves faster with respect to the case of zero dispersion (i.e. an infinite Peclet number). (from Author) 963082
Migration of radionuclides from a deep geological repositorv: analvtical model with radial diffusion in host matrix R. -N. Nai; & T. M. Krishnamoorthy, Nuclear Geophysics, 9(3), 1995, pp 219-228. A mathematical model has been developed to study the migration of radionuclides through a single fracture from a high-level radioactive waste repository located in deep geological granite formations. The model utilizes two coupled equations; one for the fracture and the other for the host rock. Results indicate steep gradients in the radionuclide concentrations within the first 50 m along the fracture axis. It is observed that about 99% of the radioactivity is retained by the host rock. The radionuclide concentration in the fracture water increases as the fracture radius increases until a critical fracture radius is reached. Thereafter the concentration decreases due to the increase in the volumetric flux of water. The magnitude of the critical fracture radius mainly depends on the fracture water velocity. (from Authors) 963083 Stormwater management so&ion Shi-En Shiau 8c M. G. Landsiedel, Civil Engineering - AXE, 65(7), 1995, pp 70-71. The area studied is part of four separate alluvial fans built up by sedimentation deposits over thousands of years. Since natural drainage channels through this topography are generally unstable, project engineers have used ‘simultaneous dynamic simulations modeling’ to establish design parameters for the network of proposed channel improvements. Because the city’s geographic information system (GIS) will be used for their future management, all survey and data sets for the alignments demanded a high level of definition and had to conform to the symbology, layering and graphic standards brought on line with the city’s system. (from Authors) 963084 Statistical validation methods: application to unit hydrographs B. Zhao, Yeou-Koung Tung, Keh-Chia Yeh & Jinn-Chuang Yang, Journal of Hydraulic Engineering - ASCE, 121(8), 1995, pp 618-624. Five potentially useful statistical validation methods are presented. They were applied to examine the predictability of unit hydrographs derived by various methods in the framework of the least squares and its variations. It was found that storm-stacking (conventional multistorm analysis) together
Water pollution III: modelting, measuring and prediction Ed L. C. Wrobel & P. Latinopoulos, (Computational Mechanics Publications, Southampton), ISBN (hardback) 1 85312 310 2 (UK), 156252 234 5 (US), 1995, 526 pp. This book contains the papers presented at the third international conference held in Porto Carras, Greece in 1995. The main objective of the proceedings is to provide rapid dissemination and exchange of information on developments in water pollution and related environmental issues. The contents are divided into ten main sections each comprising between five and fifteen individual papers. The main sections are as follows: groundwater and aquifer contamination; lakes, rivers and channels; coastal pollution; sewage outfalls; watewater treatment; agricultural pollution; heavy metals; management aspects; statistical models and data acquisition/modelling. (S.E.Long) 963076 Prediction of interwell tracer flow bebaviour in beterogeneous reservoirs Tongchun Yi, T. Sezgin Daltaban & R. A. Dawe, Transport in Porous Media, 17(l), 1994, pp 59-75. A new numerical approach has been developed for predicting the interwell tracer flow behaviour in heterogeneous porous media typical of water and oil reservoirs. This approach uses a mixed finite-element method with triangular elements to predict pressure. and velocity fields, and a novel random walk model to simulate the tracer transport through the reservoir, and to predict the concentration response at the production well. (from Authors) 963077 MFE-TRANSP: one-dimensional moving-finite-element program for modeling solute transport in porous media G. Gottardi & M. Venutelli, Computers & Geosciences, 21(S), 1995, pp 663-685. The dynamically self-adaptive moving-finite-element (MFE) grid method, used in this program, obtains accurate and efficient solutions of the advection-dispersion equation for a wide range of Courant and Peclet numbers. The program accurately simulates, with no oscillations, steep fronts using space and time step sizes well beyond conventional constraints of the Peclet and Courant numbers. (from Authors) 963078 Hydraulic radius and transport in reconstructed model three-dimensional porous media D. P. Bentz & N. S. Martys, Transport in Porous Media, 17(3), 1994, pp 221-238. Many processes such as filtration and catalysis and the durability of many materials such as concrete are highly dependent on the underlying transport properties of the relevant microstructure. Here methods for reconstructing three-dimensional porous media from two-dimensional cross sections are evaluated in terms of the transport properties of the reconstructed systems. (from Authors) 963079 II problema inverse nei modelli di simulazione dei deflussi sotterranei: an&i comparativa di aicuni metodi risolutivi (The inverse problem for groundwater flow simulation models: comparative analysis of some solution methods) A. Criminisi & T. Tucciarelli, Energia Elettrica, 72(2), 1995, pp 50-55. The groundwater flow model calibration is studied by comparing four different methodologies: 1) the direct method; 2) the maximum likelihood method; 3) the Hubert robust estimation method and 4) the minimum residual method. After a short review of the theory, the results of Monte Carlo experiments carried out with a synthetic example are discussed. The results lead to a good validation of the second and fourth methods, whereas the third one exhibits convergence problems without a meaningful improvement in the parameter estimation. (English summary)
FLOW
1llA
963080
Radionuclide migration experiments under laboratory conditions T. T. Vandergraaf, Geophysical Research Letters, 22(11), 1995, pp 1409-1412. Results are presented from a series of migration experiments performed in a natural fracture in a quarried block of granite with overall dimensions of 81 x 90 x 75 cm. Results show that the behaviour of radioisotopes is usually more complex than can be represented by a-simple, reversible sorption coefficient (K-1. \ .., However. the transuort models that use this simple K, tend to give conservative &mates of contaminant transport in environmental and safety assessment calculations. (from Author) 963081 Analysis of radionuclide transport through fissured porous media with a perturbation method M. Banat, Nuclear Geophysics, 9(2), 1995, pp 107-120. This paper presents a specific procedure for obtaining solutions for the transport of radionuclides in a fissured porous media. The concentration profiles are deduced for a wide range of Peclet numbers using a perturbation method with a multiscale of time. Results show clearly that because of an increase of longitudinal dispersion, the radionuclide moves faster with respect to the case of zero dispersion (i.e. an infinite Peclet number). (from Author) 963082
Migration of radionuclides from a deep geological repositorv: analvtical model with radial diffusion in host matrix R. -N. Nai; & T. M. Krishnamoorthy, Nuclear Geophysics, 9(3), 1995, pp 219-228. A mathematical model has been developed to study the migration of radionuclides through a single fracture from a high-level radioactive waste repository located in deep geological granite formations. The model utilizes two coupled equations; one for the fracture and the other for the host rock. Results indicate steep gradients in the radionuclide concentrations within the first 50 m along the fracture axis. It is observed that about 99% of the radioactivity is retained by the host rock. The radionuclide concentration in the fracture water increases as the fracture radius increases until a critical fracture radius is reached. Thereafter the concentration decreases due to the increase in the volumetric flux of water. The magnitude of the critical fracture radius mainly depends on the fracture water velocity. (from Authors) 963083 Stormwater management so&ion Shi-En Shiau 8c M. G. Landsiedel, Civil Engineering - AXE, 65(7), 1995, pp 70-71. The area studied is part of four separate alluvial fans built up by sedimentation deposits over thousands of years. Since natural drainage channels through this topography are generally unstable, project engineers have used ‘simultaneous dynamic simulations modeling’ to establish design parameters for the network of proposed channel improvements. Because the city’s geographic information system (GIS) will be used for their future management, all survey and data sets for the alignments demanded a high level of definition and had to conform to the symbology, layering and graphic standards brought on line with the city’s system. (from Authors) 963084 Statistical validation methods: application to unit hydrographs B. Zhao, Yeou-Koung Tung, Keh-Chia Yeh & Jinn-Chuang Yang, Journal of Hydraulic Engineering - ASCE, 121(8), 1995, pp 618-624. Five potentially useful statistical validation methods are presented. They were applied to examine the predictability of unit hydrographs derived by various methods in the framework of the least squares and its variations. It was found that storm-stacking (conventional multistorm analysis) together