En flödesanalys för Kävlingeån – HEC-RAS modellering med fokus på dämmens inverkan / An analysis of the Kävlinge River flow situation – HEC-RAS modeling with focus on the effects of weirs
Kävlinge River is one of the largest, and most heavily fish-populated, watercourses in Scania. Eight dams and three active hydroelectric plants are located here, which cause environmental problems; organisms are prevented migration, reproduction and feeding being the biggest issues. Trout and eel, which depend on river accessibility and spawning areas, inhabits the river. This study aims to create a hydraulic model over Kävlinge River, with the purpose of analyzing flow simulations for the effects of proposed dam removals. A shorter model was created from sonar-based data sources, as well as a longer model in which bathymetry was estimated from different data sources. Simulations showed that at least 83 % of the area between Högsmölla and Håstad mölla is dammed, and that the river have potential for recreating areas with higher water velocities; mainly by lowering the dam at Högsmölla. The shorter model showed possible creation of 400–6500 square meters increase in stretches combining the dams at Högsmölla, Silverforsen and Rinnebäck with fauna passages and partial dam removal. The corresponding result for the longer model was 1200–17000 square meters including the dams at Lilla Harrie, Bösmöllan and Kvarnvik. This result, however, has a greater uncertainty.