Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect
Groundwater evapotranspiration (ETg) is the most important dischargeway of shallow groundwater in arid and semi-arid areas, and also is a significant component of the water budget in groundwater systems. When groundwater levelsare interfered with barometric effect, the traditional water table fluctu...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Hydrogeology & Engineering Geology
2021-03-01
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| Series: | Shuiwen dizhi gongcheng dizhi |
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| Online Access: | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202003069 |
| _version_ | 1811169591345283072 |
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| author | Donghui CHENG Jing YUAN Lijun QI |
| author_facet | Donghui CHENG Jing YUAN Lijun QI |
| author_sort | Donghui CHENG |
| collection | DOAJ |
| description | Groundwater evapotranspiration (ETg) is the most important dischargeway of shallow groundwater in arid and semi-arid areas, and also is a significant component of the water budget in groundwater systems. When groundwater levelsare interfered with barometric effect, the traditional water table fluctuation method for estimation of the ETg rate cannot be directly employed.This paper proposes a hydrographical method for removing the barometric effect on the ETg rateestimation using water-table fluctuations based on the changes ingroundwater levels and barometric pressure.The results illustrate that thechangesin barometric pressure usually reach the peak before midnight, generally between 22:00 and 24:00 when the barometric effect can be ignored, and the evapotranspiration rate is the minimum and therefore thegroundwater level changes rate at this time interval is equivalent to the net recharge rate. Furthermore, the second time period between 0:00 and 4:00 when the ETg rate is negligible and the barometric pressure is generally in a continuous decline, is then selected to estimate the barometric efficiency. On the basis of these analyses, the ETg rate can be readily estimated by the groundwater level balance method and the water table fluctuation method. The data required in theproposed methodare easy to obtain and the estimated ETg ratesare relatively accurate. |
| first_indexed | 2024-04-10T16:44:56Z |
| format | Article |
| id | doaj.art-e7d7c8da520f447d875ae34c539671fe |
| institution | Directory Open Access Journal |
| issn | 1000-3665 |
| language | zho |
| last_indexed | 2024-04-10T16:44:56Z |
| publishDate | 2021-03-01 |
| publisher | Editorial Office of Hydrogeology & Engineering Geology |
| record_format | Article |
| series | Shuiwen dizhi gongcheng dizhi |
| spelling | doaj.art-e7d7c8da520f447d875ae34c539671fe2023-02-08T01:30:07ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652021-03-0148281410.16030/j.cnki.issn.1000-3665.202003069202003069Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effectDonghui CHENG0Jing YUAN1Lijun QI2School of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Water and Environment, Chang’an University, Xi’an, Shaanxi 710054, ChinaInstitute of Earth Environment, Chinese Academy of Sciences, Xi’an, Shaanxi 710054, ChinaGroundwater evapotranspiration (ETg) is the most important dischargeway of shallow groundwater in arid and semi-arid areas, and also is a significant component of the water budget in groundwater systems. When groundwater levelsare interfered with barometric effect, the traditional water table fluctuation method for estimation of the ETg rate cannot be directly employed.This paper proposes a hydrographical method for removing the barometric effect on the ETg rateestimation using water-table fluctuations based on the changes ingroundwater levels and barometric pressure.The results illustrate that thechangesin barometric pressure usually reach the peak before midnight, generally between 22:00 and 24:00 when the barometric effect can be ignored, and the evapotranspiration rate is the minimum and therefore thegroundwater level changes rate at this time interval is equivalent to the net recharge rate. Furthermore, the second time period between 0:00 and 4:00 when the ETg rate is negligible and the barometric pressure is generally in a continuous decline, is then selected to estimate the barometric efficiency. On the basis of these analyses, the ETg rate can be readily estimated by the groundwater level balance method and the water table fluctuation method. The data required in theproposed methodare easy to obtain and the estimated ETg ratesare relatively accurate.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202003069groundwater evapotranspirationbarometric effectwater table fluctuation methodloessphreatic aquifer |
| spellingShingle | Donghui CHENG Jing YUAN Lijun QI Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect Shuiwen dizhi gongcheng dizhi groundwater evapotranspiration barometric effect water table fluctuation method loessphreatic aquifer |
| title | Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect |
| title_full | Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect |
| title_fullStr | Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect |
| title_full_unstemmed | Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect |
| title_short | Estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect |
| title_sort | estimation of groundwater evapotranspiration rate in the loess phreaticaquifer by removing the barometric effect |
| topic | groundwater evapotranspiration barometric effect water table fluctuation method loessphreatic aquifer |
| url | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202003069 |
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