Pore structure and falling rate stage of evaporation in homogeneous sandy soil profiles
Pore structure and falling rate stage of evaporation in homogeneous sandy soil profiles
复制标题
均质沙土剖面孔隙结构及蒸发下降速率阶段
DOI：
10.1016/j.sandf.2022.101108
复制
发表时间：
2022
影响因子：
3.7
通讯作者：
Abdelhadi Monther
中科院分区：
文献类型：
--
作者：
Hussary Jumana;Alowaisy Adel;Yasufuku Noriyuki;Ishikura Ryohei;Abdelhadi Monther
最近，气候变化导致旱地严重干旱和缺水。正确了解土壤表面-大气边界通量对于解决这类环境问题至关重要。在这些地区，蒸发被认为是主要的通量。它分为三个阶段，遵循不同的机制，并高度依赖于土壤性质。现有的研究大多是从宏观角度研究蒸发过程，根据大气条件估算蒸发速率，而考虑土壤性质的研究较少。本文研究了土壤孔隙结构对实际蒸发和非饱和层形成的影响。在统一的低大气需求条件下，进行了均匀干燥砂土柱试验。通过改变织构和相对密度来研究孔隙结构。强调了第二阶段在蒸发过程中的重要性。第二阶段以蒸汽扩散为主，实际蒸发减少速率取决于汽化面后退速率。最后，提出了一个全面、稳健且易于确定的指标，该指标与阶段1和阶段2的持续时间和蒸发水分有很好的相关性。发现孔隙尺寸分布指数（IPSD）反映了孔隙结构的变化，并考虑了毛细管和扩散流动机制。它是评估蒸发过程中实际蒸发和干燥锋深度的基本步骤。
Recently, climate change has been causing severe droughts and water scarcity in drylands. A proper understanding of the soil surface-atmosphere boundary fluxes is essential to combatting such environmental problems. In those regions, evaporation is considered to be the dominant flux. It is divided into three stages that follow different mechanisms and are highly dependent on the soil properties. Most of the existing studies focus on the evaporation process from a macroscale perspective and estimate the evaporation rate based on the atmospheric conditions, while only a few of them consider the soil properties. This paper studied the influence of the soil pore structure on the actual evaporation and formation of the unsaturated layer. Homogeneous drying sandy soil column tests were conducted under a unified low atmospheric demand. The pore structure was investigated by varying the texture and relative density. The significance of Stage 2 in the evaporation process was asserted. Additionally, it was affirmed that vapor diffusion is dominant during Stage 2, where the actual evaporation reduction rate depends on the receding rate of the vaporization plane. Finally, a comprehensive, robust, and easily determined index, that correlates well with the duration and evaporated water during Stage 1 and Stage 2, was proposed. The Pore Size Distribution Index (IPSD) was found to reflect the variations in the pore structure and to consider the capillary and diffusion flow mechanisms. It serves as a fundamental step towards evaluating the actual evaporation and drying front depth during the evaporation process.
登录
查看更多内容
DOI：
--
发表时间：
2011
期刊：
--
影响因子：
--
作者：
M. Fredlund;J. M. Zhang
通讯作者：
J. M. Zhang
新型连续加压法原状土水特性曲线快速测量系统
影响因子：
--
作者：
Adel Alowaisy;N. Yasufuku;R. Ishikura;M. Hatakeyama;Shuu Kyono
通讯作者：
Shuu Kyono
双层沙土剖面第二阶段蒸发及水分再分配特征
DOI：
--
发表时间：
2018
期刊：
--
影响因子：
--
作者：
Adel Alowaisy;N. Yasufuku
通讯作者：
N. Yasufuku
影响因子：
5.4
作者：
K. Heck;E. Coltman;J. Schneider;R. Helmig
通讯作者：
R. Helmig
DOI：
10.1175/1520-0469(1957)014
发表时间：
1957-01-01
期刊：
JOURNAL OF METEOROLOGY
影响因子：
--
作者：
PHILIP, JR
通讯作者：
PHILIP, JR