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Title (Primary) Transient analysis of fluctuations of electrical conductivity as tracer in the stream bed
Author Schmidt, C.; Musolff, A.; Trauth, N.; Vieweg, M.; Fleckenstein, J.H.;
Journal Hydrology and Earth System Sciences
Year 2012
Department HDG;
Volume 16
Issue 10
Language englisch;
UFZ wide themes TERENO;
Abstract Magnitudes and directions of water flux in the streambed are controlled by hydraulic gradients between the groundwater and the stream and by bedform-induced hyporheic exchange flows. These water fluxes vary over time driven by for instance by short term flood events or seasonal variations in stream flow and groundwater level. Variations of electrical conductivity (EC) are used as a natural tracer to detect transient travel times and flow velocities in an in-stream-gravel bar. We present a method to estimate travel times between the stream and measuring locations in the gravel bar by non-linearly matching the EC signals in the time domain. The amount of temporal distortion required to obtain the optimal matching is related to the travel time of the signal. Our analysis revealed that the travel-times increased at higher stream flows because lateral head gradients across the gravel bar are leveled at the time.

ID 12774
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=12774
Schmidt, C., Musolff, A., Trauth, N., Vieweg, M., Fleckenstein, J.H. (2012):
Transient analysis of fluctuations of electrical conductivity as tracer in the stream bed
Hydrol. Earth Syst. Sci. 16 (10), 3689 - 3697