Gravel augmentation measure at the Limmat river (2019). Carlos R. Wyss.

Workshops

Each workshop begins with short input presentations by practitioners and researchers that illuminate the workshop topic through concrete examples, experiences and problems. Then there is time for a moderated exchange and discussion open for all participants. The moderator summarizes the discussion and it will be documented later in the proceedings. The speakers will be announced later in summer on this website. The workshop duration is 60 minutes. They will be conducted in French or German and will be simultaneously translated into English.

Series 1 – 8.11.2021 | 14:45 – 16:00

  • 1.1 – What are measures for sediment continuity at dams and weirs and proof of concept?
  • 1.2 – What is the role of bed load transport intensity for morphodynamics and ecology?
  • 1.3 – What are new tools for predicting and monitoring bed load transport and depositions?
  • 1.4 – How to approach risks and uncertainties of bedload restoration measures?

Series 2 – 8.11.2021 | 16:00 – 17:15

  • 2.1 – How to restore bedload transport at a cascade of installations?
  • 2.2 – How to deal with fine sediments in the context of bed load restorations?
  • 2.3 – Down-to-earth sediment management in small catchments
  • 2.4 – How to plan and predict bed load additions?

Series 3 – 9.11.2021 | 14:20 – 15:35

  • 3.1 – How to design and plan an environmental flow?
  • 3.2 – How can we prove the ecological success of bed load restoration?
  • 3.3 – What are important research gaps for successful projects?
  • 3.4 – How to improve bed load field measurements?
Excursions

Excursion 1: Bed load management and restoration in the Aare headwaters Gadmer valley and Hasli valley (Canton Bern)

This excursion leads you to the alpine headwaters of the Aare, where bed load transport is very dynamic and needs to be managed to protect populated areas and hydropower infrastructure. We start in the Gadmer valley, where we learn about the restoration of a large sediment retention basin, the morphological changes downstream and the influence of the residual flow regime on morphology and fish ecology. Later we visit the neighboring Hasli valley to learn about bed load management strategies in the hydropower reservoirs. The excursion ends at the Grimsel Hospice, where we enjoy a breathtaking view of reservoirs amidst high alpine granite mountains.

  • Start: 08:30 Interlaken
  • End (approx): 16:30 Meiringen, 17:10 Interlaken

Photo: Dr. Manuel Nitsche

 

Excursion 2: EcomorphologicaI effects of artificial floods in the Sarine floodplain (Canton Fribourg)

The excursion starts at the dam at Rossens with a general introduction on the history of the dam, technical facts as well as on river and floodplain ecomorpholgy in the context of residual flow management. If possible a guided tour into the dam will be provided by the hydropower company. The afternoon program continues downstream of the dam in the river floodplain at Hauterive where the ecomorphological effects of artificial flood releases will be illustrated for the Sarine on site in comparison with a long term artificial flood program at the Spöl river in Switzerland including time for discussions.

  • Start: 08:30 Interlaken
  • End (approx): 15:45 Fribourg, 16:30 Bern, 17:30 Interlaken

Photo: ZHAW School of Engineering

 

Excursion 3: Sediment management at Spiez hydropower plant and river widenings at the Simme and Kander flood plains (Canton Bern)

The rivers Simme and Kander are the big valley rivers of the western Berner Oberland. The morphological situation varies from channelized to natural, and parts of the rivers are used from hydropower with effects on hydrology and sediment management. In the excursion the measurements for an improvement of the sediment management (already 5 years going on) are presented and discussed as well as the ecological aspects of residual flow, artificial flow regime, floodplain ecology, lake trout and fish migration.

  • Start: 08:30 Interlaken
  • End (approx): 13:00 Spiez, 13:30 Interlaken

Photos: Dr. Steffen Schweizer