Installation and simple correction method for a profile probe “Drill & Drop Probe”

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  • プロファイルプローブ Drill & Drop Probe の埋設方法と簡易補正の検討
  • プロファイルプローブ Drill & Drop Probe ノ マイセツ ホウホウ ト カンイ ホセイ ノ ケントウ

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The Drill & Drop Probe (DDP) newly devel-oped by Sentek Pty. Ltd. is easy to install directly into a soil without using an access tube because the tapered probe matches auger well. The DDP is suited to situations where a monitoring probe may need to be moved in short term. In this study, a 120 cm length DDP was installed in a loamy field to confirm the installation procedures and propose a simple in-situ correction method for the volumetric water content, θ, measurement. Excavating a smaller diameter hole before using a tapered auger could reduce gaps be-tween the probe and surrounding soil. The DDP overes-timated θ by about 0.057 m3 m−3 relative to gravimetri-cally determined θ at the end of measurements for θ rang-ing from 0.26 to 0.37 m3 m−3. Subtracting the averaged error for stable eight data in ten measurements from the DDP measured value could improve the θ measurement. Since the observed frequency is normalized using air and water frequencies to minimize the sensor difference, this simple correction method can improve the θ measurement for a uniform textured soil. Judging from the continuous monitoring data, there were two types of erroneous mea-surements depending on the connection between the probe and soil: stable but constant error and fluctuating error. It would be possible to interpolate these data using adja-cent data sets in case of the DDP measurement at multiple depths in a soil profile.

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