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Transcript of Assessing the impacts of Run-of-River Hydropower on ... · Coastal Tailed Frogs Breed in perennial...
![Page 1: Assessing the impacts of Run-of-River Hydropower on ... · Coastal Tailed Frogs Breed in perennial headwater streams Extended larval and juvenile stages Consistent overlap with ROR](https://reader030.fdocuments.us/reader030/viewer/2022041203/5d4eeab688c9935e578bc895/html5/thumbnails/1.jpg)
Interim FindingsJosh Malt, MSc, RPBio
Section Head, Terrestrial WildlifeForests, Lands, and Natural Resource Operations
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Project Interactions
AQUATIC TERRESTRIAL
Fish
Inverts
ASTR
PGS
HADU
NOGO
SPOW
• Water
Diversion
• Ramping
• Project
Footprints
• Indirect &
Temporary
EffectsGoats
Grizzly Bears
• Human
Activity &
Disturbance
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Coastal Tailed Frogs
Breed in perennial headwater streams
Extended larval and juvenile stages
Consistent overlap with ROR Hydropower
Sensitive to changes in instream conditions
Indicator species in fish-less streams
Special Concern (COSEWIC)
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Potential Impacts
Reduced aquatic habitat availability
Changed sedimentation patterns and
embeddedness
Changes to distribution of suitable substrate
Changes to temperature regime
Reduced population connectivity
Disturbance of riparian habitat
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Study Objectives
Link assessment and monitoring
Encourage consistent methods
Provide guidance to Statutory Decision Makers
Environmental risks
Significance of impacts
Provide guidance to proponents
Methods and Study Design
Avoidance & Mitigation Measures
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Guidance
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Outline
BACI Study Design
General results
Example at one operational facility
Buried Penstock Stream Crossings
Sediment & Biofilm
Temperature regimes & Thermal Performance
Conclusions & Next Steps
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Partners
SFU – Wendy Palen Lab
UBC – John Richardson Lab
Rylee Murray
Danielle Courcelles
FLNR Research Funding
Wind River
CDC-Laidlaw Power
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Map of facilities
9
SAKWI CR
KEENAN CR
HUNTER CR
E&W
WAHLEACH CR
TAMIHI CR
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Before-After Control-Impact
Design
Screen clipping taken: 2014-03-13, 12:21 PM
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Correcting for imperfect
detection Detectability is low
Detectability varies spatially and temporarily
Occupancy approach
Correction of detection bias
Estimates of ‘true’ abundance
N-mixture models: PCount in R
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Power Analysis
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Power Analysis
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BACI Sample Sizes To Date
14
2013 2014 2015 2016 2017
F ACILITY
Hunter East 4 5 4 5 4 5 4 5 4 5
Hunter West 5 5 5 5 5 5 5 5 5 5
Sakwi Tributary (Keenan Ck)
5 4 5 4 5 4 5 4 5 4
Sakwi Ck Mainstem
5 5 5 5 5 5 5 5 5 5
Tamihi Ck 5 5 5 5 5 5 6 5 6 5
Wahleach Ck 5 5 5 5 5 5 5 5 5 6
Total # Sites 29 29 29 29 29 29 29 29 29 29
Total # Site-Visits 87 87 87 87 87 87 87 87 87 87
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Top Models
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Abundance Model Detection Model AIC delta AICwt Cum. Wt
Elevation + Slope + Facility Cloud cover + Day of Year + Precipitation + Shade 3523.42 0 0.58 0.58
Elevation + Slope + Facility Cloud cover + Day of Year + Shade 3525.46 2.04 0.21 0.79
Elevation + Facility Cloud cover + Day of Year + Shade 3527.15 3.73 0.09 0.88
Elevation + Facility Cloud cover + Day of Year + Precipitation + Shade 3527.2 3.78 0.087 0.96
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Variable Effect Sizes
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Estimating Abundance
17
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BACI Example at one Facility
18
2013 2014 2015 2016 2017
F ACILITY
Hunter East 4 5 4 5 4 5 4 5 4 5
Hunter West 5 5 5 5 5 5 5 5 5 5
Sakwi Tributary (Keenan Ck)
5 4 5 4 5 4 5 4 5 4
Sakwi Ck Mainstem
5 5 5 5 5 5 5 5 5 5
Tamihi Ck 5 5 5 5 5 5 6 5 6 5
Wahleach Ck 5 5 5 5 5 5 5 5 5 6
Total # Sites 29 29 29 29 29 29 29 29 29 29
Total # Site-Visits 87 87 87 87 87 87 87 87 87 87
Linear Mixed Effects Model
Linear Mixed Effects Model on raw counts
Log(abundance) = Period + Treatment + Period*Treatment
(random effects = year + site + visit)
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BACI Results
19
F-value =
9.4
p = 0.002
F-value =
4.9
p = 0.4
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Biological Mechanisms
Reduced aquatic habitat availability
Changed sedimentation patterns and
embeddedness
Changes to distribution of suitable substrate
Changes to temperature regime
Reduced population connectivity
Disturbance of riparian habitat
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Biological Mechanisms
Reduced aquatic habitat availability
Changed sedimentation patterns and
embeddedness
Changes to distribution of suitable substrate
Changes to temperature regime
Reduced population connectivity
Disturbance of riparian habitat
![Page 22: Assessing the impacts of Run-of-River Hydropower on ... · Coastal Tailed Frogs Breed in perennial headwater streams Extended larval and juvenile stages Consistent overlap with ROR](https://reader030.fdocuments.us/reader030/viewer/2022041203/5d4eeab688c9935e578bc895/html5/thumbnails/22.jpg)
Buried Penstock Stream Crossings
• Direct Effect
• Unanticipated
Impact
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Penstock BACI Design
3 TCS Surveys
Before / After
CONTROL
IMPACT
DOWNSTREAM
IMPACT
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Interactions between sediment and
biofilm
Interactions between sediment and biofilm
Biofilm is key food source for herbivorous tadpoles
12 transects x 3 rocks x above/below weir x 4
streams
Analyzed Chlorophyll a and Ash-Free Dry Mass
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25
Interactions between sediment and
biofilm
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Assessing stream temperature regimes
5 data loggers May-October x above/below weir x 30
min sampling rate x 4 streams
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Distance from headwaters (km)
Diffe
rence
in
ave
rage
daily
tem
pera
ture
fro
m h
ea
dw
ate
rs (
°C
)
0 2 4 6 8 10
0
1
2
3
4
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Assessing resilience via Thermal
Performance
Acclimatize tadpoles to range of temperatures
Compare burst swimming speeds
Locomotive performance related to changes in
predation risk, foraging, fecundity, population
growth
Relationships between locomotion and
temperature
Thermal Performance Curves
Thermal performance optima, maxima, and safety
margins
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0 5 10 15 20 25 30
010
20
30
40
50
60
Temperature (°C)
Velo
city (
m/s
)
Temperature (°C)
Freq
uenc
y
5 10 15 20
050
100
150
200
250
300
Temperature (°C)
Freq
uenc
y
5 10 15 20
050
100
150
200
250
300
Temperature(oC)
Velocity(cm/s)
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Conclusions
Large differences between watersheds
Detectability affected by site, weather, and season
Impacts to stream connectivity could be important
Sediment and biofilm are interrelated
Hydropower operation could increase temperature,
not to detriment of performance
Completion of study required to improve clarity
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Next Steps
Continued Monitoring (5 years post-construction)
Building consistency in assessment & monitoring
Analysis & publication
MSc & PhD theses