Evaporation from bare soil: Lysimeter experiments in sand dams interpreted using conceptual and numerical models
Evaporation from bare soil: Lysimeter experiments in sand dams interpreted using conceptual and numerical models
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DOI：
10.1016/j.jhydrol.2018.07.011
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发表时间：
2018-09
影响因子：
6.4
通讯作者：
R. Quinn;A. Parker;K. Rushton
中科院分区：
文献类型：
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作者：
R. Quinn;A. Parker;K. Rushton
与开阔水域的蒸发量不同，裸露土壤的蒸发量随着地下水位的下降而减小。裸地蒸发研究包括实地和实验室试验、数学公式和半经验模型。然而，只有有限的现场信息，特别是关于裸砂蒸发的信息。粮农组织灌溉与排水论文56的半经验方法包含了计算作物需水量的指导方针，可以适用于裸土蒸发的三个阶段过程。通过在沙坝中安装溶渗仪，研究了粮农组织第56号方法对裸砂蒸发的适用性。沙坝是一种浅层地下水储存系统，其设计是基于地下水位下降时蒸发减少的假设。基于FAO 56的水平衡模型充分模拟了溶渗仪的现场结果，该模型还增加了一个分量，以表示实际中发生的随深度变化的饱和度之间的差异，以及标准水平衡模型中对地下水位从干燥状态突然变为完全饱和状态的假设。本研究证明并量化了裸露土壤蒸发量相对于开阔水域或种植区的减少，并证实了粮农组织三阶段半经验方法的有效性。
Unlike evaporation from open water, the magnitude of evaporation from bare soil decreases as the water table falls. Bare soil evaporation studies have included field and laboratory experiments, mathematical formulations and semi-empirical models. However, there is only limited field information, especially concerning evaporation from bare sand. The semi-empirical approach of the FAO1Irrigation and Drainage Paper 56, which contains guidelines for computing crop water requirements, can be adapted for bare soil evaporation with a three stage process. The suitability of the FAO 56 approach for bare sand evaporation is investigated by installing lysimeters in sand dams. Sand dams are shallow groundwater storage systems, which are designed on the assumption of reduced evaporation as the water table falls. The field results from the lysimeters are simulated adequately by a water balance model based on FAO 56 with an additional component to represent both the difference between the variable saturation with depth, which occurs in practice, and the assumption in standard water balance models of a sudden change from dry to fully-saturated conditions at the water table. This study demonstrates and quantifies the reduction in bare soil evaporation compared to open water or cropped areas and confirms the validity of the three stage FAO semi-empirical approach.