University of Oulu

H. Marttila, M. Aurela, L. Büngener, P. M. Rossi, A. Lohila, H. Postila, M. Saari, T. Penttilä, B. Kløve; Quantifying groundwater fluxes from an aapa mire to a riverside esker formation. Hydrology Research 1 April 2021; 52 (2): 585–596. doi:

Quantifying groundwater fluxes from an aapa mire to a riverside esker formation

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Author: H. Marttila1; Aurela, M.2; Büngener, L.1;
Organizations: 1Water, Energy and Environmental Engineering Research Unit, University of Oulu, P.O. Box 8000, 90014 Oulu, Finland
2Finnish Meteorological Institute, Climate System Research, P.O. Box 503, 00101 Helsinki, Finland
3Natural Resources Institute Finland, Latokartanonkaari 9, 00790 Helsinki, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: IWA Publishing, 2021
Publish Date: 2021-06-08


Water flows in peatland margins is an under-researched topic. This study examines recharge from a peatland to an esker aquifer in an aapa mire complex of northern Finland. Our objective was to study how the aapa mire margin is hydrogeologically connected to the riverside aquifer and spatial and temporal variations in the recharge of peatland water to groundwater (GW). Following geophysical studies and monitoring of the saturated zone, a GW model (MODFLOW) was used in combination with stable isotopes to quantify GW flow volumes and directions. Peatland water recharge to the sandy aquifer indicated a strong connection at the peatland–aquifer boundary. Recharge volumes from peatland to esker were high and rather constant (873 m³ d⁻¹) and dominated esker recharge at the study site. The peat water recharging the esker boundary was rich in dissolved organic carbon (DOC). Stable isotope studies on water (δ¹⁸O, δ²H, and d-excess) from GW wells verified the recharge of DOC-rich water from peatlands to mineral soil esker. Biogeochemical analysis revealed changes from DOC to dissolved inorganic carbon in the flow pathway from peatland margin to the river Kitinen. This study highlights the importance of careful investigation of aapa mire margin areas and their potential role in regional GW recharge patterns.

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Series: Hydrology research
ISSN: 1998-9563
ISSN-E: 2224-7955
ISSN-L: 1998-9563
Volume: 52
Issue: 2
Pages: 585 - 596
DOI: 10.2166/nh.2021.064
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: This study was funded and supported by the Kvantum Institute Spearhead Project and the K.H. Renlund Foundation.
Copyright information: © 2021 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY-NC-ND 4.0), which permits copying and redistribution for non-commercial purposes with no derivatives, provided the original work is properly cited (