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Sustainability 2018, 10(9), 3265; https://doi.org/10.3390/su10093265

Continuous Seasonal and Large-Scale Periglacial Reservoir Sedimentation

1
Laboratory of Hydraulics, Hydrology and Glaciology, ETH Zurich, 8093 Zurich, Switzerland
2
Swiss Competence Center for Energy Research (SCCER–SoE), ETH Zurich, 8093 Zurich, Switzerland
3
ZHAW Life Sciences and Facility Management, Institute of Natural Resource Sciences, 8820 Waedenswil, Switzerland
4
Repower, 7240 Kueblis, Switzerland
5
HYDRO Exploitation, 1950 Sion, Switzerland
Former employee of Alpiq, 1003 Lausanne, Switzerland.
*
Author to whom correspondence should be addressed.
Received: 30 April 2018 / Revised: 1 September 2018 / Accepted: 11 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue Hydropower Production)
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Abstract

Sustainable reservoir use is globally threatened by sedimentation. It has been generally recognized that inadequate consideration of reservoir sedimentation has caused the worldwide decline of net storage. Numerical models are useful tools to simulate sedimentation processes and can be used to derive efficient counter-measures and sediment management strategies. They can be applied to both existing and potential future reservoirs to predict long-term sedimentation. In this study, an application of a simple, robust, and stable numerical 1D model to Gebidem reservoir in Switzerland accompanied by field measurements is presented. It focusses on seasonal and large-scale reservoir sedimentation processes that occur continuously throughout the whole deposition season, while episodic events like turbidity currents are not taken into account. The model simulates both the delta formation of coarse sediments and the lake-wide sedimentation from homopycnal flows. The model is used to assess the effects and significance of varying boundary conditions like inflow, suspended sediment concentration, particle size distribution (PSD), or reservoir operation. It will be demonstrated that future reservoir operation and PSD are as important as future runoff evolution. Based on these findings, implications on future reservoir operation, also considering climate change, are discussed. Finally, an outlook on pending research topics is given. View Full-Text
Keywords: reservoir sedimentation; climate change; numerical 1D model; periglacial environment; delta formation; sedimentation from homopycnal flows reservoir sedimentation; climate change; numerical 1D model; periglacial environment; delta formation; sedimentation from homopycnal flows
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Ehrbar, D.; Schmocker, L.; Doering, M.; Cortesi, M.; Bourban, G.; Boes, R.M.; Vetsch, D.F. Continuous Seasonal and Large-Scale Periglacial Reservoir Sedimentation. Sustainability 2018, 10, 3265.

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