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Technische Universität Berlin (2021)

High-resolution integral modelling approach for flow and transport in groundwater-surface water interaction space

Broecker, Katrin Tabea Christina

Titre : High-resolution integral modelling approach for flow and transport in groundwater-surface water interaction space

Hochaufgelöster integraler Modellierungsansatz für Strömung und Transport im Grundwasser-Oberflächenwasser-Interaktionsraum

Auteur : Broecker, Katrin Tabea Christina

Université de soutenance : Technische Universität Berlin

Grade : Doktorin der Ingenieurwissenschaften - Dr.-Ing. - 2021

Résumé partiel
While former research studies mainly considered groundwater and surface water separately, the importance of their interactions is nowadays widely acknowledged. Especially the hyporheic zone, which is the zone where stream and shallow groundwater exchange, is addressed in many investigations. This zone is recognized for retention, transformation and attenuation of solutes and enables to improve water quality significantly, while it additionally serves as refuge and habitat for many aquatic organisms.

But even though the importance of groundwater and surface water interactions is nowadays recognized to a large extent, in numerical models both resources are still investigated separately in most cases due to different temporal dimensions. For investigations at the hyporheic zone, flow and transport processes are commonly determined using coupled numerical models. A surface water model and a groundwater model are executed successively, often with no feedback from groundwater to surface water. In contrast to previous research with coupled models, in the prevailing work, processes at the groundwater-surface water interface are investigated with an integral numerical model. Since high computational effort is needed for the application of the integral solver, processes on a small-scale close to the interface of surface water and porous media are focused on. In a first step, the two-phase solver interFoam is extended for the investigation of tracer retention and free surface flow at rippled streambeds. The Navier-Stokes equations are solved in combination with an implemented advection-diffusion equation. The transport of tracer pulses from surface water to dead zones between ripples at the streambed with varying morphologies and different surface hydraulics are examined.

Mots clés  : CFD ; hyporheic zone ; integral model ; OpenFOAM ; numerische Strömungsmechanik ; hyporheische Zone ; integrales Modell

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Page publiée le 13 novembre 2021