期刊
HYDROGEOLOGY JOURNAL
卷 26, 期 5, 页码 1683-1691出版社
SPRINGER
DOI: 10.1007/s10040-018-1751-0
关键词
Water-table depth; Unsaturated zone; Soil processes; Evaporation; China
资金
- National Natural Science Foundation of China [41230314, U1603243]
- Shaanxi Science and Technology Research and Development Project [2014 K1501-02]
- program for Changjiang Scholars and Innovative Research Team of the Chinese Ministry of Education [IRT0811]
- Fundamental Research Funds for the Central Universities [310829175006]
- Chinese Scholarship Council [201606560014]
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.
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