environmental monitoring of la grande 2 a and la grande 1 projects l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Environmental Monitoring of La Grande-2-A and La Grande-1 Projects PowerPoint Presentation
Download Presentation
Environmental Monitoring of La Grande-2-A and La Grande-1 Projects

Loading in 2 Seconds...

play fullscreen
1 / 25

Environmental Monitoring of La Grande-2-A and La Grande-1 Projects - PowerPoint PPT Presentation


  • 231 Views
  • Uploaded on

Environmental Monitoring of La Grande-2-A and La Grande-1 Projects. Danielle Messier McGill University, 2003-09-25. La Grande Complex. Context of the monitoring. Required by the certificates of authorization of projects constructed during phase II of the La Grande Complex

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Environmental Monitoring of La Grande-2-A and La Grande-1 Projects' - paul2


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
environmental monitoring of la grande 2 a and la grande 1 projects

Environmental Monitoring of La Grande-2-A and La Grande-1 Projects

Danielle Messier

McGill University, 2003-09-25

context of the monitoring
Context of the monitoring
  • Required by the certificates of authorization of projects constructed during phase II of the La Grande Complex
  • Section 22 of the James Bay and Northern Québec Agreement (1975)
the projects on the grande rivi re
The projects on the Grande Rivière
  • Addition of La Grande-2A underground generating station beside Robert-Bourassa's (PK 112)
  • Construction of La Grande-1 run-of-river generating station (PK 37)
sources of modifications
Sources of modifications
  • Increase of the designed flow from 4300 m3/s to 5920 m3/s
    • Changes in the production pattern: increase flow in winter time, decrease in summer time
  • Creation of La Grande-1 reservoir
    • Area of 70 km2
  • Operation of La Grande-1 generating station
objectives of the monitoring
Objectives of the monitoring
  • To verify the actual modifications of the environment following impact assessment study
  • To detect unpredicted impacts and take action to avoid or mitigate them
  • To enhance impact assessment and mitigation measures
criteria used for the monitoring
Criteria used for the monitoring
  • Components of the monitoring program must reflect the changes
  • Changes must be measurable
  • Methods must be accepted
  • Changes must be beyond natural variability
components of the monitoring
Components of the monitoring
  • Hydrology
    • discharge, water level, temperature, current
  • Erosion of river banks
  • Water quality
  • Riparian and aquatic vegetation
  • Fish
  • Mercury in fish
  • Underice freshwater plume
  • Eelgrass
main periods of the monitoring
Main periods of the monitoring
  • Reference period : 1985-1990
  • Transitory period : 1991-1992
  • Monitoring period : 1992-2000
river banks erosion13
River banks erosion
  • The Grande Rivière is enlarging to adapt to increased mean annual discharge
  • 3 large landslides occurred :
    • 3.5 M m3 in 1987
    • 1.5 M m3 in 1989
    • > 1 M m3 in 2003
fish communities
Fish Communities
  • Few changes in the fish communities of La Grande-1 reservoir and estuary
  • No transfer of fish between Grande Rivière and other tributaries of James Bay
mercury in fish
Mercury in fish
  • Impoundment of La Grande-1 reservoir did not change mercury concentrations in fish
  • The effect of the Grande Rivière on James Bay fish is restricted to the summer plume area
the freshwater underice plume
The freshwater underice plume
  • Increasing the discharge from 1700 m3/s to more than 4400 m3/s extends the plume area from 1600 km2 to 2100 km2 or 3500 km2, depending on ice conditions
eelgrass in james bay
Eelgrass in James Bay
  • General distribution of eelgrass beds in James Bay shows high stability from 1986-87 up to 1996
  • Massive decline in 1998-1999 along James and Hudson Bays, due to wasting disease
production of eelgrass
Production of eelgrass
  • Data from 1988 to 2000
  • High annual variation at all stations and all depths
  • Meterological conditions are responsible for annual variations
  • Isostatic uplift causes long term disappearance in shallow waters
variation in salt marshes
Variation in salt marshes
  • 10 permanent stations from 1991 to 1999
  • Vegetation changes under isostatic uplift
  • Noticeable expanses of vegetation
conclusions
Conclusions
  • Most environmental changes in the Grande Rivière were observed during phase I
  • Commissioning of La Grande-2A and La Grande-1 generating stations did not generate cumulative effects
  • The main changes are direct hydrological conditions, including the increase of the freshwater underice plume