Author(s): Frida M. Niemi; Anders G. Andersson; J. Gunnar I. Hellstrom
Linked Author(s):
Keywords: No Keywords
Abstract: With an increase in intermittent energy sources, the energy supply becomes more unpredictable. The flexibility of hydropower is predicted to be more utilized to stabilize fluctuations and meet the demand in energy peaks. The increase of hydropeaking, frequent and rapid changes of discharge from the hydropower facilities, can impact the ecology of the river downstream. To capture the dynamics correctly and understand how modelling parameters could influence the hydrodynamics in the river, and in turn impact the habitat quality, this study investigates how sensitive a 2D hydraulic model is for different mesh properties, Manning roughness coefficient and downstream boundary conditions. The study determines how responsive the hydraulic model is to these parameters and how sensitive the results of ecohydraulic variables are in relation to this. Preliminary results show the differences in Manning coefficient for the Neumann gradient downstream boundary condition versus the water level boundary from measurements where the Neumann gradient tends to be more sensitive to changes in Manning numbers than the water level definition.
Year: 2024