Implication of river bed hydrogeological properties in surface water and groundwater interactions: a case study in South Australia

Sina Alaghmand, Simon Beecham, Ali Hassanli

    Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

    Abstract

    Although, SW and GW are hydraulically interconnected, they are often considered as two separate systems and are consequently analyzed independently. A number of versatile and powerful physically-based numerical models have been developed to describe SW-GW flows and solute interactions in a fully-integrated manner. However, characterization of the SW-GW system is complex because of the nature of the processes involved, and the uncertainty of land cover and aquifer properties. The uncertainty is even more profound at or near any river beds. This paper aims to quantify the influence of hydrogeological properties of the model including hydraulic conductivity, porosity and clogging layer thickness on flow dynamics and solute transport between a river and a saline shallow groundwater aquifer. This study is one of the first attempts to investigate the impacts of such geological properties using a 3D physically-based fully integrated numerical model, HydroGeoSphere, driven by observed field data. Clark’s Floodplain, located on the Lower Murray River in South Australia was selected as the study site. The results show that the hydrogeological properties can significantly control the SW-GW interactions including flow dynamic and solute transport in the adjacent floodplain aquifer. For instance, it appears that thicker clogging layer can accelerate the salinization due to lower groundwater level, lower bank storage rate higher ET rate. Also, it was shown that clogging layer thickness can influence the bank storage only during high river flows. Overall, it is demonstrated that proper understanding of the model properties is an essential step to generate effective numerical models that can be used by water managers. In fact, this can be part of an uncertainty reduction process that is very worthwhile since worldwide there is significant investment in water resource projects. In addition, this can significantly speed up the calibration and validation processes.
    Original languageEnglish
    Title of host publicationProceedings of the 36th IAHR World Congress
    Subtitle of host publicationDeltas of the Future and what Happens Upstream
    EditorsArthur Mynett
    Place of PublicationMadrid, Spain
    PublisherInternational Association for Hydro-Environment Engineering and Research (IAHR)
    Number of pages10
    ISBN (Print)9789082484601
    Publication statusPublished - 2015
    EventCongress of IAHR, the International Association of Hydro-Environment Engineering and Research 2015 - The Hague, Netherlands
    Duration: 28 Jun 20153 Jul 2015
    Conference number: 36th

    Conference

    ConferenceCongress of IAHR, the International Association of Hydro-Environment Engineering and Research 2015
    CountryNetherlands
    CityThe Hague
    Period28/06/153/07/15

    Cite this