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Open AccessArticle

Long-Term Changes of Hydrological Variables in a Small Lowland Watershed in Central Poland

1
Department of Hydraulic Engineering, Warsaw University of Life Sciences–SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
2
Department of Geography, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
3
Department of Civil, Environmental, Architectural Engineering and Mathematics, Università degli Studi di Brescia, Via Branze 43, 25121 Brescia, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(3), 564; https://doi.org/10.3390/w11030564
Received: 2 February 2019 / Revised: 12 March 2019 / Accepted: 13 March 2019 / Published: 19 March 2019
(This article belongs to the Section Hydrology)
Climate-induced changes in small watersheds are still not well researched because long-term datasets are usually missing for these watersheds. Such studies can, however, improve our understanding of the watershed response to climatic changes at such a small scale being transparent. In this study, we investigate trends in temperature, precipitation and river-flow characteristics in a small watershed, typical for Central Poland, with 53 years of observations (1963–2015) using the Mann-Kendall test. Particularly, we examine whether any trends in hydro-meteorological variables can be identified, and if any associated changes in water resources in this region can already be observed. We found that this short period already allows for detecting some changes in hydro-meteorological variables. These changes could be characterized by a significant increase in the mean annual air temperature on a daily basis, and a significant decrease in the mean annual discharge on a daily basis and in the minimum annual discharge on a daily basis. Yet, no significant trend could be detected for the total annual precipitation, the maximum summer rainfall, and the maximum annual discharge on a daily basis. These findings indicate that water resources are decreasing in this region, which affects natural habitats, agriculture and local communities. View Full-Text
Keywords: climate change; trend analysis; small watershed; Mann-Kendall test; Central Poland climate change; trend analysis; small watershed; Mann-Kendall test; Central Poland
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Krajewski, A.; Sikorska-Senoner, A.E.; Ranzi, R.; Banasik, K. Long-Term Changes of Hydrological Variables in a Small Lowland Watershed in Central Poland. Water 2019, 11, 564.

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