Nat. Hazards Earth Syst. Sci., 20, 1–23, 2020 https://doi.org/10.5194/nhess-20-1-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Hydrological impacts of climate change on small ungauged catchments – results from a GCM–RCM–hydrologic model chain Aynalem T. Tsegaw1, Marie Pontoppidan2, Erle Kristvik1, Knut Alfredsen1, and Tone M. Muthanna1 1Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), S. P. Andersensvei 5, 7491 Trondheim, Norway 2NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway Correspondence: Aynalem T. Tsegaw (
[email protected]) Received: 28 October 2019 – Discussion started: 4 December 2019 Revised: 10 June 2020 – Accepted: 26 June 2020 – Published: Abstract. TS1 Climate change is one of the greatest threats tainty. Nevertheless, the study increases our knowledge and currently facing the world’s environment. In Norway, a understanding of the hydrological impacts of climate change change in climate will strongly affect the pattern, frequency, on small catchments in the Bergen area in the western part of and magnitudes of stream flows. However, it is challenging Norway. 35 5 to quantify to what extent the change will affect the flow pat- terns and floods from small rural catchments due to the un- availability or inadequacy of hydro-meteorological data for the calibration of hydrological models and due to the tailor- 1 Introduction ing of methods to a small-scale level. To provide meaningful 10 climate impact studies at the level of small catchments, it is Climate change is one of the greatest threats to human exis- therefore beneficial to use high-spatial- and high-temporal- tence, economic activity, ecosystems, and civil infrastructure resolution climate projections as input to a high-resolution (Kim and Choi, 2012).