Implication of density-dependent flow on numerical modelling of SW-GW interactions

Sina Alaghmand, Philip Brunner, Thomas Graf, Craig Simmons

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    With the growing interest in the last decades in the modelling of hydrogeological processes involved in the water resources management, it has been recognized that the assumption of constantproperties water is no longer adequate in the analysis and simulation of the flow considered in these cases. In recent years, many studies used simplistic approaches that may not represent the aquifer flow dynamics realistically by not accounting for changing fluid density. This study explore the importance of understanding the impact of density-dependent flow on SW-GW interactions. To this aim two synthetic models was developed at large and small scales and various scenarios were defined to explore the impact of density-dependent flow on drivers including river and aquifer salinity ratio, hydraulic gradient and river geometry. The results shows that simplifying by excluding density-dependent flow leads to overestimation of solute mass accumulation, and eventually groundwater salinity and limited freshwater lens. Also, the simulated model without density-dependent flow is not able to represent the unsaturated zone properly. However, these impacts are limited to the river banks. In the small scale, when simulated with density-dependent flow, large salinity ratio between river and aquifer can significantly influence both solute and flow dynamics. Moreover, mixed-convention was observed when hydraulic gradient was towards river. Overall, it was concluded that density-dependent flow play an essential role in SW-GW interaction and needs to be taken in to account where the river and aquifer have significant salinity difference, particularly at the vicinity of the river banks.

    Original languageEnglish
    Title of host publication8th International Congress on Environmental Modelling and Software - Toulouse, France - July 2016
    EditorsSabine Simeoni-Sauvage, Jose Miguel Sanchez-Perez, Andrea-Emilio Rizzoli
    PublisherInternational Environmental Modelling and Software Society (iEMSs)
    Pages98-105
    Number of pages8
    ISBN (Electronic)9788890357459
    Publication statusPublished - 2016
    Event8th International Congress on Environmental Modelling and Software - Environmental Modelling and Software for Supporting a Sustainable Future, iEMSs 2016 - Toulouse, France
    Duration: 10 Jul 201614 Jul 2016

    Publication series

    NameEnvironmental Modelling and Software for Supporting a Sustainable Future, Proceedings - 8th International Congress on Environmental Modelling and Software, iEMSs 2016
    Volume1

    Conference

    Conference8th International Congress on Environmental Modelling and Software - Environmental Modelling and Software for Supporting a Sustainable Future, iEMSs 2016
    CountryFrance
    CityToulouse
    Period10/07/1614/07/16

    Keywords

    • Density-dependent flow
    • Numerical modelling
    • SW-GW interaction

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  • Cite this

    Alaghmand, S., Brunner, P., Graf, T., & Simmons, C. (2016). Implication of density-dependent flow on numerical modelling of SW-GW interactions. In S. Simeoni-Sauvage, J. M. Sanchez-Perez, & A-E. Rizzoli (Eds.), 8th International Congress on Environmental Modelling and Software - Toulouse, France - July 2016 (pp. 98-105). (Environmental Modelling and Software for Supporting a Sustainable Future, Proceedings - 8th International Congress on Environmental Modelling and Software, iEMSs 2016; Vol. 1). International Environmental Modelling and Software Society (iEMSs). https://scholarsarchive.byu.edu/iemssconference/2016/Stream-A/95/