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SPECIAL SECTION: RESEARCH ADVANCES IN VADOSE ZONE HYDROLOGY THROUGH SIMULATIONS WITH THE TOUGH CODES

A Mountain-Scale Model for Characterizing Unsaturated Flow and Transport in Fractured Tuffs of Yucca Mountain

Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720
^* Corresponding author (yswu{at}lbl.gov)

Received 26 August 2003.

We present a large-scale modeling study characterizing fluid flow and tracer transport in the unsaturated zone (UZ) of Yucca Mountain, Nevada, the proposed underground repository site for storing high-level radioactive waste. The modeling study is conducted using a three-dimensional numerical model, which incorporates a wide variety of field data and takes into account the coupled processes of flow and transport in Yucca Mountain's highly heterogeneous, unsaturated, fractured porous rock. The modeling approach is based on a dual-continuum formulation. Using different conceptual models of unsaturated flow, various scenarios of current and future climate conditions and their effects on the UZ are evaluated to aid in the assessment of the repository's system performance. These models are calibrated against field-measured data. Model-predicted flow and transport processes under current and future climates are discussed.

Abbreviations: CFu, Crater Flat undifferentiated unit • CHn, the Calico Hills nonwelded unit • ESF, Exploratory Studies Facilities • PTn, Paintbrush nonwelded unit • TCw, Tiva Canyon welded hydrogeologic unit • TSw, Topopah Spring welded unit • UZ, unsaturated zone

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