Numerical studies of rock-gas flow in Yucca Mountain; Yucca Mountain Site Characterization Project

Ross, Benjamin; Amter, Steven; Lu, Ning

doi:10.2172/138372

Cited by 6 publications

(11 citation statements)

References 12 publications

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“…Mountain (Ross, 1992). The temperature gradient is straightfonvard in that it varies linearly with elevation with the exception of the topographic effects near the mountain surface.…”

Section: --mentioning

confidence: 99%

“…A common assumption in 14C studies is to assume that the concentrations of 1* are proportional to those of '% (Ross et al ¶ 1992). Therefore, equations (36)- (38) hold for 14C.…”

Section: --mentioning

confidence: 99%

“…Calcite is present in Yucca Mountain core samples from the unsaturated zone. In addition, calcite precipitation-dissolution kinetics are fast relative to the groundwater flow suggesting that equilibrium saturation with calcite is a reasonable assumption in the unsaturated zone of Yucca Mountain (Ross, 1992, Meijer, 1993. In this simulation, FBHMN will be used to model and open system in equilibrium with calcite ( Figure 25).…”

Section: Carbonate System Chemistry In a Closed Systemmentioning

confidence: 99%

“…Transport studies of 14C that have already been conducted within the Yucca Mountain Project take an "equivalent l & j ' approach to simulate the partitioning of 14C between the liquid and vapor phases (Ross, 1992). The equivalent & is a function of pH and temperature and is often obtained from using equilibrium geochemical codes to simulate the complex chemistry (equation (40)).…”

Section: O -mentioning

confidence: 99%

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Modification of the finite element heat and mass transfer code (FEHMN) to model multicomponent reactive transport

Viswanathan¹

1995

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“…Mountain (Ross, 1992). The temperature gradient is straightfonvard in that it varies linearly with elevation with the exception of the topographic effects near the mountain surface.…”

Section: --mentioning

confidence: 99%

“…A common assumption in 14C studies is to assume that the concentrations of 1* are proportional to those of '% (Ross et al ¶ 1992). Therefore, equations (36)- (38) hold for 14C.…”

Section: --mentioning

confidence: 99%

Section: Carbonate System Chemistry In a Closed Systemmentioning

confidence: 99%

Section: O -mentioning

confidence: 99%

See 2 more Smart Citations

Modification of the finite element heat and mass transfer code (FEHMN) to model multicomponent reactive transport

Viswanathan¹

1995

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“…Calcite is present in Yucca Mountain core samples from the unsaturated zone. In addition, calcite precipitation-dissolution kinetics are fast relative to the groundwater flow suggesting that equilibrium saturation with calcite is a reasonable assumption in the unsaturated zone of Yucca Mountain (Ross, 1992, Meijer, 1993. In this simulation, FEHM.N will be used to model and open system in'equilibrium with calcite ( Figure 25).…”

Section: Ctco~ = P2co;] + [Hcot] + [Cot]mentioning

confidence: 99%

Modification of the finite element heat and mass transfer code (FEHM) to model multicomponent reactive transport

Viswanathan¹

1996

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MODIFICATION OF THE FINITE ELEMENT HEAT AND MASS TRANSFER CODE (FEHMN) TO MODEL MULTICOMPONENT REACTIVE TRANSPORTHari Selvi Viswanathan ABSTRACTThe finite element code FEHMN, developed by scientists at Los Alamos National Laboratory (LANL), is a three-dimensional finite element heat &d mass transport simulator that can handle complex stratigraphy and nonlinear processes such as vadose zone flow, heat flow and solute transport. Scientists at LANL have been developing hydrologic flow and transport models of the Yucca Mountain site using FEHMN. Previous FEHMN simulations have used an equivalent &model to model solute transport. In this thesis, FEHMN is modified making it possible to simulate the transport of a species with a rigorous chemical model. Including the rigorous chemical equations into FEHMN simulations should provide for more representative transport models for highly reactive chemical species.A fully kinetic formulation is chosen for the FEHMN reactive transport model. Several methods are available to computationally implement a fully kinetic formulation. Different numerical algorithms are investigated in order to optimize computational efficiency and memory requirements of the reactive transport model. The best algorithm of those investigated is then incorporated into FEHMN. The algorithm chosen requires for the user to place strongly coupled species into groups which are then solved for simultaneously using FEHMN. The complete reactive transport model is verified over a wide variety of problems and is shown to be working properly.The new chemical capabilities of FEHMN are illustrated by using Los Alamos National Laboratory's site scale model of Yucca Mountain to model two-dimensional, vadose zone 14C transport. The simulations demonstrate that gas flow and carbonate chemistry can significantly affect 14C transport at Yucca Mountain. The simulations also prove that the new capabilities of FEHMN can can be used to refine and buttress already existing Yucca Mountain radionulcide transport studies. xiv

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An analytical assessment on the impact of covers on the onset of air convection in mine wastes

2001

Num Anal Meth Geomechanics

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SUMMARYIf a mine waste pile is left open, an active chemical reaction of oxidation is often found due to the commonly high content of pyritic materials. The oxidation of pyrites is an exothermic process and the released heat will promote the #ow of fresh oxygen from the surrounding atmosphere into the waste dump. As a result, oxidation reaction will accelerate and temperature within the dump can increase to as high as 603C above the ambient temperature. The oxidation process also releases sulphuric acid and hydrogen ions into ground water to cause water contamination. Low-permeability covers such as clay liners have been recently proposed to abate the oxidation process in mine wastes. The e!ectiveness of using low-permeability materials to cover mine wastes in order to suppress the pyrite oxidation is examined. By conducting the theoretical analysis of the onset of convective air #ow within waste rocks, the conditions under which soil gas #ow is signi"cant are identi"ed. By comparing the results with previous "eld measurements and theoretical analysis for the uncovered conditions, it is shown that low-permeability covers can e!ectively suppress soil gas #ow and slow down the pyrite oxidation process in mine wastes.

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Numerical studies of rock-gas flow in Yucca Mountain; Yucca Mountain Site Characterization Project

Abstract: A computer model :,r,r, _ ,, t.,

Cited by 6 publications

References 12 publications

Modification of the finite element heat and mass transfer code (FEHMN) to model multicomponent reactive transport

Modification of the finite element heat and mass transfer code (FEHMN) to model multicomponent reactive transport

Modification of the finite element heat and mass transfer code (FEHM) to model multicomponent reactive transport

An analytical assessment on the impact of covers on the onset of air convection in mine wastes

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