Difference between revisions of "Gotein test case"

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{{Relevant SMTDs for Gotein}}
  
 
=Introduction=
 
=Introduction=

Revision as of 09:37, 21 January 2020

Fact box: Gotein
Country France
River Saison
Operator Société Hydroélectrique de Gotein
Capacity 0.32 MW
Head 5.81 m
Inter-annual discharge 22.3 m³/s
Turbine(s) 1 Kaplan turbine
Relevant solutions Applied in test case?
Baffle fishways -
Bypass combined with other solutions Yes
By-passing sediments -
Fish guidance structures with narrow bar spacing Yes
Fish refuge under hydropeaking conditions -
Fishways for eels and lampreys -
Mitigating reduced annual flow and low flow measures -
Operational measures (turbine operations, spillway passage) -
Other types of fine screens -
Sensory, behavioural barriers (electricity, light, sound, air-water curtains) -
Relevant MTDs Applied in test case?
3D sensorless, ultrasound fish tracking -
Acoustic Doppler current profiler (ADCP) -
Acoustic Doppler velocimetry (ADV) -
Acoustic telemetry -
Agent based model -
Barotrauma detection system -
BASEMENT -
CASiMiR -
Cassiopee Yes
Current meter Yes
Differential pressure sensor base artificial lateral line probe, iRon -
Fish Protection System (induced drift application) -
FLOW-3D -
HEC-RAS -
LiDAR -
OpenFOAM Yes
Particle image velocimetry (PIV) -
Radio frequency identification with passive integrated transponder (PIT tagging) Yes
Radio telemetry -
River2D -
Sediment simulation in intakes with Multiblock option (SSIIM) -
Shelter measurements -
Structure from motion (SfM) -
TELEMAC -

Introduction

The Test Case Gotein is located on the Saison in the southwest of France. The Saison has a total length of 54 km long and flows along the Pyrenees. Itis a tributary to Gave D’Oloron, which flows into the Adour river.

There are 3 hydropower plants (HPPs) and one fish farm on the Saison.

The hydrology of the Saison is characterized by sustained flows in winter, high water levels in spring due to snow melting and a low water period from August to October. At Gotein the mean interannual discharge is estimated at 22.3 m3/s.

About the hydropower plant

The HPP of Gotein is a run of river HPP with an installed capacity of 0.32 MW. It has a bypassed reach of 2.26 km. The turbine on site is a Kaplan turbine with a maximum turbined flow of 6.6 m3/s and a rated head of 5.81 m.

Layout

The Operator: File:Broken

Pressures on the water body's ecosystem

The hydrology of the Saison is highly altered by the hydropower plant of Sainte-Engrâce located more than 25 km upstream, which runs with hydropeaking. The continuity is altered by several weirs and HPPs along its course.

Test case topics

Fish population

The river is dominated by cyprinids and salmonids.

Downstream migration

An inclined bar rack (inclination 26°, bar spacing 20 mm) ist located infront of the HPP to protect the fish on their downstream migration. 5.4% of the turbine flow is allocated for downstream migration.

Upstream migration

At the dam, the fishes can use a pre-barrage fish pass to go upstream (2014). A flow of 1 m3/s is maintained in the pass. The pass has two pools of 38 and 45 m². It targets the fishes using the bypassed reach to go upstream.

At the powerplant, the fishes can use a baffle fishpass composed of 5 portions of 7.5 m with a 16% slope. The portions are connected by pools (3.0x2.0x1.0m). The flow in the fishpass is 150 l/s. There is a specific device for eels: it is composed of 4 portions, each 4 to 6 m long, with a 25 to 30 % slope. These are connected by resting pools (1.5x1.0x0.5m). The flow allocated to the fish pass is only a few liters per second. These devices target the fish using the tailrace channel to go upstream.

E-flow

In France, the law of 2006 (LEMA) imposes an e-flow of 1/10 of the mean inter-annual discharge before 1rst January 2014. They are two options for the environmental flow in the bypass section.

The first one is a minimum value equal to a tenth of the mean interannual discharge of the water course. It’s the value chosen in Gotein 2.5 m3/s.

The second one is a minimum biological flow value. It is calculated thanks to deep habitat studies. In the case of the value founded with the study is greater than the minimum value, it becomes the new minimum flow. If it’s smaller, the minimum flow stays equal to the tenth of the mean interannual discharge.

Research objectives and tasks

The test case site of Gotein is a small HPP with a fishfriendly water intake. For FIThydro, the efficiency of this water intake will be assessed. To assess the influence of the bypass and undertake modifications of the flow conditions, hydraulic modelling will be done for the entrance of the HPP.

Research tasks

The research task and field studies conducted at Gotein are:

  • Radiotelemetry fish tracking (Atlantic salmon smolts and silver eels) for the assessment of the bar rack efficiency

Results