Author(s): Nusrat Jahan Bipa; Giuseppe Roberto Pisaturo; Ianina Kopecki; Matthias Schneider; Markus Noack
Linked Author(s): Matthias Schneider, Markus Noack, IANINA KOPECKI, Giuseppe Roberto Pisaturo
Keywords: CASiMiR ecohydraulic model European grayling habitat suitability hydropeaking mitigation scenarios
Abstract: Hydropeaking, driven by hydropower operations, poses significant threats to aquatic ecosystems, particularly fish populations. This study assesses the effectiveness of various hydropeaking mitigation strategies on fish habitats in a 7 km section of the Lech River, Germany, with a focus on larvae of European grayling (Thymallus thymallus). The hydropeaking module of the CASiMiR ecohydraulic model was employed to simulate four scenarios, ranging from a baseline with no mitigation to advanced interventions including reduced downramping rates and morphological modifications, such as sidearms. The scenario that combines operational measure with slower turbine closing and re-connection of multiple sidearms, achieved the most substantial reduction of stranding risk for fish compared to baseline scenario. These findings underscore the importance of integrated strategies, combining operational adjustments and river morphology enhancements, to mitigate hydropeaking impacts and enhance habitat quality. This research highlights the potential of ecohydraulic modelling as a decision-support tool for balancing hydropower production with ecosystem conservation goals
Year: 2025