Applied tracer tests in fractured rock: Can we predict natural gradient solute transport more accurately than fracture and matrix parameters?

2006 ◽  
Vol 88 (3-4) ◽  
pp. 289-305 ◽  
Author(s):  
Douglas Weatherill ◽  
Peter G. Cook ◽  
Craig T. Simmons ◽  
Neville I. Robinson
Keyword(s):  
Solute Transport ◽  
Fractured Rock ◽  
Tracer Tests ◽  
Natural Gradient

A natural gradient experiment on solute transport in a sand aquifer: 1. Approach and overview of plume movement

1986 ◽  
Vol 22 (13) ◽  
pp. 2017-2029 ◽  
Author(s):  
D. M. Mackay ◽  
D. L. Freyberg ◽  
P. V. Roberts ◽  
J. A. Cherry
Keyword(s):  
Solute Transport ◽  
Natural Gradient ◽  
Sand Aquifer

Migration of Solutes in Unsaturated, Fractured Rock at Yucca Mountain: Measurements, Mechanisms, and Models

1995 ◽  
Vol 412 ◽  
Author(s):  
A. V. Wolfsberg ◽  
B. A. Robinson ◽  
J. T. Fabryka-Martin
Keyword(s):  
Solute Transport ◽  
Transport Model ◽  
Alternative Hypothesis ◽  
Fractured Rock ◽  
Yucca Mountain ◽  
Nuclear Waste Repository ◽  
Transport Studies ◽  
And Performance ◽  
High Level ◽  
A Site

AbstractCharacterization and performance assessment (PA) studies for the potential high-level nuclear waste repository at Yucca Mountain require an understanding of migration mechanisms and pathways of radioactive solutes. Measurements of 36C1 in samples extracted from boreholes at the site are being used in conjunction with recent infiltration estimates to calibrate a site-scale flow and solute transport model. This exercise using the flow and solute transport model, FEHM, involves testing different model formulations and two different hypotheses to explain the occurrence of elevated 36Cl in the Calico Hills unit (CHn) which indicates younger water than in the overlying Topopah Spring unit (TSw). One hypothesis suggests fast vertical transport from the surface via fractures in the TSw to the CHn. An alternative hypothesis is that the elevated 36C1 concentrations reflect rapid horizontal flow in the CHn or at the interface between the CHn and the TSw with the source being vertical percolation under spatially isolated regions of high infiltration or at outcrops of those units. Arguments in favor of and against the hypotheses are described in conjunction with the site-scale transport studies.

scholarly journals An experimental evaluation of the solute transport volume in biodegraded municipal solid waste

1999 ◽  
Vol 3 (3) ◽  
pp. 429-438 ◽  
Author(s):  
H. Rosqvist ◽  
D. Bendz
Keyword(s):  
Solute Transport ◽  
Solid Waste ◽  
Volume Fraction ◽  
Tracer Tests ◽  
Travel Times ◽  
Volume Fractions ◽  
Rapid Flow ◽  
Set Up ◽  
Log Normal ◽  
Transport Volume

Abstract. A large undisturbed sample (3.5 m3) of 22-year-old, biodegraded solid waste set up to estimate the volume fraction participating in the transport of solutes through the waste material. Altogether, five tracer tests were performed under ponding and sprinkling conditions, and under steady-state and transient conditions. The experimental break through curves (BTCs), which indicated a non-equilibrium transport of the solute by early peaks and long right-hand tails, were used to parameterize log-normal solute travel time probability density functions. The expected solute travel times (i.e. the median solute travel times) were assessed and the corresponding fraction of the experimental volumes active in the transport of solutes was estimated. The solute transport volume fractions defined by the median solute travel times were estimated to vary between 5 and 10% of the total experimental volume. Further, the magnitudes of the solute transport volume fractions defined by the modal (peak) solute travel times were estimated to vary between 1 and 2% of the total experimental volume. In addition, possible boundary effects in terms of rapid flow along the wall of the experimental column were investigated.

scholarly journals Dipole and Convergent Single-Well Thermal Tracer Tests for Characterizing the Effect of Flow Configuration on Thermal Recovery

Geosciences ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 440 ◽  
Author(s):  
Jérôme de La Bernardie ◽  
Olivier Bour ◽  
Nicolas Guihéneuf ◽  
Eliot Chatton ◽  
Laurent Longuevergne ◽  
...  
Keyword(s):  
Fractured Rock ◽  
Tracer Tests ◽  
Crystalline Rock ◽  
Industrial Applications ◽  
Thermal Recovery ◽  
Geothermal System ◽  
Distributed Temperature Sensing ◽  
Flow Configuration ◽  
Single Well ◽  
Flow Configurations

Experimental characterization of thermal transport in fractured media through thermal tracer tests is crucial for environmental and industrial applications such as the prediction of geothermal system efficiency. However, such experiments have been poorly achieved in fractured rock due to the low permeability and complexity of these media. We have thus little knowledge about the effect of flow configuration on thermal recovery during thermal tracer tests in such systems. We present here the experimental set up and results of several single-well thermal tracer tests for different flow configurations, from fully convergent to perfect dipole, achieved in a fractured crystalline rock aquifer at the experimental site of Plœmeur (H+ observatory network). The monitoring of temperature using Fiber-Optic Distributed Temperature Sensing (FO-DTS) associated with appropriate data processing allowed to properly highlight the heat inflow in the borehole and to estimate temperature breakthroughs for the different tests. Results show that thermal recovery is mainly controlled by advection processes in convergent flow configuration while in perfect dipole flow field, thermal exchanges with the rock matrix are more important, inducing lower thermal recovery.

scholarly journals Elucidation of Flow and Transport Processes in a Variably Saturated System of Interlayered Sediment and Fractured Rock Using Tracer Tests

2007 ◽  
Vol 6 (4) ◽  
pp. 855-867 ◽  
Author(s):  
Catherine L. Duke ◽  
Robert C. Roback ◽  
Paul W. Reimus ◽  
Robert S. Bowman ◽  
Travis L. McLing ◽  
...  
Keyword(s):  
Fractured Rock ◽  
Tracer Tests ◽  
Transport Processes ◽  
Flow And Transport

Field measurement of radial solute transport in fractured rock

1994 ◽  
Vol 30 (1) ◽  
pp. 37-44 ◽  
Author(s):  
K. S. Novakowski ◽  
P. A. Lapcevic
Keyword(s):  
Solute Transport ◽  
Field Measurement ◽  
Fractured Rock
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