Papers by Tammo Steenhuis
Transport in Porous Media, 1990
Three-dimensional fingers caused by gravity driven, wetting front instability in unsaturated poro... more Three-dimensional fingers caused by gravity driven, wetting front instability in unsaturated porous media were explored through laboratory experimentation. Two sets of experiments were conducted using initially dry sand in large 30 cm diameter columns to guide analytical development for finger velocity and diameter. The first set consisted of ponding water on a two-layer sand system with a fine sand overlying a coarse sand. Here, a complicated pattern of interaction among fingers was found to occur. In the second set, water was applied directly to the coarse layer as 2 cm diameter area sources, enabling systematic study of individual finger structure. Based on dimensional analysis and the experimental results, general relationships were found for finger velocity and cross-sectional area as a function of both the flux through the finger and hydraulic properties of the coarse layer represented by the sorptivity, saturated conductivity, and initial and saturated moisture contents. Unlike the two-dimensional case, air entrapment was an important factor in explaining the experimental results.
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Soil Science Society of America Journal, 1998
... Tim WJ Bauters, David A. DiCarlo, Tammo S. Steenhuis,* and Jean-Yves Parlange ... where: d = ... more ... Tim WJ Bauters, David A. DiCarlo, Tammo S. Steenhuis,* and Jean-Yves Parlange ... where: d = finger width, cm 6f = moisture content at finger tip, cm3 cm~3 T| = exponent in the Brooks andCorey (1964) conductivity equation; for sand, the exponent varies between 3.3 and 3.7 ...
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Journal of Irrigation and Drainage Engineering-asce, 1990
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Keyword: Agriculture, hydrologically sensitive areas (HSA), manure spreading, risk assessment, ru... more Keyword: Agriculture, hydrologically sensitive areas (HSA), manure spreading, risk assessment, run08 saturation excess, Soil Moisture Routing Model (SMR), variable source areas, watershed, water quality ... M. To& Walter is mistant professor in the &part-ment of ...
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Water Resources Research, 1998
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Water Resources Research, 1991
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Journal of Environmental Quality, 1994
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Water Resources Research, 1993
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Water Resources Research, 1989
ABSTRACT
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Journal of Contaminant Hydrology, 1998
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Ecological Engineering, 1995
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Water Resources Research, 1999
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Soil Science Society of America Journal, 1993
Page 1. 934 SOIL SCI. SOC. AM. J., VOL. 57, JULY-AUGUST 1993 NONINVASIVE TIME DOMAIN REFLECTOMETR... more Page 1. 934 SOIL SCI. SOC. AM. J., VOL. 57, JULY-AUGUST 1993 NONINVASIVE TIME DOMAIN REFLECTOMETRY MOISTURE MEASUREMENT PROBE JOHN S. SELKER,* LYNETTE GRAFF, AND TAMMO STEENHUIS ...
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Soil Science, 1989
Page 1. 0038-075X/89/1481-0060$02.00/0 Soil Science Copyright <S> 1989 by Williams & Wi... more Page 1. 0038-075X/89/1481-0060$02.00/0 Soil Science Copyright <S> 1989 by Williams & Wilkins July 1989 Vol. 148, No. 1 Printed in USA MECHANISM FOR FINGER PERSISTENCE IN HOMOGENEOUS, UNSATURATED ...
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Water Resources Research, 1989
ABSTRACT
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Water Resources Research, 1994
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Soil Science Society of America Journal, 1993
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Papers by Tammo Steenhuis