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Estimation of groundwater recharge in a shallow sandy aquifer using unsaturated zone modeling and water table fluctuation method
Abstract
Quantification of groundwater recharge is one of the most important issues in hydrogeology, especially in view of the ongoing changes in climate and land use. In this study, we use numerical models of 1D vertical flow in the vadose zone and the water table fluctuation (WTF) analysis to investigate local-scale recharge of a shallow sandy aquifer in the Brda outwash plain in northern Poland. We show that these two methods can be jointly used to improve confidence in recharge estimation. A set of preliminary numerical simulations based on soil water content measurements from 4 grassland and pine forest profiles provided a wide range of recharge estimates (263 mm to 839 mm for a 3-year period). Additional simulations were performed with the lower boundary condition specified as a functional relationship between the groundwater table elevation and the rate of groundwater outflow from the vertical profile (horizontal drains boundary condition). In this way, we could reproduce the water table fluctuations resulting from recharge and lateral discharge to nearby lakes. The agreement between simulated and observed groundwater levels differed depending on the specific set of parameters characterizing vadose zone flow, which allowed us to find the most representative parameter sets and refine the range of plausible recharge estimates (501 mm to 573 mm per 3 years). The recharge rates from WTF (410 mm to 606 mm per 3 years) were in good agreement with numerical simulations, providing that the effect of the natural recession of groundwater table due to lateral outflow was considered (master recession curve method). Our results show that: (i) the proposed approach combining 1D vadose zone modeling and WTF improves recharge estimation, (ii) multiple types of observations, including groundwater table positions, are needed to calibrate and validate vadose zone flow models, and (iii) extended periods of observations and simulations are necessary to capture year-to-year variability in the recharge rates.
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Authors (7)
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Rafael Angulo-Jaramillo Dr.
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69518, Vaulx-en- Velin, France
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Jirka Šimůnek
- University of California Riverside, CA, USA
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Full text
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jhydrol.2021.127283
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Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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JOURNAL OF HYDROLOGY
no. 605,
ISSN: 0022-1694 - Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- Gumuła-Kawęcka A., Jaworska-Szulc B., Szymkiewicz A., Gorczewska-Langner W., Pruszkowska-Caceres M., Angulo-Jaramillo R., Šimůnek J.: Estimation of groundwater recharge in a shallow sandy aquifer using unsaturated zone modeling and water table fluctuation method// JOURNAL OF HYDROLOGY -Vol. 605, (2022), s.127283-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jhydrol.2021.127283
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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