NDLI: Stream water bypass through a meander neck, laterally extending the hyporheic zone

Content Provider	Springer Nature Link
Author	Peterson, Eric W. Sickbert, Timothy B.
Copyright Year	2006
Abstract	A meander lobe neck diverts stream water into a hyporheic flow path adjacent to a low gradient stream, Little Kickapoo Creek, Illinois, USA. Hyporheic processes have been well-documented in surface water–groundwater mixing zones underlying and directly adjacent to streams. Alluvial aquifers underlying meander necks provide a further extension of the hyporheic zone. Hydraulic head and temperature data, collected from a set of wells across a meander neck, show stream water moves through the meander neck. The hydraulic gradient across the meander neck (0.006) is greater than the stream gradient (0.003) between the same points, driving the bypass. Rapid subsurface response to elevated stream stage shows a hydraulic connection between the stream and the alluvial aquifer. Temperature data and a Peclet number (Pe) of 43.1 indicate that thermal transport is dominated by advection from the upstream side to the downstream side of the meander neck. The temperature observed within the alluvial aquifer correlates with seasonal temperature variation. Together, the pressure and temperature data indicate that water moves across the meander neck. The inflow of stream water through the meander neck suggests that the meander system may host biogeochemical hyporheic zone processes.Le lobe d’un méandre abandonné dérive l’eau d’une rivière vers la zone d’écoulement hyporhéique, adjacent à un cours d’eau à faible gradient, dans le bassin de Little Kickapoo, Illinois, USA. Le processus hyporhéique a été bien documenté en tant que zones de mélange, sous le cours d’eau et directement adjacent à ce dernier. Les aquifères alluviaux situés sous le méandre abandonné, représentent une extension éloignée de la zone hyporhéique. Les données piézométriques ainsi que les données de température, collectées dans différents puits situés à travers le méandre en question, montrent que l’eau souterraine s’écoule à travers ce dernier. Le gradient hydraulique à travers le méandre (0.006) est plus important que le gradient de la rivière voisine (0.003) mesuré entre les mêmes points. La réponse rapide de la sub-surface, lors des fluctuations du niveau du cours d’eau, montre qu’il existe une connection entre ce dernier et l’aquifère alluvial. Les données de température et le nombre de Péclet (43.1) indiquent que le transport thermique est dominé par le mouvement d’advection de l’amont vers l’aval du méandre étudié. La température levée dans l’aquifère alluvial a été corrélée avec les variations saisonnières de la température. Ensemble, la pression et la température indiquent que l’eau traverse le méandre. L’écoulement à travers le cours d’eau vers le méandre, suggère que le système du méandre pourrait abriter des processus biogéochimiques propres aux zones hyporhéiques.Un lóbulo de cuello de meandro desvía agua de río hacia una ruta de flujo hiporreica adyacente a un arroyo de gradiente bajo en el Arroyo Pequeño Kickapoo, Illinois, USA. Se han documentado bastante bien procesos hiporreicos en zonas de mezcla de agua subterránea con agua superficial las cuales subyacen y son adyacentes a los ríos. Los acuíferos aluviales que subyacen cuellos de meandros aportan extensión adicional de la zona hiporreica. Los datos de temperatura y presión hidráulica que se colectaron en un grupo de pozos a través del cuello de meandro muestran que el agua del río se mueve a través del cuello de meandro. El gradiente hidráulico a través del cuello de meandro (0.006) es mayor que el gradiente fluvial (0.003) entre los mismos puntos que conducen el desvío. La respuesta subsuperficial rápida al nivel elevado del río muestra una conexión hidráulica entre el río y el acuífero aluvial. Los datos de temperatura y el número de Peclet (Pe) de 43.1 indican que el transporte termal es dominado por advección desde la parte alta del río hasta la parte baja del cuello de meandro. La temperatura observada dentro del acuífero aluvial correlaciona con la variación estacional de la temperatura. De manera conjunta, los datos de presión y temperatura indican que el agua se mueve a través del cuello de meandro. La entrada de agua de río a través del cuello de meandro sugiere que el sistema de meandro puede alojar una zona hiporreica de procesos biogeoquímicos.
Starting Page	1443
Ending Page	1451
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	14
Issue Number	8
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-14
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater/surface water relations Temperature Hyporheic zone Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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