Changes in river runoff in Latvia at the end of the 21st century

  • Elga Apsite University of Latvia
  • Anda Bakute
  • Liga Kurpniece
  • Inese Pallo
Keywords: river runoff, climate change, scenario, rainfall-runoff model, Latvia

Abstract

This study deals with future climate change impacts on the runoff of five Latvian river basins at the end of this century. Climate data series have been provided by the Faculty of Physics and Mathematics of the University of Latvia where the regional climate model Rossby Centre Atmosphere Ocean was selected for further statistical downscaling. Changes in hydrometeorological data have been analysed based upon one control run (period 1961-1990) and two future scenarios A2 and B2 runs (2071-2100). The conceptual rainfall-runoff model, the latest version of METQ2007BDOPT, was used for simulation of hydrological processes in particular river basins. Simulation results revealed that in comparison to the control period, major differences in hydrometeorological parameters in future were observed according to A2 scenario, where long-term mean air temperature will grow by 4 degrees and precipitation – by 12 %, while mean annual river flow will decrease by 19 %. Both scenarios demonstrate changes in seasonal runoff patterns where the major part of river runoff will be generated in winter, followed by spring, autumn and summer. The river hydrograph is going to take a different shape, where the maximum river discharges will occur in winter instead of spring.
Section
Research Papers
Published
Nov 11, 2010
How to Cite
Apsite, E., Bakute, A., Kurpniece, L., & Pallo, I. (2010). Changes in river runoff in Latvia at the end of the 21st century. Fennia - International Journal of Geography, 188(1), 50–60. Retrieved from https://fennia.journal.fi/article/view/2844