Laboratory Calibration of Capacitance-Based Soil Moisture Sensor to Monitor Subsurface Soil Moisture Movement in Laterite Soil
Laboratory Calibration of Capacitance-Based Soil Moisture Sensor to Monitor Subsurface Soil Moisture Movement in Laterite Soil
复制标题
用于监测红土土壤地下土壤水分运动的电容式土壤湿度传感器的实验室校准
DOI：
10.9734/ijpss/2021/v33i1730558
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
K. K. Sathian
中科院分区：
文献类型：
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作者：
J. Narayanan;K. K. Sathian
非饱和带地下水水分运动对地下水补给起着至关重要的作用。这种理解对于红土和紫苏花岗岩基岩系统的地形至关重要。传统的地下土壤水分及其运动的测定技术由于成本高、耗时长、野外工作繁重和人为误差的可能性较大而繁琐。在测量体积含水量的许多其他现代技术中，电容式水分传感器功能强大且价格低廉，因此非常适合全球研究学者。该研究涉及使用TEROS 12湿度传感器。基于电容的传感器TEROS 12配备了先进的土壤水分技术，减少了土壤水分评估传统技术的限制，如果针对特定土壤进行适当校准，可以提供精确的测量。该研究涉及对TEROS 12湿度传感器进行土壤特定校准，该校准是针对红土土壤进行的，以将传感器与自动土壤湿度监测系统相结合。通过将TEROS 12传感器的水分测量结果与重量法进行比较，评估了其可靠性。对三个TEROS 12湿度传感器进行了校准，以监测包气带中三个不同土壤深度处的相互流动。在0-0.4 m和0.8-1.2 m深度对传感器进行校准得到的R2值分别为0.996、0.994和0.992。此外，在验证过程中发现，与未经校准的水分含量值相比，新的测量结果在更大程度上与重量测量结果相协调，并提高了精确度，从而使TEROS 12电容式传感器成为可靠和具有成本效益的水分传感器。
Subsurface soil moisture movement in the unsaturated zone plays a critical role in the replenishment of groundwater table. This comprehension can be vital for the terrain with lateritic soil followed by the charnockite bedrock system. The conventional techniques to determine the subsurface soil moisture and its movement is cumbersome owing to high cost, large scale time consumption, field drudgery and greater possibility of manual errors. Among many other modern technologies for the measurement of volumetric water content, capacitance-based moisture sensors are capable and less expensive, thus, making them highly suitable for the research scholars worldwide. The study involves the use of TEROS 12 moisture sensors. The capacitance-based sensor TEROS 12, equipped with advanced soil moisture technique curtails the constraints in the conventional technique of soil moisture assessment and can provide precise measurements if suitably calibrated for the site specific soils. The study involves a soil specific calibration of TEROS 12 moisture sensor which was performed for the laterite soil to incorporate the sensor with the automated soil moisture monitoring system. The reliability of the sensor TEROS 12 was assessed by comparing its moisture measurements with that of the gravimetric method. The calibration was performed for three TEROS 12 moisture sensors in order to monitor the interflow at three varying soil depths in the vadose zone. The R2 values obtained from the calibration of sensors at depths of 0-0.4 m, and 0.8-1.2 m were 0.996, 0.994 and 0.992 respectively. Further, during validation it was found that the new measurements coordinated with the gravimetric measurements to a greater extent and increased the preciseness as compared to that of uncalibrated values of moisture contents, thereby establishing TEROS 12 capacitance-based sensor as a reliable and cost effective moisture sensor.