Identification of the Spawning, Rearing, and Migratory Requirements of Fall Chinook Salmon in the Columbia River Basin : Annual Report 1996-1997. (open access)

Identification of the Spawning, Rearing, and Migratory Requirements of Fall Chinook Salmon in the Columbia River Basin : Annual Report 1996-1997.

None
Date: February 1, 1999
Creator: Tiffan, Kenneth F. & Rondorf, Dennis W.
Object Type: Report
System: The UNT Digital Library
Burial Ground Expansion Hydrogeologic Characterization (open access)

Burial Ground Expansion Hydrogeologic Characterization

Sirrine Environmental Consultants provided technical oversight of the installation of eighteen groundwater monitoring wells and six exploratory borings around the location of the Burial Ground Expansion.
Date: February 26, 1999
Creator: Gaughan , T. F.
Object Type: Report
System: The UNT Digital Library
PC/FRAM, Version 3. 2 User Manual (open access)

PC/FRAM, Version 3. 2 User Manual

This manual describes the use of version 3.2 of the PC/FRAM plutonium isotopic analysis software developed in the Safeguards Science and Technology Group, NE-5, Nonproliferation and International Security Division Los Alamos National Laboratory. The software analyzes the gamma ray spectrum from plutonium-bearing items and determines the isotopic distribution of the plutonium 241Am content and concentration of other isotopes in the item. The software can also determine the isotopic distribution of uranium isotopes in items containing only uranium. The body of this manual descnies the generic version of the code. Special facility-specific enhancements, if they apply, will be described in the appendices. The information in this manual applies equally well to version 3.3, which has been licensed to ORTEC. The software can analyze data that is stored in a file on disk. It understands several storage formats including Canberra's S1OO format, ORTEC'S chn' and SPC' formats, and several ASCII text formats. The software can also control data acquisition using an MCA and then store the results in a file on disk for later analysis or analyze the spectrum directly after the acquisition. The software currently only supports the control of ORTEC MCB'S. Support for Canbema's Genie-2000 Spectroscopy Systems will be added …
Date: February 23, 1999
Creator: Kelley, T. A. & Sampson, T. E.
Object Type: Report
System: The UNT Digital Library
Investigation of in situ hydrothermal oxidative destruction of NDMA (open access)

Investigation of in situ hydrothermal oxidative destruction of NDMA

Rate constants for the aqueous oxidation of N-nitrosodimethylamine (NDMA) have been measured in aqueous phosphate-buffered solutions using Dickson-type vessels. The initial NDMA concentrations ranged from 2.5 to 2.8 ppm and reaction temperatures varied from 180 C to 220 C. Quantitation of NDMA was performed by gas chromatography-mass spectrometry (GC-MS) using selected ion monitoring (SIM). NDMA loss with concomitant production of nitrite and nitrate confirmed that mineralization of NDMA occurred, and no intermediates amenable to GC-MS were formed during the oxidation experiments. First order reaction rate constants for the loss of NDMA were determined by the integral method and the results are as follows: k{sub 1} = 5.21 x 10{sup -7} s{sup -1} at 180 C, k{sub 1} = 1.14 x 10{sup -6} s{sup -1} at 190 C, k{sub 1} = 2.05 x 10{sup -6} s{sup -1} at 200 C, k{sub 1} = 4.53 x 10{sup -6} s{sup -1} at 210 C and k{sub 1} = 8.81 x 10{sup -6} s{sup -1} at 220 C. The Arrhenius equation for this data is listed below: ln (k) = 20.21 - 15716 (1/T). The activation energy for this process is calculated to be 130.7 {+-} 3.5 kJ/mole. Extrapolating to a temperature of 125 …
Date: February 25, 1999
Creator: Leif, R N; Knauss, K G & Aines, R D
Object Type: Report
System: The UNT Digital Library
Search for Squarks and Gluinos in Events Containing Jets and a Large Imbalance in Transverse Energy (open access)

Search for Squarks and Gluinos in Events Containing Jets and a Large Imbalance in Transverse Energy

Using data corresponding to an integrated luminosity of 79 pb{sup -1}, D0 has searched for events containing multiple jets and large missing transverse energy in p{bar p} collisions at {radical}s = 1.8 TeV at the Fermilab Tevatron collider. Observing no significant excess beyond what is expected from the standard model, they set limits on the masses of squarks and gluinos and on the model parameters m{sub 0} and m{sub 1/2}, in the framework of the minimal low-energy supergravity models of supersymmetry. For tan {beta} = 2 and A{sub 0} = 0, with {mu} < 0, they exclude all models with m{sub q} {approx} < 250 GeV/c{sup 2}. For models with equal squark and gluino masses, they exclude m < 260 GeV/c{sup 2}.
Date: February 1, 1999
Creator: Abbott, B.; Abolins, M.; Abramov, V.; Acharya, B. S.; Adam, I.; Adams, D. L. et al.
Object Type: Article
System: The UNT Digital Library
Validation Testing of the Nitric Acid Dissolution Step Within the K Basin Sludge Pretreatment Process (open access)

Validation Testing of the Nitric Acid Dissolution Step Within the K Basin Sludge Pretreatment Process

No abstract is available for this document at this time.
Date: February 24, 1999
Creator: Schmidt, Andrew J.; Delegard, Calvin H.; Silvers, Kurt L.; Bredt, Paul R.; Carlson, Clark D.; Hoppe, Eric W. et al.
Object Type: Report
System: The UNT Digital Library
Interim report on task 1.4: impurity effects part 2 of 2 appendices to Lawrence Livermore National Laboratory for contract b345772 (open access)

Interim report on task 1.4: impurity effects part 2 of 2 appendices to Lawrence Livermore National Laboratory for contract b345772

None
Date: February 26, 1999
Creator: Stewart, M W A; Vance, E R & Day, R A
Object Type: Report
System: The UNT Digital Library
Evaluation of Infrasound and Strobe Lights to Elicit Avoidance Behavior in Juvenile Salmon and Char. (open access)

Evaluation of Infrasound and Strobe Lights to Elicit Avoidance Behavior in Juvenile Salmon and Char.

Experimental tests were conducted using hatchery reared and wild juvenile chinook salmon Oncorhynchus tshawytscha, eastern brook trout Salvelinus fontinalis, and rainbow trout O. mykiss to determine specific behavior responses to infrasound (<20 Hz) and flashing strobe lights. Caged fish were acclimated in a static test tank and their behavior was recorded using low light cameras. Species specific behavior was characterized by measuring movements of the fish within the cage as well as observing startle and habituation responses. Wild chinook salmon (40-45 mm) and hatchery reared chinook salmon (45-50mm) exhibited avoidance responses when initially exposed to a 10 Hz volume displacement source. Rainbow and eastern brook trout (25-100 mm) did not respond with avoidance or other behaviors to infrasound. Habituation to the infrasound source was evident for chinook salmon during repeated exposures. Wild and hatchery chinook displayed a higher proportion of movement during the initial exposures to infrasound when the acclimation period in the test tank was 2-3 h as compared to a 12-15 h acclimation period. A flashing strobe light produced higher and more consistent movement rates in wild chinook (60% of the tests); hatchery reared chinook salmon (50%) and rainbow trout (80%). No measurable movement or other responses was …
Date: February 1, 1999
Creator: Mueller, Robert, P.; Neitzel, Duane A. & Amidan, Brett G.
Object Type: Report
System: The UNT Digital Library
Radionuclide Coefficients for the BNL Site: For the Saturated and Unsaturated Zones (open access)

Radionuclide Coefficients for the BNL Site: For the Saturated and Unsaturated Zones

The partition coefficient (K{sub d}) is defined as the concentration of a species of interest on the solid phase divided by the concentration of that species in the liquid phase, at steady-state. Therefore the lower the K{sub d}, the less sorption takes place. It is a parameter that is readily incorporated in chemical transport models. The K{sub d} approach to the partitioning of contaminants between soil and water in groundwater flow systems, is based on the assumption that sorption reactions are in equilibrium and are reversible. As a contaminant plume advances along flow paths, the movement of the front is retarded (relative to the movement of the groundwater) as a result of transfer of part of the contamination mass to the solid phase. If the input of contaminant mass to the system is discontinued, contaminants will be transferred back to the liquid phase as lower-concentration water flushes through the previously contaminated zone. Several sets of soil/water partition coefficients (K{sub d}) have been measured using BNL site specific soils and groundwater (with tracers added). They were all reported earlier through internal memos or reports. The K{sub d}s obtained for various radionuclides are determined experimentally with soils taken from different locations and …
Date: February 1999
Creator: Fuhrmann, Mark
Object Type: Report
System: The UNT Digital Library
Lake Roosevelt Rainbow Trout : Habitat/Passage Improvement Project : Annual Report 1998. (open access)

Lake Roosevelt Rainbow Trout : Habitat/Passage Improvement Project : Annual Report 1998.

Lake Franklin D. Roosevelt was created with the completion of the Grand Coulee Dam in 1942. The lake stretches 151 miles up-stream to the International border between the United States and Canada at the 49th parallel. Increased recreational use, subsistence and sport fishing has resulted in intense interest and possible exploitation of the resources within the lake. Previous studies of the lake and its fishery have been limited. Early studies indicate that natural reproduction within the lake and tributaries are not sufficient to support a rainbow trout (Onchoryhnchus mykiss) fishery (Scholz et. al., 1988). These studies indicate that the rainbow trout population may be limited by lack of suitable habitat for spawning and rearing (Scholz et. al., 1988). The initial phase of this project (Phase I, baseline data collection) was directed at the assessment of limiting factors such as quality and quantity of available spawning gravel, identification of passage barriers, and assessment of other limiting factors. Population estimates were conducted using the Seber/LeCren removal/depletion method. After the initial assessment of stream parameters, several streams were selected for habitat/passage improvement projects (Phase II, implementation). At the completion of project habitat improvements, the final phase (Phase III, monitoring) began. This phase will …
Date: February 1, 1999
Creator: Jones, Charles D.
Object Type: Report
System: The UNT Digital Library
Kootenai River Fisheries Investigations : Rainbow Trout Recruitment : Period Covered: 1997. (open access)

Kootenai River Fisheries Investigations : Rainbow Trout Recruitment : Period Covered: 1997.

The objective of this study was to determine if juvenile production is limiting the population of rainbow trout Oncorbynchus mykiss in the Idaho reach of the Kootenai River. We used snorkeling and electrofishing techniques to estimate juvenile rainbow trout abundance in, and outmigration from, the Deep, Boulder, and Myrtle creek drainages in Idaho. The total population estimates for the three drainages estimated in 1997 were 30,023; 763; and 235; respectively. A rotary-screw trap was utilized to capture juvenile outmigrants for quantification of age at outmigration and total outmigration from the Deep Creek drainage to the Kootenai River. The total outmigrant estimate for 1997 from the Deep Creek drainage was 38,206 juvenile rainbow trout. Age determination based largely on scales suggests that most juvenile rainbow trout outmigration from the Deep Creek drainage occurs at age-l, during the spring runoff period. Forty-three adult rainbow trout captured in the Deep Creek drainage were tagged with $10.00 reward T-bar anchor tags in 1997. A total of three of these fish were harvested, all in Kootenay Lake, British Columbia. This suggests the possibility of an adfluvial component in the spawning population of the Deep Creek drainage.
Date: February 2, 1999
Creator: Downs, Chris
Object Type: Report
System: The UNT Digital Library
A study of the {sup 16}O (e, e'p) reaction at deep missing energies (open access)

A study of the {sup 16}O (e, e'p) reaction at deep missing energies

The {sup 16}O(e,e'p)#8; reaction was studied in the #6;first physics experiment performed at Jefferson lab Hall A. In the quasielastic region cross sections were measured for both quasi#11;parallel and perpendicular kinematics at q = 1000 MeV and #2;{omega} = 445#14;#14;#15; MeV. From the data acquired in quasi#11;parallel kinematics#4; longitudinal and transverse response functions#4; R{sub L} and R{sub T} were separated for E{sub miss} < 60 MeV. The perpendicular kinematics data were used to extract R{sub LT}, #4; R{sub T},#4; and R{sub L#16;} + V{sub TT}/V{sub L}R{sub TT} response functions for the same E{sub miss} range and for P{sub miss} < 310 MeV#18;c. The {sub 16}O(#7;e,#4;e'p)#8; cross section was measured in the dip region at q = 1026 MeV and #2; {omega} = 586#12;#15;#19;#2; MeV for 10 MeV <#3; E{sub miss} < 320 MeV. This thesis presents the results for the missing energy continuum (#7;E{sub miss}>25#4; #3;#15; MeV)#8; from this experiment.
Date: February 1, 1999
Creator: Liyanage, Nilanga
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Thermal Analysis of the 9975 Package with the 3013 Configuration During Normal Conditions of Transport (open access)

Thermal Analysis of the 9975 Package with the 3013 Configuration During Normal Conditions of Transport

Thermal analysis of the 9975 package with three configurations of the BNFL 3013 outer container (with Rocky Flats, SRS, and BNFL inner containers) have been performed for Normal Conditions of Transport (NCT) of plutonium oxide and metal. The NCT is defined in 10 CFR 71.71(c)(1) s an ambient of 100 F (38 C) in still air with 800 W/m{sup 2} and 400 W/m{sup 2} of solar heating on the drum top and sides, respectively. The 9975 drum package is considered to be in an upright position, and the drum bottom is adiabatic. The Rocky and SRS 3013 configurations with Pu metal contents (19 watts) result in acceptable (similar) packaging temperatures, however the plutonium metal temperatures are lower for the SRS design (SRS has helium fill gas whereas Rocky is essentially air filled). The BNFL configuration for Pu oxide contents (19 watts) result in acceptable temperatures and pressures based on limits in the 9975 Safety Analysis Report (SARP). However, for 30 watts of Pu oxide, the fiberboard peak temperatures are very near the SARP allowable. The pressure in the 3013 container is 688.4 psig for the 30 watt Pu oxide content and 569.5 psig for the 19 watt Pu oxide content. …
Date: February 22, 1999
Creator: Hensel, S
Object Type: Report
System: The UNT Digital Library
Models for the Configuration and Integrity of Partially Oxidized Fuel Rod Cladding at High Temperatures - Final Design Report (open access)

Models for the Configuration and Integrity of Partially Oxidized Fuel Rod Cladding at High Temperatures - Final Design Report

Models were designed to resolve deficiencies in the SCDAP/RELAP5/MOD3.2 calculations of the configuration and integrity of hot, partially oxidized cladding. The modeling was improved in five areas. First, the configuration defined for melted metallic cladding retained by an adjacent oxide layer was improved. Second, the empirical model to account for the effect on oxidation of intact cladding is not significantly reduced by the presence of a rather high concentration of relocated material. Third, models for the dissolution of the oxide layer by the metallic layer were implemented into the code. Fourth, a model was added to calculate the thermal stress applied to the oxide layer by the temperature gradient across the oxide layer and to compare this stress to the ultimate strength of the oxide layer. Fifth, a new rule based on theoretical and experimental results was established for identifying the regions of a fuel rod with oxidation of both the inside and outside surfaces of the cladding. The assessment of these models and their integration into SCDAP/RELAP5 showed that the calculated axial distribution in cladding oxidation and relocation are in significantly better agreement with experimental results than is currently the case. The modeling changes account for three aspects of …
Date: February 1, 1999
Creator: Siefken, Larry James
Object Type: Report
System: The UNT Digital Library
INEEL Radiological Control Performance Indicator Report - Quarterly (open access)

INEEL Radiological Control Performance Indicator Report - Quarterly

This document provides a report of an analysis of the Radiological Control Program through the fourth quarter of Calendar Year (CY-98) and is the annual report for the Idaho National Engineering and Environmental Laboratory (INEEL). This Performance Indicator Report is provided in accordance with Article 133 of the INEEL Radiological Control Manual. The INEEL collective occupational radiation deep dose is 63.034 person-rem year to date, compared to a goal of 83.1 person-rem. During the fourth quarter, all areas experienced deletions of work resulting from the Maintenance Stand Down. This reduction in work is a primary factor in the difference in the year end dose and the ALARA goal. The work will be completed during CY-99. Beginning in CY-98, a numeric Radiological Performance Index (RPI) is being used to compare radiological performance. The RPI takes into consideration frequency and severity of events such as skin contaminations, clothing contaminations, spills, exposures to radiation exceeding limits, and positive internal dose. The RPI measures the cost of these events in cents per hour of radiological work performed. To make the RPI meaningful, tables have been prepared to show the facility that contributes to the values used. The data are compared on a quarterly basis …
Date: February 1, 1999
Creator: Hinckley, Frank Leroy
Object Type: Report
System: The UNT Digital Library
Development of a SREX Flowsheet for the Separation of Strontium from Dissolved INEEL Zirconium Calcine (open access)

Development of a SREX Flowsheet for the Separation of Strontium from Dissolved INEEL Zirconium Calcine

Laboratory experimentation has indicated that the SREX process is effective for partitioning 90 Sr from acidic radioactive waste solutions located at the Idaho Nuclear Technology and Engineering Center. These laboratory results were used to develop a flowsheet for countercurrent testing of the SREX process with dissolved pilot plant calcine. Testing was performed using 24 stages of 2-cm diameter centrifugal contactors which are installed in the Remote Analytical Laboratory hot cell. Dissolved Run #64 pilot plant calcine spiked with 85 Sr was used as feed solution for the testing. The flowsheet tested consisted of an extraction section (0.15 M 4',4'(5')-di-(tert-butylcyclohexo)-18-crown-6 and 1.5 M TBP in Isopar-L.), a 1.0 M NaNO3 scrub section to remove extracted K from the SREX solvent, a 0.01 M HNO3 strip section for the removal of Sr from the SREX solvent, a 0.25 M Na2CO3 wash section to remove degradation products from the solvent, and a 0.1 M HNO3 rinse section. The behavior of 85 Sr, Na, K, Al, B, Ca, Cr, Fe, Ni, and Zr was evaluated. The described flowsheet successfully extracted 85 Sr from the dissolved pilot plant calcine with a removal efficiency of 99.6%. Distribution coefficients for 85 Sr ranged from 3.6 to 4.5 …
Date: February 1, 1999
Creator: Law, Jack Douglas; Wood, David James & Todd, Terry Allen
Object Type: Report
System: The UNT Digital Library
Telephone Flat Geothermal Development Project Environmental Impact Statement Environmental Impact Report. Final: Comments and Responses to Comments (open access)

Telephone Flat Geothermal Development Project Environmental Impact Statement Environmental Impact Report. Final: Comments and Responses to Comments

This document is the Comments and Responses to Comments volume of the Final Environmental Impact Statement and Environmental Impact Report prepared for the proposed Telephone Flat Geothermal Development Project (Final EIS/EIR). This volume of the Final EIS/EIR provides copies of the written comments received on the Draft EIS/EIR and the leady agency responses to those comments in conformance with the requirements of the National Environmental Policy Act (NEPA) and the California Environmental Quality Act (CEQA).
Date: February 1, 1999
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Preliminary Design Report for Modeling of Hydrogen Uptake in Fuel Rod Cladding During Severe Accidents (open access)

Preliminary Design Report for Modeling of Hydrogen Uptake in Fuel Rod Cladding During Severe Accidents

Preliminary designs are described for models of hydrogen and oxygen uptake in fuel rod cladding during severe accidents. Calculation of the uptake involves the modeling of seven processes: (1) diffusion of oxygen from the bulk gas into the boundary layer at the external cladding surface, (2) diffusion from the boundary layer into the oxide layer, (3) diffusion from the inner surface of the oxide layer into the metallic part of the cladding, (4) uptake of hydrogen in the event that the clad-ding oxide layer is dissolved in a steam-starved region, (5) embrittlement of cladding due to hydrogen uptake, (6) cracking of cladding during quenching due to its embrittlement and (7) release of hydrogen from the cladding after cracking of the cladding. An integral diffusion method is described for calculating the diffusion processes in the cladding. Experimental results are presented that show a rapid uptake of hydrogen in the event of dissolution of the oxide layer and a rapid release of hydrogen in the event of cracking of the oxide layer. These experimental results are used as a basis for calculating the rate of hydrogen uptake and the rate of hydrogen release. The uptake of hydrogen is limited to the equilibrium …
Date: February 1, 1999
Creator: Siefken, Larry James
Object Type: Report
System: The UNT Digital Library
Human Mammary Luminal Epithelial Cells Contain Progenitors to Myoepithelial Cells (open access)

Human Mammary Luminal Epithelial Cells Contain Progenitors to Myoepithelial Cells

The origin of the epithelial and myoepithelial cells in the human breast has not been delineated. In this study we have addressed whether luminal epithelial cells and myoepithelial cells are vertically connected, i.e., whether one is the precursor for the other. We used a primary culture assay allowing preservation of basic phenotypic traits of luminal epithelial and myoepithelial cells in culture. The two cell types were then separated immunomagnetically using antibodies directed against lineage-specific cell surface antigens into at best 100% purity. The cellular identity was ascertained by cytochemistry, immunoblotting, and 2-D gel electrophoresis. Luminal epithelial cells were identified by strong expression of cytokeratins 18 and 19 while myoepithelial cells were recognized by expression of vimentin and {alpha}-smooth muscle actin. We used a previously devised culture medium (CDM4) that allows vigorous expansion of proliferative myoepithelial cells and also devised a medium (CDM6) that allowed sufficient expansion of differentiated luminal epithelial cells based on addition of hepatocyte growth factor/scatter factor. The two different culture media supported each lineage for at least five passages without signs of interconversion. We used parallel cultures where we switched culture media, thus testing the ability of each lineage to convert to the other. Whereas the myoepithelial …
Date: February 1, 1999
Creator: Pechoux, Christine; Gudjonsson, Thorarinn; Ronnov-Jessen, Lone; Bissell, Mina J & Petersen, Ole
Object Type: Article
System: The UNT Digital Library
Beam Test of High-Performance Hadron Calorimeter for Future Linear Colliders (open access)

Beam Test of High-Performance Hadron Calorimeter for Future Linear Colliders

None
Date: February 1, 1999
Creator: Arisaka, Katsushi; /UCLA; Fujii, Yoshiaki; Kanzaki, Jun'ichi; /KEK, Tsukuba; Kanaya, Naoko et al.
Object Type: Report
System: The UNT Digital Library
Large-eddy simulation of the stable boundary layer and implications for transport and dispersion (open access)

Large-eddy simulation of the stable boundary layer and implications for transport and dispersion

Large-eddy simulation (LES) of the evolving stable boundary layer (SBL) provides unique data sets for assessing the effects of stable stratification on transport and dispersion. The simulations include the initial development of the convective boundary layer (CBL) in the afternoon, followed by the development of an SBL after sunset with a strong, surface-based temperature inversion. The structure of the turbulence is modified significantly by negative buoyancy associated with the temperature inversion. The magnitude of velocity variances is reduced by an order of magnitude compared to that in the CBL, and the vertical velocity variance is damped further as the static stability preferentially damps vertical motions. The advanced subgrid-scale turbulence model allows simulation of intermittently enhanced periods of turbulence in the SBL that am often observed. During these turbulent episodes, mixing is increased within the SBL. Air pollution models that account only for the long-term mean structure of the SBL do not include the effects of these episodes. In contrast, our LES results imply that material released near the surface and mixed to higher elevations would be transported by stronger winds and in different directions, due to the vertical shear of horizontal wind speed and direction. Material released at altitude in …
Date: February 1, 1999
Creator: Cederwall, R T & Street, R L
Object Type: Article
System: The UNT Digital Library
LADS Phase 2 Evaluation Criteria (open access)

LADS Phase 2 Evaluation Criteria

None
Date: February 23, 1999
Creator: Sellers, M.
Object Type: Report
System: The UNT Digital Library
Use of the Continuity Equation for Electromagnetic Energy Flow to Describe Radiation Transport (open access)

Use of the Continuity Equation for Electromagnetic Energy Flow to Describe Radiation Transport

The continuity equation for electromagnetic (EM) energy flow is used to describe radiation flow in the transport regime. The scheme of a discrete representation of H<sub>z</sub> and a stochastic representation of H<sub>x</sub>, H<sub>y</sub> gives an effectively continuous representation of directed energy in the x-y plane, such that the ray effect of transport theory is absent. Since the in-plane amplitudes are generated at each time step, it is necessary to store only the perpendicular amplitudes and the results appear to be robust with respect to the coarse of this discretization.
Date: February 5, 1999
Creator: Ritchie, A. B.
Object Type: Report
System: The UNT Digital Library
Enabling computational technologies for subsurface simulations (open access)

Enabling computational technologies for subsurface simulations

We collaborated with Environmental Programs to develop and apply advanced computational methodologies for simulating multiphase flow through heterogeneous porous media. The primary focus was on developing a fast accurate advection scheme using a new temporal subcycling technique and on the scalable and efficient solution of the nonlinear Richards' equation used to model two-phase (variably saturated) flow. The resulting algorithms can be orders-of-magnitude faster than existing methods. Our computational technologies were applied to the simulation of subsurface fluid flow and chemical transport in the context of two important applications: water resource management and groundwater remediation.
Date: February 22, 1999
Creator: Falgout, R D
Object Type: Report
System: The UNT Digital Library