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首页> 外文期刊>Soil Science Society of America Journal >Correcting Wall Flow Effect Improves the Heat-Pulse Technique for Determining Water Flux in Saturated Soils
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Correcting Wall Flow Effect Improves the Heat-Pulse Technique for Determining Water Flux in Saturated Soils

机译：校正壁流效应改善了确定饱和土壤中水通量的热脉冲技术

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摘要

Heat-pulse sensors are promising tools that can provide rapid measurements of soil water fluxes. The main objective of this study was to determine whether wall flow could be a main reason for discrepancies between measured and heat-pulse water flux densities. Heat-pulse measurements were obtained with a range of water flux densities imposed on packed soil columns of three saturated media: glass beads, a sandy loam soil, and a sandy clay loam soil. Water flux density was calculated from the thermal properties of the media and the ratio of temperature changes at downstream and upstream positions. A novel finding from this study was that in packed columns, wall flow was responsible for the deviations between water flux estimates from heat-pulse data and water flux measured from outflow, and the magnitude of wall flow was largely determined by soil texture. An amplification factor, 1.12 for the sandy loam and 1.24 for the sandy clay loam, was introduced to correct the influence of wall flow, which reduced the errors of the heat-pulse measurements to within 5%. We demonstrated that wall flow was able to explain quantitatively the "reduced convection" theory proposed by earlier researchers. Under the experimental conditions, heat transfer by dispersion was of minor importance.
机译：热脉冲传感器是有前途的工具，可以提供对土壤水通量的快速 测量。这项研究的主要目的是确定壁流是否可能是导致测量的和热脉冲水通量密度之间差异的主要原因 。热脉冲测量是在三种 饱和介质（玻璃珠，砂壤土和砂质）的填充土壤柱上施加一定范围的水通量密度的 来获得的。 > 粘土壤土。根据介质的热学性质和下游和上游位置的温度变化比率计算水通量密度。这项 研究的新发现是，在填充柱中，壁流负责 根据热脉冲 数据估算的水通量与根据流出量测得的水通量和壁流的大小 在很大程度上取决于土壤质地。为了修正壁流的影响，引入了一个放大 因子，沙壤土为1.12，沙质粘土 土为1.24，以减小壁流的影响，从而减小了热脉冲测量的误差在 5％之内。我们证明了壁流能够定量地解释早期研究者提出的“对流减少”理论。 在实验条件下，通过分散进行的传热 次要重要性。

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  • 来源
    《Soil Science Society of America Journal》 |2006年第3期|711-717|共7页
  • 作者

    Jianying Gao; Tusheng Ren; Yuanshi Gong;

  • 作者单位

    College of Resource and Environmental Sciences, China Agricultural Univ., Beijing, China 100094;

    College of Resource and Environmental Sciences, China Agricultural Univ., Beijing, China 100094;

    College of Resource and Environmental Sciences, China Agricultural Univ., Beijing, China 100094;

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