NDLI: Hydrochemical tracers in the middle Rio Grande Basin, USA: 1. Conceptualization of groundwater flow

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Hydrochemical tracers in the middle Rio Grande Basin, USA: 1. Conceptualization of groundwater flow

Content Provider	Springer Nature Link
Author	Plummer, L. Niel Bexfield, Laura M. Anderholm, Scott K. Sanford, Ward E. Busenberg, Eurybiades
Copyright Year	2004
Abstract	Chemical and isotopic data for groundwater from throughout the Middle Rio Grande Basin, central New Mexico, USA, were used to identify and map groundwater flow from 12 sources of water to the basin, evaluate radiocarbon ages, and refine the conceptual model of the Santa Fe Group aquifer system.Hydrochemical zones, representing groundwater flow over thousands to tens of thousands of years, can be traced over large distances through the primarily siliciclastic aquifer system. The locations of the hydrochemical zones mostly reflect the “modern” predevelopment hydraulic-head distribution, but are inconsistent with a trough in predevelopment water levels in the west-central part of the basin, indicating that this trough is a transient rather than a long-term feature of the aquifer system. Radiocarbon ages adjusted for geochemical reactions, mixing, and evapotranspiration/dilution processes in the aquifer system were nearly identical to the unadjusted radiocarbon ages, and ranged from modern to more than 30 ka. Age gradients from piezometer nests ranged from 0.1 to 2 year cm$^{–1}$ and indicate a recharge rate of about 3 cm year$^{–1}$ for recharge along the eastern mountain front and infiltration from the Rio Grande near Albuquerque. There has been appreciably less recharge along the eastern mountain front north and south of Albuquerque.Des données sur les éléments chimiques et les isotopes présents dans l’eau souterraine prélevée à divers endroits dans le bassin moyen du Rio Grande, au centre du Nouveau-Mexique (É-U), ont permis de déterminer l’existence et l’étendue de douze sources d’eau régionales dans le bassin, d’évaluer les âges radiocarbones et de raffiner le modèle conceptuel du système aquifère du groupe de Santa Fe. Des zones hydro-chimiques qui représentent l’écoulement de l’eau souterraine depuis des dizaines de milliers d’années peuvent être suivies sur de longues distances à travers l’aquifère principalement siliclastique. La position des zones hydro-chimiques reflète principalement la distribution moderne des charges hydrauliques mais est incohérente avec une dépression dans le niveau d’eau dans la partie centre-ouest du bassin, ce qui indique que cette dépression est un élément transitoire du système aquifère plutôt qu’un élément à long terme. Les âges radiocarbones ajustés aux réactions géochimiques et aux processus de mélange et d’évapotranspiration/dilution qui ont lieu dans l’aquifère sont presque identiques aux âges non ajustés et varient de la période moderne jusqu’à 30 ka. Les gradients d’âge établis à partir des nids de piézomètres s’étendent de 0.1 à 2 a cm$^{–1}$ et suggèrent un taux de recharge d’environ 3 cm a$^{–1}$ le long du front des montagnes à l’est et pour l’infiltration provenant du Rio Grande près d’Albuquerque. Il y a eu substantiellement moins de recharge le long du front des montagnes à l’est, au nord et au sud d’Albuquerque. Se utilizaron datos químicos e isotópicos de agua subterránea a lo largo de la cuenca central del río Grande, Nuevo México, EEUU, para identificar y mapear el flujo de agua subterránea de 12 fuentes de agua a la cuenca para evaluar edades por medio de radio carbon y para refinar el modelo conceptual del sistema acuífero del Grupo Santa Fé. Se puede establecer zonas hidrotérmicas que representan el flujo de agua subterránea a lo largo de miles a miles de decenas de años en grandes distancias a través del sistema acuífero principalmente siliclástico. Las ubicaciones de las zonas hidroquímicas mayormente reflejan la distribucion de la cabeza hidráulica pre-desarollo moderna pero son inconsistentes con una depresión en los niveles de agua pre-desarollo en la zona central oeste de la cuenca. Esto indica que esta depresión es un rasgo transitorio y no un rasgo de largo plazo del sistema acuífero. Las edades de radio carbon ajustadas para los procesos de reaciones geoquímicas, de mezclado y de evapotranspiración-dilución son casi idénticas a los edades de radio carbon no ajustadas oscilan en un rango desde la modernidad a 30 mil años. Las gradientes de edad de nidos de piezometros van de 0.1 a 2 años cm$^{–1}$ e indican un sitio de recarga de aproximadamente 3 cm/yr para la recarga a lo largo del frente montañoso oriental e infiltración del río Grande cerca de Albuquerque. Se aprecia una recarga menor a lo largo del frente oriental de montañas al norte y al sur de Albuquerque.
Starting Page	359
Ending Page	388
Page Count	30
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	12
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-05-25
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arid regions Hydrochemistry New Mexico Radiocarbon age Stable isotopes
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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