Hydraulic classification of hydropeaking stages in a river reach

Hydropower is an important tool in the struggle for low-emission power production. In Nordic countries, hydropower operating conditions are expected to change and work more conjunction with intermittent This turn might increase amount of hydropeaking events reaches downstream plants. The current investigates influence highly flexible, high-frequency on hydrodynamics reach. By quantifying four different dynamic stages study reach, frequencies was investigated bypass reach Stornorrfors plant river Umeälven northern Sweden. were numerically modelled using open source solver Delft3D. Eight flexible future scenarios, varying from 12 60 flow changes per day, considered. A method identifying stages—dewatering, dynamic, alternating uniform —was introduced. frequency directly decided stage most Furthermore, a Fourier analysis showed significant difference between their corresponding spectra. classification put forward this provides novel, simple investigate due