Dynamics of soil water evaporation during soil drying: laboratory experiment and numerical analysis.
Dynamics of soil water evaporation during soil drying: laboratory experiment and numerical analysis.
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DOI：
10.1155/2013/240280
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发表时间：
2013
影响因子：
--
通讯作者：
Zhou Z
中科院分区：
文献类型：
--
作者：
Han J;Zhou Z
进行了实验室和数值实验，以研究连续干燥事件期间土壤水分蒸发的演变。校准模型模拟的土壤含水量和温度很好地再现了不同深度的测量值。结果表明，蒸发干燥过程可分为三个阶段，从第一阶段相对较高的蒸发速率开始，然后是瞬态阶段和第二阶段较低的速率，最后在第三阶段保持非常低且恒定的速率。在剖面上，冷凝区位于蒸发区的正下方。蒸发和冷凝速率的峰值在阶段1和过渡阶段迅速增加，在阶段2减小，在阶段3保持恒定。蒸发区宽度在阶段1和阶段2持续增加，在阶段3保持恒定值0.68cm。当蒸发区完全移入地下时，在阶段2结束时在蒸发区上方形成干燥表面层(DSL)。DSL宽度在阶段2也呈现连续增加并保持在0.68cm的恒定值。第 3 阶段的恒定值为 0.71 cm。
Laboratory and numerical experiments were conducted to investigate the evolution of soil water evaporation during a continuous drying event. Simulated soil water contents and temperatures by the calibrated model well reproduced measured values at different depths. Results show that the evaporative drying process could be divided into three stages, beginning with a relatively high evaporation rate during stage 1, followed by a lower rate during transient stage and stage 2, and finally maintaining a very low and constant rate during stage 3. The condensation zone was located immediately below the evaporation zone in the profile. Both peaks of evaporation and condensation rate increased rapidly during stage 1 and transition stage, decreased during stage 2, and maintained constant during stage 3. The width of evaporation zone kept a continuous increase during stages 1 and 2 and maintained a nearly constant value of 0.68 cm during stage 3. When the evaporation zone totally moved into the subsurface, a dry surface layer (DSL) formed above the evaporation zone at the end of stage 2. The width of DSL also presented a continuous increase during stage 2 and kept a constant value of 0.71 cm during stage 3.