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A coupled surface/subsurface flow model accounting for air entrapment and air pressure counterflow

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Authors:
  • Delfs, Jens Olaf ;
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    Water and Earth System Science (WESS) Cluster
  • Wang, Wenqing ;
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    Department of Environmental Informatics
  • Kalbacher, Thomas ;
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    Department of Environmental Informatics
  • Singh, Ashok ;
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    Orcid logo0000-0002-1208-5326
    Institute of Technology and Innovation, Faculty of Engineering, SDU
  • Kolditz, Olaf
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    Department of Environmental Informatics
DOI:
10.1007/s12665-013-2420-1
Abstract:
This work introduces the soil air system into integrated hydrology by simulating the flow processes and interactions of surface runoff, soil moisture and air in the shallow subsurface. The numerical model is formulated as a coupled system of partial differential equations for hydrostatic (diffusive wave) shallow flow and two-phase flow in a porous medium. The simultaneous mass transfer between the soil, overland, and atmosphere compartments is achieved by upgrading a fully established leakance concept for overland-soil liquid exchange to an air exchange flux between soil and atmosphere. In a new algorithm, leakances operate as a valve for gas pressure in a liquid-covered porous medium facilitating the simulation of air out-break events through the land surface. General criteria are stated to guarantee stability in a sequential iterative coupling algorithm and, in addition, for leakances to control the mass exchange between compartments. A benchmark test, which is based on a classic experimental data set on infiltration excess (Horton) overland flow, identified a feedback mechanism between surface runoff and soil air pressures. Our study suggests that air compression in soils amplifies surface runoff during high precipitation at specific sites, particularly in near-stream areas.
Type:
Journal article
Language:
English
Published in:
Environmental Earth Sciences, 2013, Vol 69, Issue 2, p. 395-414
Keywords:
Coupled flow; Horton runoff; Leakance; OpenGeoSys (OGS); Soil gas release; Two-phase flow
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2013
Scientific Level:
Scientific
ID:
240977343

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