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Southern Great Plains 1997 hydrology experiment: The spatial and temporal distribution of soil moisture within a quarter section pasture fieldUnderstanding the spatial and temporal distribution of soil moisture near the soil surface is important to relate ground truth data to remotely sensed data using an electronically scanned thinned array radiometer (ESTAR). The research was conducted at the A-ARM EF site in the Little Washita Watershed in Chickasha Oklahoma. Soil moisture was measured on a 100 x 100-m grid on a quarter section (0.8 km by 0.8 km) size field where the DOE A-ARM SWATS is located. This site has several drainage channels and small ponds. The site is under four different land use practices, namely active pastureland, non-grazed pastureland covered with thick grass, forest area covered with trees, and a single residential area. Soil moisture was measured with a Time Domain Reflectometry (TDR) Delta-T 6-cm theta-probe and gravimetric soil moisture (GSM) technique for the top 6 cm of the soil depth. A fourth order polynomial equation was fitted to each probe calibration curve. The correlation between TDR and GSM measurement technique ranges from 0.81 to 0.91. Comparison of the spatial and temporal distribution of soil moisture measured by the TDR and GSM techniques showed very strong similarities. Such TDR probes can be used successfully to replace the GSM techniques to measure soil moisture content rapidly and accurately with site specific calibration.
Document ID
20000032225
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Tsegaye, T.
(Alabama A & M Univ. Normal, AL United States)
Coleman, T.
(Alabama A & M Univ. Normal, AL United States)
Tadesse, W.
(Alabama A & M Univ. Normal, AL United States)
Rajbhandari, N.
(Alabama A & M Univ. Normal, AL United States)
Senwo, Z.
(Alabama A & M Univ. Normal, AL United States)
Crosson, W.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Surrency, J.
(Alabama A & M Univ. Normal, AL United States)
Date Acquired
August 19, 2013
Publication Date
February 22, 1998
Publication Information
Publication: NASA University Research Centers Technical Advances in Aeronautics, Space Sciences and Technology, Earth Systems Sciences, Global Hydrology, and Education
Volume: 2 and 3
Subject Category
Earth Resources And Remote Sensing
Funding Number(s)
CONTRACT_GRANT: NCC8-140
CONTRACT_GRANT: NCCW-84
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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