University of Oulu

Hannah Wenng, Danny Croghan, Marianne Bechmann, Hannu Marttila; Hydrology under change: long-term annual and seasonal changes in small agricultural catchments in Norway. Hydrology Research 1 December 2021; 52 (6): 1542–1558. doi:

Hydrology under change: long-term annual and seasonal changes in small agricultural catchments in Norway

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Author: Wenng, Hannah1,2; Croghan, Danny3; Bechmann, Marianne1;
Organizations: 1The Norwegian Institute of Bioeconomy Research (NIBIO), P.O. Box 115, 1431 Ås, Norway
2Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Science (NMBU), P.O. Box 5003 NMBU, 1432 Ås, Norway
3Water, Energy and Environmental Engineering Research Unit, University of Oulu, P.O. Box 8000, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: IWA Publishing, 2021
Publish Date: 2022-02-08


In agricultural catchments, hydrological processes are highly linked to particle and nutrient loss and can lead to a degradation of the ecological status of the water. Global warming and land use changes influence the hydrological regime. This effect is especially strong in cold regions. In this study, we used long-term hydrological monitoring data (22–26 years) from small agricultural catchments in Norway. We applied a Mann–Kendall trend and wavelet coherence analysis to detect annual and seasonal changes and to evaluate the coupling between runoff, climate, and water sources. The trend analysis showed a significant increase in the annual and seasonal mean air temperature. In all sites, hydrological changes were more difficult to detect. Discharge increased in autumn and winter, but this trend did not hold for all catchments. We found a strong coherence between discharge and precipitation, between discharge and snow water equivalent and discharge and soil water storage capacity. We detected different hydrological regimes of rain and snow-dominated catchments. The catchments responded differently to changes due to their location and inherent characteristics. Our results highlight the importance of studying local annual and seasonal changes in hydrological regimes to understand the effect of climate and the importance for site-specific management plans.

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Series: Hydrology research
ISSN: 1998-9563
ISSN-E: 2224-7955
ISSN-L: 1998-9563
Volume: 52
Issue: 6
Pages: 1542 - 1558
DOI: 10.2166/nh.2021.066
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: The research project was supported by the Nordic Centre of Excellence BIOWATER, funded by NordForsk under Project No. 82263. The Ph.D. scholarship for Hannah Wenng is funded by the Research Council of Norway. The Norwegian Agricultural Environmental Monitoring Program (JOVA) is funded by the Ministry of Agriculture and Food and run by the Norwegian Institute for Bioeconomy Research (NIBIO). Open Access funding is provided by NIBIO.
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 (