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passive microwave observation of soil water infiltrationInfiltration is a time varying process of water entry into soil. Experiments were conducted here using truck based microwave radiometers to observe small plots during and following sprinkler irrigation. Experiments were conducted on a sandy loam soil in 1994 and a silt loam in 1995. Sandy loam soils typically have higher infiltration capabilities than clays. For the sandy loam the observed brightness temperature (TB) quickly reached a nominally constant value during irrigation. When the irrigation was stopped the TB began to increase as drainage took place. The irrigation rates in 1995 with the silt loam soil exceeded the saturated conductivity of the soil. During irrigation the TB values exhibited a pattern that suggests the occurrence of coherent reflection, a rarely observed phenomena under natural conditions. These results suggested the existence of a sharp dielectric boundary (wet over dry soil) that was increasing in depth with time.
Document ID
Document Type
Reprint (Version printed in journal)
Jackson, Thomas J.
(Department of Agriculture Beltsville, MD United States)
Schmugge, Thomas J.
(Department of Agriculture Beltsville, MD United States)
Rawls, Walter J.
(Department of Agriculture Beltsville, MD United States)
ONeill, Peggy E.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Parlange, Marc B.
(Johns Hopkins Univ. Baltimore, MD United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Laboratory for Hydrospheric Processes Research Publications
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
Meeting Information
Geoscience and Remote Sensing(Singapore)
Distribution Limits