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| Titel |
Transient analysis of fluctuations of electrical conductivity as tracer in the stream bed |
| VerfasserIn |
C Schmidt, A. Musolff, N. Trauth, M. Vieweg, J. H. Fleckenstein |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 10 ; Nr. 16, no. 10 (2012-10-17), S.3689-3697 |
| Datensatznummer |
250013522
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| Publikation (Nr.) |
 copernicus.org/hess-16-3689-2012.pdf |
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| Zusammenfassung |
| Spatial patterns of water flux in the stream bed are controlled by the
distribution of hydraulic conductivity, bedform-induced head gradients and
the connectivity to the adjoining groundwater system. The water fluxes vary
over time driven 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
increase at higher stream flows because lateral head gradients across the
gravel bar become significantly smaller at the time. |
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