NDLI: Temperature dependence of large-scale water-retention curves: a case study

Content Provider	Springer Nature Link
Author	Liu, Hui Hai Bodvarsson, G. S. Dane, J. H.
Copyright Year	2006
Abstract	A local-scale model for temperature-dependence of water-retention curves may be applicable to large scales. Consideration of this temperature dependence is important for modeling unsaturated flow and transport in the subsurface in numerous cases. Although significant progress has been made in understanding and modeling this temperature effect, almost all the previous studies have been limited to small scales (on the order of several centimeters). Numerical experiments were used to investigate the possibility of extending a local-scale model for the temperature-dependence of water retention curves to large scales (on the order of meters). Temperature effects on large-scale hydraulic properties are of interest in many practical applications. Numerical experiment results indicate that the local-scale model can indeed be applicable to large-scale problems for special porous media with high air entry values. A typical porous medium of this kind is the porous tuff matrix in the unsaturated zone of Yucca Mountain, Nevada, the proposed geologic disposal site for national high-level nuclear wastes. Whether this finding can approximately hold for general cases needs to be investigated in future studies.Un modèle à l’échelle locale pour la dépendance à la température des courbes de rétention de l’eau, pourrait être appliqué à de grandes échelles. Dans de nombreux cas cette dépendance est un facteur considérable de la modélisation des écoulements en milieux non--saturés et le transport en sub-surface. Bien que des progrès significatifs ont été réalisés pour comprendre et modéliser l’effet de la température, la plus part des études existantes se sont limitées aux petites échelles (quelques centimètres). L’expérimentation numérique a été utilisée pour étudier la possibilité d’étendre un modèle local à une échelle pluri-métrique. L’effet de la température sur les propriétés hydrauliques est non négligeable dans plusieurs cas. Les résultats des tests numériques indiquent que les modèles sur les petites échelles pourraient être appliqués à des échelles plus grandes, dés lors que le milieu poreux serait caractérisé par une importante pression de l’air à l’entrée. Un milieu poreux typique de cette sorte est le tuf à matrice poreuse de la zone non-saturée dans le Yucca Mountain, Nevada, un site géologique proposé pour le stockage des déchets nucléaires hautement radioactifs. L’application de ces résultats à d’autres cas devrait être étudiée dans de futures études.Un modelo en pequeña escala para la dependencia de temperatura que muestran las curvas de retención de agua puede ser aplicable a escalas grandes. La consideración de la dependencia de la temperatura es importante en muchos casos para el modelizado de transporte y flujo no saturado en el subsuelo. Aunque se ha logrado un avance significativo en el entendimiento y modelizado del efecto de la temperatura, casi todos los estudios previos se han limitado a escalas pequeñas (en el orden de varios centímetros). En este estudio se utilizaron experimentos numéricos para investigar la posibilidad de extender un modelo de escala pequeña para la dependencia de temperatura de las curvas de retención de agua a escalas mayores (en el orden de metros). Los efectos de la temperatura en las propiedades hidráulicas a gran escala son de interés en muchas aplicaciones prácticas. Los resultados de los experimentos numéricos indican que los modelos de escala pequeña pueden efectivamente ser aplicables a problemas en gran escala en medios porosos especiales con altos valores de entrada de aire. Un medio poroso típico de esta clase lo constituye la toba porosa intersticial en la zona no saturada de la Montaña Yuca, Nevada, el sitio geológico propuesto para el depósito nacional de residuos nucleares de alto nivel. Es necesario investigar con estudios futuros si los resultados de esta investigación pueden ser válidos para otros casos generales.
Starting Page	1403
Ending Page	1408
Page Count	6
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	14
Issue Number	8
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-20
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Unsaturated zone Thermal conditions Scale effects General hydrogeology Yucca Mountain Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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