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Simulations of freshwater lens recharge and salt/freshwater interfaces using the HYDRUS and SWI2 packages for MODFLOW
Abstract
The paper presents an evaluation of the combined use of the HYDRUS and SWI2 packages for MODFLOW as a potential tool for modeling recharge in coastal aquife rs subject to saltwater intrusion. The HYDRUS package for MODFLOW solves numerically the one-dimensional form of the Richards equation describing water flow in variably- saturated media. The code computes groundwater recharge to or capillary rise from the groundwater table while considering weather, vegetation, and soil hydraulic property data. The SWI2 package represents in a simplified way variable-density flow associated with saltwater intrusion in coastal aquifers. Combining these two packages within the MODFLOW framework provides a more accurate description of vadose zone processes in subsurface systems with shallow aquifers, which strongly depend upon infiltration. The two packages were applied to a two-dimensional problem of recharge of a freshwater lens in a sandy peninsula, which is a typical geomorphologic form along the Baltic and the North Sea coasts, among other places. Results highlighted the sensitivity of calculated recharge rates to the temporal resolution of weather data. Using daily values of precipi tation and potential evapotranspiration produced average recharge rates more than 20% larger than those obtained with weekly or monthly averaged weather data, leading to different trends in the evolution of freshwater-saltwater interfaces. Root water uptake significantly influenced both the recharge rate and the position of the freshwater-saltwater interface. The results were less sensitive to changes in soil hydraulic parameters, which in our study were found to affect average yearly recharge rates by up to 13%.
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Authors (10)
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Jirka Simunek Professor
- University of California Riverside
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Bertrand Leterme PhD
- Engineered and Geosystems Analysis, Instit ute for Environment, Health and Safety, Belgian Nuclear Research Centre
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Sahila Beegum
- University of California Riverside
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Rafael Angulo-Jaramillo Dr.
- Laboratoire d'Ecologie des Hydros ystèmes Naturels et Anthropisés (LEHNA)
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Diederik Jacques Dr. ir.
- Engineered and Geosystems Analysis, Instit ute for Environment, Health and Safety, Belgian Nuclear Research Centre
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.2478/johh-2018-0005
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Keywords
Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
Journal of Hydrology and Hydromechanics
no. 66,
pages 246 - 256,
ISSN: 0042-790X - Language:
- English
- Publication year:
- 2018
- Bibliographic description:
- Szymkiewicz A., Gumuła-Kawęcka A., Simunek J., Leterme B., Beegum S., Jaworska-Szulc B., Pruszkowska-Caceres M., Gorczewska-Langner W., Angulo-Jaramillo R., Jacques D.: Simulations of freshwater lens recharge and salt/freshwater interfaces using the HYDRUS and SWI2 packages for MODFLOW// Journal of Hydrology and Hydromechanics. -Vol. 66, nr. 2 (2018), s.246-256
- DOI:
- Digital Object Identifier (open in new tab) 10.2478/johh-2018-0005
- Verified by:
- Gdańsk University of Technology
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