Author(s): J. Bastian Holler; Anders G. Andersson; J. Gunnar I. Hellstrom
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Abstract: Hydropower plays a central role in the future energy supply. Nevertheless, it has adverse effects on the ecosystem that need to be reduced and mitigated to make hydropower sustainable. This paper aims to investigate the effects of mitigation measures in a bypass reach in Northern Sweden. The mitigation measures include a seasonal adaption of the minimum discharge and destruction of anthropogenic hydraulic structures as a morphologic measure. A hydraulic 2d-model was used to investigate the hydraulic effects of the measures. The results show that the seasonal adaption of the minimum discharge led to a larger variation in hydraulic conditions. The range of water level variation is increased by 23 cm and the maximum inundated area is increased by 10 %. The total annual amount of water for the minimum discharge is left unchanged. Especially the increased inundation area and varying inundation periods in the riparian zone have the potential for improved riparian ecosystems. The morphologic measures in another river section showed less impact in the hydraulic models. The results show how hydraulic modeling can be used to evaluate the effects of mitigation measures on the hydraulics. In a further step, these hydraulic results can be used for ecohydraulic analysis and to compare different measures.
Year: 2024