CAPILLARY BARRIERS IN UNSATURATED FRACTURED ROCKS | Zendy

YuShu Wu | Zendy; W. Zhang | Zendy; Lina Pan | Zendy; J. Hinds | Zendy; G.S. Bodvarsson | Zendy

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CAPILLARY BARRIERS IN UNSATURATED FRACTURED ROCKS

Author(s) -

YuShu Wu,

W. Zhang,

Lina Pan,

J. Hinds,

G.S. Bodvarsson

Publication year - 2000

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/860283

Subject(s) - geology , hydrogeology , capillary action , vadose zone , tracer , geotechnical engineering , petrology , flow (mathematics) , porous medium , multiphase flow , fluid dynamics , flow properties , porosity , petroleum engineering , mechanics , materials science , groundwater , physics , nuclear physics , composite material

This work presents modeling studies investigating the effects of capillary barriers on fluid-flow and tracer-transport processes in the unsaturated zone of Yucca Mountain, Nevada, a potential site for storing high-level radioactive waste. These studies are designed to identify factors controlling the formation of capillary barriers and to estimate their effects on the extent of possible large-scale lateral flow in unsaturated fracture rocks. The modeling approach is based on a continuum formulation of coupled multiphase fluid and tracer transport through fractured porous rock. Flow processes in fractured porous rock are described using a dual-continuum concept. In addition, approximate analytical solutions are developed and used for assessing capillary-barrier effects in fractured rocks. This study indicates that under the current hydrogeologic conceptualization of Yucca Mountain, strong capillary-barrier effects exist for significantly diverting moisture flow

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