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Comparison of tracer methods to quantify hydrodynamic exchange within the hyporheic zone

Engelhardt, Irina and Piepenbrink, Matthias and Trauth, Nico and Stadler, S. and Kludt, Christoph and Schulz, M. and Schüth, Christoph and Ternes, T. A. (2011):
Comparison of tracer methods to quantify hydrodynamic exchange within the hyporheic zone.
In: Journal of Hydrology, Elsevier, pp. 255-266, 400, (1-2), ISSN 00221694, DOI: 10.1016/j.jhydrol.2011.01.033, [Online-Edition: https://www.sciencedirect.com/science/article/pii/S002216941...],
[Article]

Abstract

Hydrodynamic exchange between surface-water and groundwater was studied at a river located within the Rhine Valley in Germany. Piezometric pressure heads and environmental tracers such as temperature, stable isotopes, chloride, X-ray contrast media, and artificial sweetener were investigated within the hyporheic zone and river water plume. Vertical profiles of environmental tracers were collected using multi-level wells within the neutral up-gradient zone, beneath the river bed, and within the horizontal proximal and distal down-gradient zone. Infiltration velocities were calculated from pressure heads, temperature fluctuations and gradients. The amount of river water within groundwater was estimated from vertical profiles of chloride, stable isotopes, and persistent pharmaceuticals. Profiles of stable isotopes and chloride reveal the existence of down-welling within the shallow hyporheic zone that is generated by river bed irregularities. Due to down-welling an above-average migration of river water into the hyporheic zone establishes even under upward hydraulic pressure gradients. The investigated environmental tracers could not distinctively display short-time-infiltration velocities representative for flood waves, while average infiltration velocities calculated over several months are uniform displayed. Based on vertical temperature profiles the down-gradient migration of the river water plume could be observed even after long periods of effluent conditions and over a distance of 200. m from the river bank. X-ray contrast media and artificial sweeteners were observed in high concentrations within the proximal zone, but were not detected at a distance of 200. m from the river bank. Using temperature as environmental tracer within the hyporheic zone may result in overestimating the migration of pollutants within the river water plume as the process of natural attenuation will be neglected. Furthermore, temperature was not able to display the effect of down-welling. Stable isotopes and chloride were found to be suitable environmental tracers to forecast the release and fate of organic contaminants within the hyporheic zone. © 2011 Elsevier B.V.

Item Type: Article
Erschienen: 2011
Creators: Engelhardt, Irina and Piepenbrink, Matthias and Trauth, Nico and Stadler, S. and Kludt, Christoph and Schulz, M. and Schüth, Christoph and Ternes, T. A.
Title: Comparison of tracer methods to quantify hydrodynamic exchange within the hyporheic zone
Language: English
Abstract:

Hydrodynamic exchange between surface-water and groundwater was studied at a river located within the Rhine Valley in Germany. Piezometric pressure heads and environmental tracers such as temperature, stable isotopes, chloride, X-ray contrast media, and artificial sweetener were investigated within the hyporheic zone and river water plume. Vertical profiles of environmental tracers were collected using multi-level wells within the neutral up-gradient zone, beneath the river bed, and within the horizontal proximal and distal down-gradient zone. Infiltration velocities were calculated from pressure heads, temperature fluctuations and gradients. The amount of river water within groundwater was estimated from vertical profiles of chloride, stable isotopes, and persistent pharmaceuticals. Profiles of stable isotopes and chloride reveal the existence of down-welling within the shallow hyporheic zone that is generated by river bed irregularities. Due to down-welling an above-average migration of river water into the hyporheic zone establishes even under upward hydraulic pressure gradients. The investigated environmental tracers could not distinctively display short-time-infiltration velocities representative for flood waves, while average infiltration velocities calculated over several months are uniform displayed. Based on vertical temperature profiles the down-gradient migration of the river water plume could be observed even after long periods of effluent conditions and over a distance of 200. m from the river bank. X-ray contrast media and artificial sweeteners were observed in high concentrations within the proximal zone, but were not detected at a distance of 200. m from the river bank. Using temperature as environmental tracer within the hyporheic zone may result in overestimating the migration of pollutants within the river water plume as the process of natural attenuation will be neglected. Furthermore, temperature was not able to display the effect of down-welling. Stable isotopes and chloride were found to be suitable environmental tracers to forecast the release and fate of organic contaminants within the hyporheic zone. © 2011 Elsevier B.V.

Journal or Publication Title: Journal of Hydrology
Volume: 400
Number: 1-2
Publisher: Elsevier
ISBN: 0022-1694
Uncontrolled Keywords: Artificial sweeteners,Environmental tracer,Hyporheic zone,Stable isotopes,Surface-water-groundwater interactions,X-ray contrast media
Divisions: 11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Hydrogeology
11 Department of Materials and Earth Sciences
Date Deposited: 17 Apr 2018 12:23
DOI: 10.1016/j.jhydrol.2011.01.033
Official URL: https://www.sciencedirect.com/science/article/pii/S002216941...
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