Site and Measurement Description

Schulz (Chapter 10), the dimensionality has been increased on behalf of the system s geochemical complexity. A virtual aquifer was produced and the oxidation of DOC by iron (hydr)oxides was simulated in a two-dimensional transport and reaction model. Both model attempts focus on different aspects and have different priorities but are based within the same region, using the same data set and should be regarded in context. 

Several redox-controlled, chemical changes occur when oxic river water enters into the anoxic aquifer. Along its flow-path, the water becomes progressively more reduced, making the region ideal for groundwater redox studies. A 1 km exemplary field-site Bahnbriicke , located adjacent to the river Oder in the northern Oderbruch, was chosen for detailed hydraulic and hydro chemical investigation. 

In 1999, 10 sediment cores were drilled at the field site, reaching to the base of the aquifer body. The instrumentation consists of 24 conventional piezometers at varying depths and three multilevel wells located in a distance of 3 to 620 m from the river (Fig. 11.1). The area has been intensively surveyed and monitored over 1V2 years for relevant parameters. A 3D transient hydraulic model serves as a base for investigating groundwater flow paths for different river levels. 

Most of the groundwater discharge occurs from a main drainage ditch, which runs parallel to the levee at 150 m distance from the river. The resulting infiltration is complex and has a strong vertical component (see Fig. 11.2). 

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