The performance of upstream and downstream passage facilities for diadromous fish species

Transcription

1 The performance of upstream and downstream passage facilities for diadromous fish species Olle Calles River Ecology & Management Karlstad University SWEDEN

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3 Swedish Downstream Passage Solutions 2007 Pre-2007: Fish killer racks = conventional fine-spaced trash racks without bypasses HAPPY FISH COURTESY OF

4 Swedish Downstream Passage Solutions 2008 DWA (2005) Post-2007: Inclined racks = low-sloping racks with bypasses HAPPY FISH COURTESY OF

5 Swedish Downstream Passage Solutions 2009 DWA (2005) Post-2007: Inclined racks = low-sloping racks with bypasses HAPPY FISH COURTESY OF

6 Swedish Downstream Passage Solutions 2016 Post-2007: Happy-boost = Various downstream FPS s with bypasses HAPPY FISH COURTESY OF

7 Swedish Downstream Passage Solutions 2016 New solution: Angled racks = low-sloping angled rack with bypass HAPPY FISH COURTESY OF

8 Swedish Downstream Passage Solutions 2016

9 Photo: Ingemar Alenäs The Herting Project The performance of upstream and downstream passage facilities for diadromous fish species 1 Olle Calles, 1 Daniel Nyqvist, 2 Jonas Christiansson, 3 Claudio Comoglio, 3 Paolo Vezza, 4 Ingemar Alenäs, 1 Simon Karlsson, 5 Marius Heiss & 6 Mats Hebrand 1 River management and ecology, Karlstad University (Sweden), 2 Elghagen fiskevård (Sweden), 3 Ditag, Politecnico di Torino (Italy), 4 Municipality of Falkenberg (Sweden) 5 Ludwig-Maximilians-Universität München (Germany), 6 Fiskevårdsteknik AB (Sweden)

10 The project goals Strengthen diadromous fish populations: Atlantic salmon European eel Sea lamprey with contrasting life-cycles and behavior Evaluation of Fish Passage Solutions, before and after modifications, by quantifying: Passage efficiency (rate) Fish Guidance Efficiency (FGE) Passage time (delay)

11 The project goals Strengthen diadromous fish populations: Atlantic salmon European eel Sea lamprey with contrasting life-cycles and behavior Evaluation, before and after modifications: OFE - Overall FPS Efficiency (cf. FGE) TPE Total Passage Efficiency (IPE) PT - Passage time (delay)

12 The River Ätran River Ätran Basics Catchment: 3342 km 2 Q range: m 3 s -1 MQ: 60 m 3 s -1

13 Connectivity in the River Ätran After 1906 Herting HEP 20 km

14 Herting HEP Before 2013 H2 Info Herting Falkenberg Energi Capacity: H1 = 40 m 3 /s H2 = 25 m 3 /s MQ = 60 m 3 /s 5.3 m head 3.3 MW 2.5 GWh / yr H1

15 Herting HEP 2013

16 Herting HEP After 2013 Q 11 m 3 /s

17 Herting HEP After 2013 H2 H1 Info Herting Capacity: H1 = 40 m 3 /s H2 = 25 m 3 /s MQ = 60 m 3 /s 4.65 m head (- 11%) 3.0 MW (+/- 0) 8.5 GWh / yr (-35%)

18 Downstream passage solution - Conventional rack Low-sloping rack Old conventional bar rack 1. Vertical steel bars - 90 mm 2. α = Surface bypass (2.0 cms) New angled bar rack 1. Horizontal composite bars - 15 mm 2. β = Full-depth bypass ( cms)

19 Before Pre-study Herting the Gateway to River Ätran After Evaluation

20 Methods Various trapping techniques Radio Telemetry 1) passage 2) control 3) dead-drifters 4) turbine releases Video counters

21 Study groups before & after 1. Spawners [ ] N = Kelt [ ] N = Smolt [ ] N = Elvers [ ] N = Silver eels [ ] N = Spawners [ ] N = 35

22 Laxsmolt [ ] OFE = 66% 21 days Salmon spawners [ ] Before

23 OFE = 96% (+50%) 4 days Salmon spawners [ ] After

24 Laxsmolt [ ] 48% (19 min) 335 kelts OFE = 83% TPE = 80% 52% (14 d) Salmon kelts [ ] Before

25 Salmon kelts [ ] Before Low discharge TPE (Survival) = 33 % Before High discharge TPE = 80 %

26 36% (22 min) 948 kelts OFE = 100% 64% (1.2 h) TPE = 96% Salmon kelts [ ] After

27 Salmon kelts [ ] Before Low discharge TPE = 33 % Before High discharge TPE = 80 % After Always high discharge TPE = 96 %

28 Laxsmolt [ ] 668 smolts OFE = 17% 40 eels OFE = 0% Salmon smolts TPE = 90% Silver eels TPE = 70% Salmon smolts & silver eels [ ] Before

29 44% (10 h) Salmon fry! 56% (10 h) smolts OFE = 85% * TPE = 91%* Salmon smolts [ ] After

30 39% OFE = 73% 61% (62 min) TPE = 97% Silver eels [ ] After

31 Long-term effects? N E W F P S

32 Long-term effects? N E W F P S

33 Herting Project Conclusions The new Herting fish passage facility: Follows the Swedish Best Practise, i.e.: Nature-like fishway = habitat and passage Low-sloping rack & bypass High passage success & low passage time, upstream and downstream = Hydro and diadromous fish can coexist!

34 WHAT S NEXT?

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36 Thanks for listening!