Slope deposits and saprolites in the mid latitudes: the example of the prospection of the shallow subsurface of a slope in the Bavarian Forest, Germany, as a basic study for understanding surface water runoff, interflow and ground water storing on slopes

J. Voelkel, Juliane Huber, E. Lutterschmid, S. Placht, J. Roeder, Matthias Leopold, B. Hoersch

Research output: Contribution to journalAbstract/Meeting Abstract

Abstract

This study aims the three-dimensional prospection of the shallow subsurface applicating the combination of geomorphological, pedological and geophysical methods. This dataset will suit the purpose of modelling hydrological processes like surface water runoff and interflow within the slope and floodplain sediments in low mountain ranges. Slope geomorphology and slope sediments as well as the underlying saprolites are discussed to play a crucial role in all kinds of solved and particular material flows. The investigation area, the Otterbach Valley, is divided into significant units under the consideration of relief and lithology. In consideration of the 3rd order river catchment, the relief parameters of the slopes are recorded by a total station survey (LEICA TC 600) which are displayed in a high-resolution digital terrain model. Percussion drilling is used to determine the pedological and sedimentological composition of the subsurface. Furthermore the stratigraphy serves as a calibration tool for interpreting the geophysical signals. On upper and middle slope regions, refraction seismic and ground penetrating radar (GPR) measurements were carried out to differenciate between the periglacial layers, underlying saprolite and granitic bedrock. Saprolite is a profound weathering product of the in situ granites in the Bohemian Massif foothills. It acts as an important potential reservoir for slopewater and is therefore a significant criterion considering interflow modelling. The total water discharge in the slope area is measured by TDR probes which are situated in each stratigraphic layer. The floodplain is investigated by the application of the electrical resistivity tomography (ERT) because of the hydrological conditions in order to demonstrate the alluvial deposits, gravel, saprolite and granitic bedrock. The aim of the hydrological model is to map the quantity and quality of slope sediments in low mountain ranges. Therefore, the study helps for a better understanding of flood occurrences, intensities and frequencies. Furthermore it contributes more information to the discussion of the composition of periglacial layers.
Original languageEnglish
Article numberH43E-1680
JournalAmerican Geophysical Union Fall Meeting Abstracts
Volume2007
Publication statusPublished - Dec 2007
Externally publishedYes
EventAmerican Geophysical Union Fall Meeting 2007 - , United States
Duration: 1 Dec 2007 → …

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