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Monitoring Soil Water Content by Vertical Temperature Variations

机译:通过垂直温度变化监测土壤水分

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摘要

The availability of high sensitivity temperature sensors (0.001 K sensitivity platinum resistors), which can be positioned at intervals of a few centimeters along a vertical profile in the unsaturated zone, allows short-term in situ determinations-one day or even less-of the thermal diffusivity. The development of high data storage capabilities also makes this possible over long periods and the relative variations in thermal diffusivity allow the monitoring of the variations in water content. The processing of temperature measurements recorded at different depths is achieved by solving the heat equation, using the finite elements method, with both conductive and convective heat transfers. A first set of measurements has allowed this approach to be validated. Water content variations derived from thermal diffusivity values are in excellent agreement with TDR measurements carried out on the experimental site at Boissy-le-Chatel (Seine et Marne, France).
机译:高灵敏度温度传感器(0.001 K灵敏度铂电阻器)的可用性可以沿非饱和区中的垂直剖面以几厘米的间隔放置,从而可以在一天甚至更少的时间内进行短期原位测定。热扩散率。高数据存储能力的发展也使得长期可能实现这一点,并且热扩散率的相对变化允许监控水含量的变化。通过使用传导和对流传热的有限元方法,通过求解热方程,可以实现对不同深度处记录的温度测量值的处理。第一组测量值已验证了此方法。由热扩散率值得出的水含量变化与在Boissy-le-Chatel(Seine et Marne,France)的实验现场进行的TDR测量非常吻合。

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  • 来源
    《Ground water》 |2014年第4期|566-572|共7页
  • 作者单位

    Universite des Sciences et de la Technologie Houari Boumediene, BP 32 El Alia 16111 Bab Ezzouar, Alger, Algeria ,Universite Pierre et Marie Curie-Paris 6 (UPMC)/CNRS, UMR 7619 Sisyphe, case courrier 105, 4 place Jussieu, 75252 Paris cedex 05, France;

    Universite Pierre et Marie Curie-Paris 6 (UPMC)/CNRS, UMR 7619 Sisyphe, case courrier 105, 4 place Jussieu, 75252 Paris cedex 05, France;

    Universite Pierre et Marie Curie-Paris 6 (UPMC)/CNRS, UMR 7619 Sisyphe, case courrier 105, 4 place Jussieu, 75252 Paris cedex 05, France;

    Universite Pierre et Marie Curie-Paris 6 (UPMC)/CNRS, UMR 7619 Sisyphe, case courrier 105, 4 place Jussieu, 75252 Paris cedex 05, France;

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