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Groundwater-surface water interactions across scales in a boreal landscape investigated using a numerical modelling approach
Swedish Univ Agr Sci, Dept Forest Ecol & Management, Umeå, Sweden; DHI Sweden AB, Stockholm, Sweden.
Swedish Nucl Fuel & Waste Management Co, Solna, Sweden.
Stockholm Univ, Dept Phys Geog, Stockholm, Sweden; Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.ORCID iD: 0000-0002-3367-5077
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2018 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 560, p. 184-201Article in journal (Refereed) Published
Abstract [en]

Groundwater and surface-water interactions are regulated by catchment characteristics and complex inter- and intra-annual variations in climatic conditions that are not yet fully understood. Our objective was to investigate the influence of catchment characteristics and freeze-thaw processes on surface and groundwater interactions in a boreal landscape, the Krycklan catchment in Sweden. We used a numerical modelling approach and sub-catchment evaluation method to identify and evaluate fundamental catchment characteristics and processes. The model reproduced observed stream discharge patterns of the 14 sub-catchments and the dynamics of the 15 groundwater wells with an average accumulated discharge error of 1% (15% standard deviation) and an average groundwater-level mean error of 0.1 m (0.23 m standard deviation). We show how peatland characteristics dampen the effect of intense rain, and how soil freeze-thaw processes regulate surface and groundwater partitioning during snowmelt. With these results, we demonstrate the importance of defining, understanding and quantifying the role of landscape heterogeneity and sub-catchment characteristics for accurately representing catchment hydrological functioning.

Place, publisher, year, edition, pages
2018. Vol. 560, p. 184-201
Keywords [en]
Runoff generation, MIKE SHE, Krycklan, Water balance, Soil frost, Catchment
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:uu:diva-356085DOI: 10.1016/j.jhydrol.2018.03.011ISI: 000430882300015OAI: oai:DiVA.org:uu-356085DiVA, id: diva2:1233009
Funder
Swedish Research CouncilSwedish Nuclear Fuel and Waste Management Company, SKBAvailable from: 2018-07-13 Created: 2018-07-13 Last updated: 2018-07-13Bibliographically approved

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