Non-equilibrium in soil hydraulic modelling

• Verfasst von: Vogel, Hans-Jörg [VerfasserIn]
• Verfasst von: Weller, Ulrich [VerfasserIn]
• Verfasst von: Ippisch, Olaf [VerfasserIn]
• Titel: Non-equilibrium in soil hydraulic modelling
• Verf.angabe: H. -J. Vogel, U. Weller, O. Ippisch
• E-Jahr: 2010
• Jahr: 18 March 2010
• Umfang: 9 S.
• Fussnoten: Gesehen am 12.09.2023
• Titel Quelle: Enthalten in: Journal of hydrology
• Ort Quelle: Amsterdam [u.a.] : Elsevier, 1963
• Jahr Quelle: 2010
• Band/Heft Quelle: 393(2010), 1, Seite 20-28
• ISSN Quelle: 1879-2707
• DOI: doi:10.1016/j.jhydrol.2010.03.018
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Modelling
• Sach-SW: Preferential flow
• Sach-SW: Soil hydraulic properties
• Sach-SW: Soil hydrology
• Sach-SW: Spatial heterogeneity
• Sach-SW: Upscaling
• K10plus-PPN: 1859270638

Abstract

A notorious problem in modelling water dynamics within the unsaturated zone is preferential flow and temporal non-equilibrium between water content and water potential. These phenomena originate from the ubiquitous spatial heterogeneity of soil hydraulic properties and substantially hampers the prediction of solute transport from the soil surface towards groundwater. The characteristic scale of these processes is the soil profile or ‘pedon scale’ where modelling of water dynamics is typically based on the well established Richards equation which has been augmented by various conceptual approaches to represent preferential flow phenomena. In this paper we investigate through numerical case studies hydraulic non-equilibrium during infiltration of water into relatively dry, heterogeneous soil profiles, which is the most prominent scenario where non-equilibrium conditions affect the overall dynamics of water and solutes...