Muuttuvat jokivirtaamat: ilmaston ja energian tarpeen muutoksien yhteisvaikutus pohjoissa joissa Following are the main research questions of the research: 1) How river regulation and climate change has modified flow regimes in Nordic rivers? 2) What are the characteristics of sub-daily flow conditions (hydro-peaking) due to river regulation operations in Nordic countries? 3) What aspects of peaking are contrary to a healthy river ecosystem and which are not? 4) How can we get more information out of existing data by using regional and basin-scale analyses? 5) How could hydro-peaking impacts be diminished with future regulation?