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research article

Linking water age and solute dynamics in streamflow at the Hubbard Brook Experimental Forest, NH, USA

Benettin, Paolo  
•
Bailey, Scott W.
•
Green, Mark B.
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2015
Water Resources Research

We combine experimental and modeling results from a headwater catchment at the Hubbard Brook Experimental Forest (HBEF), New Hampshire, USA, to explore the link between stream solute dynamics and water age. A theoretical framework based on water age dynamics, which represents a general basis for characterizing solute transport at the catchment scale, is here applied to conservative and weathering-derived solutes. Based on the available information about the hydrology of the site, an integrated transport model was developed and used to compute hydrochemical fluxes. The model was designed to reproduce the deuterium content of streamflow and allowed for the estimate of catchment water storage and dynamic travel time distributions (TTDs). The innovative contribution of this paper is the simulation of dissolved silicon and sodium concentration in streamflow, achieved by implementing first-order chemical kinetics based explicitly on dynamic TTD, thus upscaling local geochemical processes to catchment scale. Our results highlight the key role of water stored within the subsoil glacial material in both the short-term and long-term solute circulation. The travel time analysis provided an estimate of streamflow age distributions and their evolution in time related to catchment wetness conditions. The use of age information to reproduce a 14 year data set of silicon and sodium stream concentration shows that, at catchment scales, the dynamics of such geogenic solutes are mostly controlled by hydrologic drivers, which determine the contact times between the water and mineral interfaces. Justifications and limitations toward a general theory of reactive solute circulation at catchment scales are discussed.

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Type
research article
DOI
10.1002/2015WR017552
Web of Science ID

WOS:000368420000033

Author(s)
Benettin, Paolo  
•
Bailey, Scott W.
•
Green, Mark B.
•
Rinaldo, Andrea  
•
Likens, Gene E.  
•
McGuire, Kevin J.
•
Botter, Gianluca
Date Issued

2015

Publisher

American Geophysical Union

Published in
Water Resources Research
Volume

51

Issue

11

Start page

9256

End page

9272

Subjects

travel time distributions

•

water age

•

silica

•

Hubbard Brook

•

deuterium

•

solute transport

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ECHO  
Available on Infoscience
January 5, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/121995
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