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Groundwater-surface water interactions across scales in a boreal landscape investigated using a numerical modelling approach
Stockholm University, Faculty of Science, Department of Physical Geography.
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Number of Authors: 52018 (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
Civil Engineering Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-156624DOI: 10.1016/j.jhydrol.2018.03.011ISI: 000430882300015OAI: oai:DiVA.org:su-156624DiVA, id: diva2:1210314
Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-05-28Bibliographically approved

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