Boundary integral methods for unsaturated flow

Conference · Sun Dec 30 23:00:00 EST 1990

OSTI ID:137978

Martinez, M J; McTigue, D F

Many large simulations may be required to assess the performance of Yucca Mountain as a possible site for the nations first high level nuclear waste repository. A boundary integral equation method (BIEM) is described for numerical analysis of quasilinear steady unsaturated flow in homogeneous material. The applicability of the exponential model for the dependence of hydraulic conductivity on pressure head is discussed briefly. This constitutive assumption is at the heart of the quasilinear transformation. Materials which display a wide distribution in pore-size are described reasonably well by the exponential. For materials with a narrow range in pore-size, the exponential is suitable over more limited ranges in pressure head. The numerical implementation of the BIEM is used to investigate the infiltration from a strip source to a water table. The net infiltration of moisture into a finite-depth layer is well-described by results for a semi-infinite layer if {alpha}D > 4, where {alpha} is the sorptive number and D is the depth to the water table. the distribution of moisture exhibits a similar dependence on {alpha}D. 11 refs., 4 figs.,

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 137978
• Report Number(s): SAND--90-2254C; CONF-910435--32; ON: DE91005964
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
54 ENVIRONMENTAL SCIENCES
ACCURACY
BOUNDARY-VALUE PROBLEMS
COMPUTER CODES
GAUSSIAN PROCESSES
HIGH-LEVEL RADIOACTIVE WASTES
HYDRAULICS
IMPLEMENTATION
INTEGRAL EQUATIONS
LEGENDRE POLYNOMIALS
MATHEMATICAL MODELS
NUMERICAL SOLUTION
PERMEABILITY
POROSITY
QUASILINEAR PROBLEMS
RADIOACTIVE WASTE DISPOSAL
RADIONUCLIDE MIGRATION
SATURATION
SITE CHARACTERIZATION
STEADY-STATE CONDITIONS
TWO-DIMENSIONAL CALCULATIONS
YUCCA MOUNTAIN
Yucca Mountain Project