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  • Other Sources  (2)
  • 1980-1984  (2)
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  • 1
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    Microwave bistatic reflectivity dependence on the moisture content and matric potential of bare soil (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results are presented of an experimental program to determine the functional dependence of the microwave reflectivity of nonvegetated soil surfaces upon volumetric soil moisture and matric potential. A combination evaporation-drainage field experiment was conducted on a bare Captina slit loam with reflectivity, soil moisture content, and matric potential monitored for extended time periods. Results show that for a restricted pressure range (approximately -0.05 to -0.75 bar) there is excellent linear correlation between the log of bistatic reflectivity and both volumetric moisture content and matric potential. Layering effects due to steep moisture content (and matric potential) gradients in the profile are demonstrated to have two distinct and significant effects on the reflectivity response. At near saturation of rough surfaces a very thin dry surface layer appears to modify the effective roughness. This leads to a saturation of reflectivity at high moisture contents. As the surface proceeds to dry further, deeper layers produce coherent interference patterns in the reflectivity response, particularly at the higher frequencies.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-22; 394-405
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Data documentation for the bare soil experiment at the University of Arkansas (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The reflectivities of several controlled moisture test plots were investigated. These test plots were of a similar soil texture which was clay loam and were prepared to give a desired initial soil moisture and density profile. Measurements were conducted on the plots as the soil water redistributed for both long term and diurnal cycles. These measurements included reflectivity, gravimetric and volumetric soil moisture, soil moisture potential, and soil temperature.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10392 , NASA-CR-171626 , SM-AO-04008 , NAS 1.26:171626
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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