Groundwater pathway sensitivity analysis and hydrogeologic parameters identification for waste disposal in porous media

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6362935

Yu, C

The migration of radionuclides in a geologic medium is controlled by the hydrogeologic parameters of the medium such as dispersion coefficient, pore water velocity, retardation factor, degradation rate, mass transfer coefficient, water content, and fraction of dead-end pores. These hydrogeologic parameters are often used to predict the migration of buried wastes in nuclide transport models. One of the most important factors determining the accuracy of predicting waste migration is the accuracy of the parameter values used in the model. More sensitive parameters have a greater influence on the results and hence should be determined (measured or estimated) more accurately than less sensitive parameters. A formal parameter sensitivity analysis is carried out in this paper. Parameter identification techniques to determine the hydrogeologic parameters of the flow system are discussed. The dependence of the accuracy of the estimated parameters upon the parameter sensitivity is also discussed. The results of the groundwater pathway analysis carried out in this study show that the degradation rate is a rather insensitive paremeter. The parameter identification techniques currently being used include linear and nonlinear regression methods. More sensitive parameters should be determined more accurately because they have a greater influence on the prediction results. 13 refs., 6 figs., 1 tab.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6362935
• Report Number(s): CONF-860205-2; ON: DE86004050
• Country of Publication: United States
• Language: English

Related Subjects

052002* -- Nuclear Fuels-- Waste Disposal & Storage
053000 -- Nuclear Fuels-- Environmental Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
520301 -- Environment
Aquatic-- Radioactive Materials Monitoring & Transport-- Water-- (1987)
54 ENVIRONMENTAL SCIENCES
ENVIRONMENTAL TRANSPORT
GEOLOGIC DEPOSITS
GROUND WATER
HYDROGEN COMPOUNDS
MANAGEMENT
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
POROUS MATERIALS
RADIOACTIVE WASTE DISPOSAL
RADIONUCLIDE MIGRATION
SENSITIVITY ANALYSIS
WASTE DISPOSAL
WASTE MANAGEMENT
WATER