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Theoretical Basis for Describing Thermally Induced Water Flux in Soils

机译：描述土壤热诱导水通量的理论基础

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This paper proposed a theory to address the underestimation of water flux by the model of Philip and de Vries (1957) for conditions without ice lenses. Experiments with a modified capillary rise method were proposed to calculate a gain factor, which accounts for this underestimation. For the thermally induced flux in frozen soils with ice lenses, a theoretical formulation was derived for the segregation potential, which is the key parameter in the model of Konrad and Morgenstera (1982). This theoretical formulation, which is a unique contribution of this paper, is expressed in a simple mathematical form and can be conveniently used for accurate prediction of segregation potential.

机译：本文提出了一种理论，以解决Philip和de Vries（1957）在无冰透镜条件下对水通量的低估问题。提出了使用改进的毛细管上升方法进行的实验来计算增益因子，这可以解释这种低估的原因。对于带有冰晶的冻土中的热感应通量，推导了偏析势的理论公式，这是Konrad和Morgenstera（1982）模型中的关键参数。该理论公式是本文的独特贡献，以简单的数学形式表示，可以方便地用于准确预测偏析潜力。

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《Geo-Congress》|2014年|3487-3495|共9页
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Zhen Liu; Bin Zhang; Xiong Yu;
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1. Theoretical analysis of soil and plant traits influencing daily plant water flux on drying soils [J] . SinclairT.R. Agronomy Journal . 2007,第4期

机译：土壤和植物性状影响干燥土壤日水通量的理论分析
2. Theoretical Analysis of Soil and Plant Traits Influencing Daily Plant Water Flux on Drying Soils [J] . Thomas R. Sinclair Agronomy Journal . 2005,第4期

机译：土壤和植物性状对干旱土壤日水分通量的影响理论分析
3. Influences of thermal dispersion on soil water flux estimates using heat pulse technique in saturated soils [J] . Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution . 2018,第期

机译：饱和土壤热脉冲技术在土壤水通量估计下热分散体的影响
4. Theoretical Basis for Describing Thermally Induced Water Flux in Soils [C] . Zhen Liu, Bin Zhang, Xiong Yu Geo-Congress . 2014

机译：用于描述土壤中热诱导水通量的理论依据
5. Heat pulse measurement techniques for soil water flux, soil water content, and soil volumetric heat capacity. [D] . Ochsner, Tyson Edward. 2003

机译：用于土壤水通量，土壤水分和土壤体积热容的热脉冲测量技术。
6. Lateral transport of soil carbon and land−atmosphere CO2 flux induced by water erosion in China [O] . Yao Yue, Jinren Ni, Philippe Ciais, 2016

机译：中国水蚀引起土壤碳和陆地-大气CO2通量的横向迁移
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

Theoretical Basis for Describing Thermally Induced Water Flux in Soils

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