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| DOI：10.13522/j.cnki.ggps.20180459 |
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| Metrological Factors Affecting Evaporation of Shallow Groundwater in the Absence of Plants in Huaibei Plain |
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LU Xiaoming, YANG Miao, WANG Zhenlong, LYU Haishen, GU Nan
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1. Jiangsu Province Hydrology and Water Resources Investigation Bureau， Nanjing 210029， China;2. Hohai University， Nanjing 211100， China; 3.Water Resources Research Institute of Anhui Province， Bengbu 233000， China
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| Abstract: |
| 【Objective】Groundwater evaporation is a main process in hydrological cycle, and the objective of this paper is to unveil the main metrological factors that profoundly impact shallow groundwater evaporation in the absence of plants. 【Method】The experiment was conducted in 62 lysimeters filled with intact fluvo-aquaic soil and lime concretion black soil respectively. Data measured from 1991 to 2015 were used to analyze groundwater evaporation in response to surface water evaporation, ground-surface temperature and rainfall, from which we identified the most influential factors.【Result】Groundwater evaporation from both soils was proportional to surface water evaporation with R2>0.9, and was closely related to intra-annual temperature fluctuation. For groundwater in the lime concretion black soil, the impact of temperature on its evaporation was significant when groundwater table was shallower than 0.2 m depth and became less noticeable when groundwater table dropped to 0.4 m deep. For fluvo-aquaic soil, the temperature had considerable impact when the depth of groundwater table was above 1.0 m and the impact decreased as groundwater table dropped to 2.0 m deep. From May to August, the evaporation increased with ground-surface temperature, while during the following November to February it decreased as ground-surface temperature increased. March, April, September and October were turning points during which there was no close relationship between ground-surface temperature and groundwater evaporation. Both monthly average groundwater evaporation and ground-surface temperature were normally distributed with R2 being 0.9.【Conclusion】 Groundwater evaporation from the fluvo-aquic soil was affected by meteorological factors more than from the lime concretion black soil, and for both soils it was closely related to the ground-surface temperature. |
| Key words: phreatic evaporation; meteorological factors; soil temperature; bare land; Hubei plain |
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