Groundwater-surface water interactions across scales in a boreal landscape investigated using a numerical modelling approach

JOURNAL OF HYDROLOGY

卷:560

Article

Sterte, Elin Jutebring^1,3  Johansson, Emma²  Sjoberg, Ylva^4,5  Karlsen, Reinert Huseby⁶  Laudon, Hjalmar¹ 

[1] Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden

[2] Swedish Nucl Fuel & Waste Management Co, Box 3091, S-16903 Solna, Sweden

[3] DHI Sweden AB, Svartmangatan 18, SE-11129 Stockholm, Sweden

[4] Stockholm Univ, Dept Phys Geog, SE-10691 Stockholm, Sweden

[5] Stockholm Univ, Bolin Ctr Climate Res, SE-10691 Stockholm, Sweden

[6] Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden

关键词: Runoff generation;    MIKE SHE;    Krycklan;    Water balance;    Soil frost;    Catchment;   

DOI  :  10.1016/j.jhydrol.2018.03.011

来源: Elsevier

【 摘 要 】

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. (C) 2018 The Authors. Published by Elsevier B.V.

【 授权许可】

Free