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Self-potential Investigations of a Gravel Bar in a Restored River Corridor : Volume 7, Issue 6 (18/11/2010)

By Linde, N.

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Book Id: WPLBN0004012734
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Self-potential Investigations of a Gravel Bar in a Restored River Corridor : Volume 7, Issue 6 (18/11/2010)  
Author: Linde, N.
Volume: Vol. 7, Issue 6
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Linde, N., Vogt, T., Dürst, Y., Luster, J., Pasquale, N., Minsley, B. J.,...Genoni, O. (2010). Self-potential Investigations of a Gravel Bar in a Restored River Corridor : Volume 7, Issue 6 (18/11/2010). Retrieved from http://hawaiilibrary.net/


Description
Description: Institute of Geophysics, University of Lausanne, Lausanne, Switzerland. Self-potentials (SP) are sensitive to water fluxes and concentration gradients in both saturated and unsaturated geological media, but quantitative interpretations of SP field data are often hindered by the superposition of different source contributions and time-varying electrode potentials. Self-potential mapping and close to two months of SP monitoring on a gravel bar were performed to investigate the origins of SP signals at a restored river section of the Thur River in northeastern Switzerland. The SP mapping and subsequent inversion of the data indicate that the SP sources are mainly located in the upper few meters in regions of soil cover rather than bare gravel. Wavelet analyses of the time-series indicate a strong, but non-linear influence of water table and water content variations, as well as rainfall intensity on the recorded SP signals. Modeling of the SP response with respect to an increase in the water table elevation and precipitation indicate that the distribution of soil properties in the vadose zone has a very strong influence. We conclude that the observed SP responses on the gravel bar are more complicated than previously proposed relationships between SP signals and hydraulic head or the thickness of the vadose zone. We suggest that future SP monitoring in restored river corridors should either focus on quantifying vadose zone processes by installing vertical profiles of closely spaced SP electrodes or by installing the electrodes within the river to avoid signals arising from vadose zone processes and time-varying electrochemical conditions in the vicinity of the electrodes.

Summary
Self-potential investigations of a gravel bar in a restored river corridor

Excerpt
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