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Hydrogeology Journal

Erschienen in:

19.03.2018 | Paper

Evaporation from bare ground with different water-table depths based on an in-situ experiment in Ordos Plateau, China

verfasst von: Zaiyong Zhang, Wenke Wang, Zhoufeng Wang, Li Chen, Chengcheng Gong

Erschienen in: Hydrogeology Journal | Ausgabe 5/2018

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Abstract

The dynamic processes of ground evaporation are complex and are related to a multitude of factors such as meteorological influences, water-table depth, and materials in the unsaturated zone. To investigate ground evaporation from a homogeneous unsaturated zone, an in-situ experiment was conducted in Ordos Plateau of China. Two water-table depths were chosen to explore the water movement in the unsaturated zone and ground evaporation. Based on the experimental and calculated results, it was revealed that (1) bare ground evaporation is an atmospheric-limited stage for the case of water-table depth being close to the capillary height; (2) the bare ground evaporation is a water-storage-limited stage for the case of water-table depth being beyond the capillary height; (3) groundwater has little effect on ground-surface evaporation when the water depth is larger than the capillary height; and (4) ground evaporation is greater at nighttime than that during the daytime; and (5) a liquid-vapor interaction zone at nearly 20 cm depth is found, in which there exists a downward vapor flux on sunny days, leading to an increasing trend of soil moisture between 09:00 to 17:00; the maximum value is reached at midday. The results of this investigation are useful to further understand the dynamic processes of ground evaporation in arid areas.

Vorheriger Artikel Assessment of groundwater exploitation in an aquifer using the random walk on grid method: a case study at Ordos, China

Nächster Artikel Estimation of bare soil evaporation for different depths of water table in the wind-blown sand area of the Ordos Basin, China

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Titel: Evaporation from bare ground with different water-table depths based on an in-situ experiment in Ordos Plateau, China
verfasst von: Zaiyong Zhang
Wenke Wang
Zhoufeng Wang
Li Chen
Chengcheng Gong
Publikationsdatum: 19.03.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Hydrogeology Journal / Ausgabe 5/2018
Print ISSN: 1431-2174
Elektronische ISSN: 1435-0157
DOI: https://doi.org/10.1007/s10040-018-1751-0

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