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J. Derx, A. Blaschke:
"Dynamic 3D numerical Simulations of Groundwater Exchange Processes at the Danube Riverbank";
Vortrag: EGU General Assembly 2008, Wien; 13.04.2008 - 18.04.2008; in: "Geophysical Research Abstracts", 10 (2008), Paper-Nr. 1607-7962/gra/EGU2008-A-08219, 1 S.

The study includes in particular the groundwater flow directions and velocities at the riverbank in dependency of the river water table and the time. Instead of solving a coupled surface - subsurface approach, our model sets the conditions at the rivergroundwater boundary dynamically. These methods allow for solving the non-linear numerical differential equations in a computationally efficient way.

The second part of this work focuses on the simultaneous simulation of energy transport and groundwater flow. The energy transport model is based on the numerical solution of the advection-dispersion equation and accounts for the temperature dependent parameters (fluid density, fluid dynamic viscosity). Based on the different temperature characteristics in the river and the groundwater, the extent of the mixing-zone within the hyporheic zone can be identified. Furthermore we can determine the influence of seasonal temperature variations on the amount of aquifer recharge by infiltration.

The results show that our model can reproduce the complex situation of the Danube river groundwater interaction accurately in three dimensions. Furthermore the energy simulation results indicate the importance of considering temperature dependent factors.

http://www.cosis.net/abstracts/EGU2008/08219/EGU2008-A-08219.pdf