title: Modelling the effects of stranding on the Atlantic salmon population in the Dale River, Norway.
abstract: Rapid dewatering in rivers as a consequence of hydropower operations may cause stranding of juvenile fish and have a negative impact on fish populations. We implemented stranding into an Atlantic salmon population model in order to evaluate long-term effects on the population in the Dale River, Western Norway. Furthermore, we assessed the sensitivity of the stranding model to dewatered area in comparison to biological parameters, and compared different methods for calculating wetted area, the main abiotic input parameter to the population model. Five scenarios were simulated dependent on fish life-stage, season and light level. Our simulation results showed largest negative effect on the population abundance for hydropeaking during winter daylight. Salmon smolt production had highest sensitivity to the stranding mortality of older juvenile fish, suggesting that stranding of fish at these life-stages is likely to have greater population impacts than that of earlier life-stages. Downstream retention effects on the ramping velocity were found to be negligible in the stranding model, but are suggested to be important in the context of mitigation measure design.
authors: SINTEF Energy Research, P.O. Box 4761, Sluppen, NO 7465 Trondheim, Norway; Sweco Norway, Professor Brochs gate 2, NO 7030 Trondheim, Norway. Electronic address: julian.sauterleute@sweco.no.
authors: Julian F
authors: JF
authors: Sauterleute
authors: Norwegian Institute for Nature Research, P.O. Box 5685, Sluppen, NO 7485 Trondheim, Norway.
authors: Richard D
authors: RD
authors: Hedger
authors: Institute for Water Management, Hydrology and Hydraulic Engineering, University of Natural Resources and Life Sciences, Muthgasse 107, 1190 Vienna, Austria.
authors: Christoph
authors: C
authors: Hauer
authors: Uni Research Environment, P.O. Box 7810, NO 5020 Bergen, Norway.
authors: Ulrich
authors: U
authors: Pulg
authors: Uni Research Environment, P.O. Box 7810, NO 5020 Bergen, Norway.
authors: Helge
authors: H
authors: Skoglund
authors: Norwegian Institute for Nature Research, P.O. Box 5685, Sluppen, NO 7485 Trondheim, Norway.
authors: Line E
authors: LE
authors: Sundt-Hansen
authors: SINTEF Energy Research, P.O. Box 4761, Sluppen, NO 7465 Trondheim, Norway.
authors: Tor Haakon
authors: TH
authors: Bakken
authors: Norwegian Institute for Nature Research, P.O. Box 5685, Sluppen, NO 7485 Trondheim, Norway.
authors: Ola
authors: O
authors: Ugedal
mesh_terms: D025041:Animal Migration; D000818:Animals; D008962:Models, Theoretical; D009664:Norway; D011157:Population Dynamics; D011210:Power Plants; D045483:Rivers / Q000737:chemistry*; D020317:Salmo salar / Q000254:growth & development* / Q000502:physiology*; D012621:Seasons; D014872:Water Movements
keywords: Hydropeaking; hydrodynamic numerical model; hydropower regulation; individual-based model; juvenile fish