University of Oulu

Duckett, K., Langman, J., Bush, J., Brooks, E., Dunlap, P., & Welker, J. (2019). Isotopic Discrimination of Aquifer Recharge Sources, Subsystem Connectivity and Flow Patterns in the South Fork Palouse River Basin, Idaho and Washington, USA. Hydrology, 6(1), 15. https://doi.org/10.3390/hydrology6010015

Isotopic discrimination of aquifer recharge sources, subsystem connectivity and flow patterns in the South Fork Palouse River Basin, Idaho and Washington, USA

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Author: Duckett, Kyle A.1; Langman, Jeff B.1; Bush, John H.1;
Organizations: 1Department of Geological Sciences, University of Idaho, Moscow, ID 83844, USA
2Department of Soil and Water Systems, University of Idaho, Moscow, ID 83844, USA
3Retired
4Department of Ecology and Genetics, Uarctic, University of Oulu, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019093030640
Language: English
Published: Multidisciplinary Digital Publishing Institute, 2019
Publish Date: 2019-09-30
Description:

Abstract

Groundwater studies in the South Fork Palouse River Basin have been unable to determine recharge sources, subsystem connectivity and flow patterns due to the discontinuity of pathways in the heterogeneous and anisotropic aquifers located in Columbia River flood basalts and interbedded sediments. Major ion, δ18O, δ2H, δ13C, δ34S and temperature for groundwater collected from 28 wells of varying depths indicate a primary recharge source dominated by snowmelt along the eastern basin margin. This recharge can be separated into two distinct sources—a deeper and relatively less altered snowmelt signal (−17.3‰ to −16.8‰ δ18O, −131‰ to −127‰ δ2H, −12.9‰ to −10‰ δ13C, 18–23 °C) and a more altered signal likely derived from a shallower mixture of snowmelt, precipitation and surface water (−16.1‰ to −15.5‰ δ18O, −121‰ to −117‰ δ2H, −15.9‰ to −12.9‰ δ13C, 12–19 °C). A mixing of the shallow and deep source waters is observed within the upper aquifer of the Grande Ronde Formation near Moscow, Idaho, which results in a homogenization of isotope ratios and geochemistry for groundwater at nearly any depth to the west of this mixing zone. This homogenized signal is prevalent in a likely primary productive zone of an intermediate depth in the overall aquifer system.

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Series: Hydrology
ISSN: 2306-5338
ISSN-E: 2306-5338
ISSN-L: 2306-5338
Volume: 6
Issue: 1
Article number: 15
DOI: 10.3390/hydrology6010015
OADOI: https://oadoi.org/10.3390/hydrology6010015
Type of Publication: A1 Journal article – refereed
Field of Science: 1172 Environmental sciences
Subjects:
Funding: This research was funded by the Palouse Basin Aquifer Committee.
Copyright information: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/