Passive microwave observation of soil water infiltration

Thomas J. Jackson, Thomas J. Schmugge, Walter J. Rawls, Peggy E. O'Neill, Marc B. Parlange

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Infiltration 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.

Original languageEnglish
Title of host publication1997 IEEE International Geoscience and Remote Sensing Symposium
Subtitle of host publicationRemote Sensing - A Scientific Vision for Sustainable Development
EditorsTammy I. Stein
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages3
Publication statusPublished - 1997
Externally publishedYes
EventIEEE International Geoscience and Remote Sensing Symposium 1997 - Singapore International Convention and Exhibition Centre, Singapore, Singapore
Duration: 3 Aug 19978 Aug 1997


ConferenceIEEE International Geoscience and Remote Sensing Symposium 1997
Abbreviated titleIGARSS 1997
Internet address

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