本研究旨在驗證電容式土壤含水量感測器於入滲監測中的準確性，並以荷重計量測值作為對照基準。試驗採用垂直土柱進行試驗，土柱表面維持固定水頭3.9 cm，以模擬一維入滲土柱行為。電容式含水量感測器分別安裝距離土表面於33、58及83 cm深度，利用剖面法推估入滲量，而實際入滲量使用荷重計進行量測，兩者感測器同步量測記錄。試驗結果顯示，三次重複試驗中入滲速率皆呈現初期速率較高隨時間趨於穩定，最終入滲速率在2.3×10⁻³ cm/s 至2.4×10⁻³ cm/s。電容式含水量感測器能呈現體積含水量剖面隨深度由上至下逐層反應的現象。在各層電容式含水量感測器體積含水量值達穩定，用該時間推估入滲量，並與該時間荷重計計算之入滲量進行比較，結果顯示電容式含水量感測器誤差為36.8%。整體而言，雖然電容式含水量感測器會有低估入滲量的情形，但其還是可以適切觀察到土壤入滲行為。

This study aims to evaluate the accuracy of capacitive soil moisture sensors in monitoring infiltration, with load cell measurements serving as the reference benchmark. A vertical soil column was used for the infiltration test, during which the soil surface was maintained at a constant ponding head of 3.9 cm to simulate one-dimensional infiltration behavior. Capacitive soil moisture sensors were installed at depths of 33, 58, and 83 cm below the soil surface, and the profile method was employed to estimate infiltration, while actual infiltration was determined from load cell measurements, with both sensors recording data simultaneously. The experimental results showed that in all three replicated tests, infiltration rates initially exhibited relatively high values and gradually approached a steady state, with the final infiltration rate ranging from 2.3 × 10⁻³ cm/s to 2.4 × 10⁻³ cm/s. The capacitive soil moisture sensors successfully captured the sequential wetting response along the soil profile from top to bottom. When the volumetric water content measured by each sensor reached a stable value, the corresponding time was used to estimate the infiltration depth, which was then compared with that derived from load cell measurements; the results indicated that the estimation error of the capacitive sensors was (36.8 %). Overall, although capacitive soil moisture sensors tended to underestimate infiltration amounts, they were still effective in capturing the infiltration process in soils.

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