Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Using environmental isotopes 2H and 18O for identification of infiltration processes in floodplain ecosystems of the river Elbe
Autor Böhnke, R.; Geyer, S.; Kowski, P.;
Journal / Serie Isotopes in Environmental and Health Studies
Erscheinungsjahr 2002
Department HDG;
Band/Volume 38
Heft 1
Sprache englisch;
Abstract We examined a floodplain area in the middle section of the river Elbe Valley with regard to hydrogeological and hydrological processes using isotopic methods. Over two years, river water and groundwater have been analysed for temporal and spatial chemical and isotopic (δ2H and δ18O) changes. By these methods we assessed the flow dynamics of the river-groundwater infiltration system. At low and mean river stages there is a general hydraulic gradient from the higher areas at the margin of the valley towards the floodplain. During floods river water infiltrates into the adjacent aquifer not primarily through the river banks but first through surface water inflow from north to south, via depressions and gullies from the back of the floodplain. The early stage of river water infiltration is characterized by a sharp decrease in conductivity and in concentrations of SO4 2- and Cl in the hydraulically connected shallow aquifer. δ2H and δ18O values show a similar tendency. We observed a significant minimum in stable isotope ratios during the flood in March 1999. Using a simple mixing equation it was calculated that the groundwater in the upper, shallow aquifer consists of around 70% river water in the transition zone (well 13) during flooding.
ID 5387
dauerhafte UFZ-Verlinkung http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=5387
Böhnke, R., Geyer, S., Kowski, P. (2002):
Using environmental isotopes 2H and 18O for identification of infiltration processes in floodplain ecosystems of the river Elbe
Isot. Environ. Health Stud. 38 (1), 1 - 13