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Published in: Hydrogeology Journal 5/2018

28-04-2018 | Paper

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

Authors: Li Chen, Wenke Wang, Zaiyong Zhang, Zhoufeng Wang, Qiangmin Wang, Ming Zhao, Chengcheng Gong

Published in: Hydrogeology Journal | Issue 5/2018

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Abstract

Soil surface evaporation is a significant component of the hydrological cycle, occurring at the interface between the atmosphere and vadose zone, but it is affected by factors such as groundwater level, soil properties, solar radiation and others. In order to understand the soil evaporation characteristics in arid regions, a field experiment was conducted in the Ordos Basin, central China, and high accuracy sensors of soil moisture, moisture potential and temperature were installed in three field soil profiles with water-table depths (WTDs) of about 0.4, 1.4 and 2.2 m. Soil-surface-evaporation values were estimated by observed data combined with Darcy’s law. Results showed that: (1) soil-surface-evaporation rate is linked to moisture content and it is also affected by air temperature. When there is sufficient moisture in the soil profile, soil evaporation increases with rising air temperature. For a WTD larger than the height of capillary rise, the soil evaporation is related to soil moisture content, and when air temperature is above 25 °C, the soil moisture content reduces quickly and the evaporation rate lowers; (2) phreatic water contributes to soil surface evaporation under conditions in which the WTD is within the capillary fringe. This indicates that phreatic water would not participate in soil evaporation for a WTD larger than the height of capillary rise. This finding developed further the understanding of phreatic evaporation, and this study provides valuable information on recognized soil evaporation processes in the arid environment.

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Metadata
Title
Estimation of bare soil evaporation for different depths of water table in the wind-blown sand area of the Ordos Basin, China
Authors
Li Chen
Wenke Wang
Zaiyong Zhang
Zhoufeng Wang
Qiangmin Wang
Ming Zhao
Chengcheng Gong
Publication date
28-04-2018
Publisher
Springer Berlin Heidelberg
Published in
Hydrogeology Journal / Issue 5/2018
Print ISSN: 1431-2174
Electronic ISSN: 1435-0157
DOI
https://doi.org/10.1007/s10040-018-1774-6

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