Quantifying the factors that influence flows in headwater ... · 0 1020 30 405060 0 204060 80 100...
Transcript of Quantifying the factors that influence flows in headwater ... · 0 1020 30 405060 0 204060 80 100...
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Quantifying the factors that influence flows in headwater
streams
By: Les Stanfield
Southern Science Information Section, Ministry of Natural Resources
In a d
rought
year.
...
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Historical Perspective• 1930’s deforested landscape • Hurricane Hazel
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1980 -2000 Defining Productive Capacity in streams
• Habitat models (Bowlby and Roff (1986), Steedman (1988), Stoneman and Jones (2000), etc.
Correlate specific habitat features with fish biomass
Guides site specific mitigation..... But planning?
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Strategic Implementation (mid 80’s to present)
Rigorous application of the no-net- loss (net gain) policy on direct fish
habitat.....
Did I mention this is Les’s perspective.....
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Mid 90’s Watershed planning (requires a landscape perspective)
2006: Three papers Quantifying landscape influences on biophysical properties of streams
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Since 1995 a coalition of partners has been working to understand how disturbance influences stream health
(MNR, DFO, EC, MOE, TRCA, GRCA, CLOCA, HRCA, Michigan DNR, GLC, UofT, UofG)
Background
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Key findings
-6-4
-2
02
4
6
0 5 10 15 20
LDI
Fish
Can
onic
al A
xis
1
Strong threshold response in fish community to development
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LDI = ∑% area land cover type*LDI rating
LDI Ratings range from 0.0 for water to 0.9 for roads
18 land cover categories.....
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126,000 brook trout < 21% of historic range
Regression model for Brook Trout
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Take home message
1. Landscape models better predictors than instream habitat
2. Only 2-3% of residual variation from landscape models explained by competition, habitat or riparian condition
3. Catchment is the best predictor of stream conditions
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Protecting direct fish habitat may not be enough
Need to protect processes important to fisheries in areas currently not protected..... Headwaters
1. Hydrology (baseflow/peak flows)2. geomorphology3. Connectivity
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Factors that influence flows
• Baseflow Stanfield . L. W., B. Kilgour, K. Todd, S. Holysh A. Piggott and M. Baker. In press. Estimating Summer Low-flow in Streams in a Morainal Landscape
using Spatial Hydrologic Models. Canadian Water Resources Journal.
• Peak flowsStanfield, L. W. 2009. Understanding the factors that influence headwater stream flows in response to storm events. University of Toronto, Masters Thesis. 75 pp
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0
200
400
600
800
1,000
1,200
1,400
1,600
0 1,000,000 2,000,000 3,000,000 4,000,000
BFI*Area
Sta
ndar
d Lo
w F
low r2 = 0.81
0
200
400
600
800
1,000
1,200
1,400
0 500 1,000 1,500 2,000 2,500 3,000 3,500
MODFLOW-modified
Stan
dard
ized
Low
Flo
w r2 = 0.89
0
200
400
600
800
1,000
1,200
1,400
1,600
0 1 2 3 4
MODFLOW
Sta
ndar
d Lo
w F
low
r2 = 0.83
0200400600800
1,0001,2001,4001,6001,800
0 300,000,000 600,000,000 900,000,000
Area (m2)
Stan
dard
ized
Low
Flo
w r2 = 0.79
0
200
400
600
800
1,000
1,200
1,400
0 500,000 1,000,000 1,500,000 2,000,000 2,500,000
POS_B_SUM
Stan
dard
ized
Low
Flo
w
r2 = 0.76
Poor correlationin small catchments
Minimum size for a permanent
flowing stream17,800 ha!
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Check your watershed day
Volunteer agency collaboration
Baseflow at most road Crossings
Inventory perched culverts!
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Hypothesis Generation
Study Area Determination/ Site Selection
Data Collection
MeasureStage Response
Estimate VelocityMeasure Wetted Area
of ResponseCalculate Event
Discharge
MeasureRainfall
Attribute Catchment Geology/land cover/slope
Interpolate Mean Catchment rainfall
Summarize Catchment attributes
Correlations(bi-plots, RDA)
Technique Validation
Peak flow Methods
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North-south land use/land cover gradient.....
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Measuring stream response
Crest Stage Gauges and Manning’s equatio
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Estimating Q: (Area*Velocity)
• Area good...• Manning’s needs
validation
Manning’s Equation..... V =1/n*R2/3*S1/2
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Defining and Attributing site catchments
• Arc-Hydro define catchments• GIS used to attribute
– Geology (Quaternary)– Land use/land cover (SOLRIS) (LDI)– Slope (valley)
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Rain event• Volunteer and agency network to
measure rainfall in each catchment • Extract maximum value for period
between sampling (12 events) and rainfall 2 days prior (rb)
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110
Select sites at furthest upstream accessible area, contrast in geology and land use
Rain gauge network (volunteer and agency)
1811
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Results
The search for patterns…..
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Standardized for each catchment per day(Q*sec/day/catchment area)
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0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
15 ,148 ^
HAR1_03LDI = 0.72 and BFI = 0.15
0 10 20 30 40 50 600
2040
6080
100
rain mm
disc
harg
e m
m
3 ,139 ^11, 150 ^
HAR1_04LDI = 0.73 and BFI = 0.15
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
HAR2_01LDI = 0.57 and BFI = 0.19
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
D-006LDI = 0.17 and BFI = 0.25
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
DA18-17LDI = 0.28 and BFI = 0.23
0 10 20 30 40 50 60
020
4060
8010
0rain mm
disc
harg
e m
m
GAN18-3LDI = 0.34 and BFI = 0.16
Poorly drained soils.....
consistently higher response in highest development areas,
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0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
A01_01LDI = 0.75 and BFI = 0.4
2 ,106^3 ,112 ^
0 10 20 30 40 50 600
2040
6080
100
rain mm
disc
harg
e m
m
A04_15LDI = 0.38 and BFI = 0.35
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
A04_14LDI = 0.33 and BFI = 0.35
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
GAN6-10LDI = 0.04 and BFI = 0.35
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
D-026LDI = 0.07 and BFI = 0.35
0 10 20 30 40 50 60
020
4060
8010
0rain mm
disc
harg
e m
m
D-027LDI = 0.1 and BFI = 0.35
Moderately well drained soils
High response if really high LDI,.... the rest not perfect!
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0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
GAN20-7LDI = 0.8 and BFI = 0.69
0 10 20 30 40 50 60
020
4060
8010
0rain mm
disc
harg
e m
m
GLENHOLMLDI = 0.66 and BFI = 0.69
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
DA18_hydLDI = 0.7 and BFI = 0.69
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
GAN3-11LDI = 0.03 and BFI = 0.71
0 10 20 30 40 50 60
020
4060
8010
0
rain mm
disc
harg
e m
m
GAN4-17LDI = 0.04 and BFI = 0.71
0 10 20 30 40 50 60
020
4060
8010
0
rain mmdi
scha
rge
mm
GAN3-8LDI = 0.04 and BFI = 0.71
Well drained soils
Poor response in all catchments.... geology rules
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Redundancy and Partial Redundancy Analysis
• Used to quantify patterns and evaluate significance
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water
tile
PoorModerate
Well
Slope
LDI
rb12
rb11
rb7rn12
rn11
rn8
rn7
-0.600
-0.400
-0.200
0.000
0.200
0.400
0.600
0.800
1.000
-1.000 -0.800 -0.600 -0.400 -0.200 0.000 0.200 0.400 0.600
PCA 1
PCA
2
dis7
dis8
dis12
dis11
1. Higher poor and well drained soils and LDI > higher discharge2. Higher rain and moderate drained soils > lower discharge3. Discharge scores very similar
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Partial RDA
P=0.02
P=0.002
P=0.33
Both Land use and Geology affect discharges.. Rain is not important.... Too messy!
Residual R2=0.76!
a= -0.03
Geology and slopeall rainfalld= -0.01`
g= 0.01
f= 0.05
b= 0.11
c= 0.11
LDI
e= -0.03
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Conclusions
• Geology and land use are both important..... but lots of variability
• Responses in drought years are not highly correlated with rainfall
- soil moisture - crop condition ?
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Implications for “Planning”1. Headwater systems can generate large volumes of
storm water2. Existing predictive models (means) will not protect
headwater stream low or peak flow conditions .... and biota!
3. Most vulnerable areas to change is likely poorly drained soils.... Where development is concentrated or planned!
4. At present cannot predict specific impacts to flows from land use with the possible exception of poorly drained soils
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Implications for monitoring
• Crest Stage approaches work well for broad scale studies – need to validate Manning’s n
• Existing rain gauge network is inadequate• Need to invest in both low flow and peak
flow monitoring programs.... Can’t rely on predictive models!
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CLIMATE CHANGE!Spec
ies
at R
isk!
U.S. supreme court decision to protect headwater systems under Endangered species Act.
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Implications for monitoring
• Crest Stage approaches work well for broad scale studies – need to validate Manning’s n
• Existing rain gauge network is inadequate
• Need to invest in both low flow and peak flow monitoring programs.... Can’t rely on predictive models!
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Acknowledgements• Laura Del Giudice, Scott Jarive (TRCA)• Jeff McNeice, Ian Kelsey(CLOCA)• Pam Lancaster (GRCA)• Oak Ridge Moraine Foundation• Toronto Region Conservation
Authority (Laura DelGuidice, S. Jarvie)• Ministry of Natural Resources
(esp. Silvia Strobl, Will Johnson, SSIS)• Lake Ontario Modeling Team• Ministry of Environment• Ontario Ministry of Agriculture/Food
• Grand River Conservation Authority (Graham Smith)
Sarah Ross, Mike Berenz, Amie Cousins and Kristina Abengoza