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• W2156988484 abstract "Direct ground wave (DGW) measurements obtained with ground‐penetrating radar have been used in a number of previous studies to estimate volumetric water content in the shallow soil zone; however, these studies have generally involved controlled field experiments or measurements collected across limited natural ranges of soil moisture conditions. To further investigate the capacity of this method, we have undertaken an extensive field study using multifrequency (i.e., 225, 450, and 900 MHz) DGW measurements to monitor a complete annual cycle of soil water content variations typical of midlatitude climates at three sites with different soil textures. The use of common‐midpoint surveys allowed us to understand the nature and evolution of the near‐surface electromagnetic wavefields and their impact on DGW moisture predictions. We present the novel characterization of a wide‐range of seasonal moisture dynamics including soil freezing and thawing process using multifrequency DGW measurements for a range of soil textures. These data showed significant temporal variations in both the near‐surface wavefield and multifrequency DGW velocities corresponding to both seasonal and shorter‐term variations in soil conditions. Although all of the measurement sites displayed similar temporal responses, the rate and magnitude of these velocity variations corresponded to varying soil water contents, which were controlled by the soil textural properties. Although there were no observed systematic differences in DGW velocities due to frequency dispersion for the 225–900 MHz range, the DGW measurements obtained using higher‐frequency antennas was less impacted by near‐surface wavefield interference due to their shorter signal pulse duration. DGW velocity measurements combined with an appropriate dielectric mixing formula provided quantitative predictions of soil water content that accurately replicated the soil sample data over the annual cycle of moisture conditions." @default.
• W2156988484 created "2016-06-24" @default.
• W2156988484 creator A5061955333 @default.
• W2156988484 creator A5089396189 @default.
• W2156988484 date "2010-11-01" @default.
• W2156988484 modified "2023-09-25" @default.
• W2156988484 title "An examination of direct ground wave soil moisture monitoring over an annual cycle of soil conditions" @default.
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• W2156988484 doi "https://doi.org/10.1029/2009wr008815" @default.
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