rc101 day 2 jennings 10
TRANSCRIPT
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Why Classify Streams?
• Communication Tool
• Describe Existing Conditions & Trends
• Describe Restoration Goals
• Research Tool
Stream Classification
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Morphologic Stream Classification Systems
• Schumm (1977)– Alluvial channels
– Meandering, straight, braided
– Type related to channel stability & sediment transport
• Montgomery & Buffington (1993)– Alluvial, colluvial, bedrock channels
– Channel response related to sediment inputs
– 6 classes of alluvial channels: cascade, step-pool, plane-bed, riffle-pool, regime, and braided
• Rosgen (1994)www.wildlandhydrology.com
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Rosgen Classification of Natural Rivers
• Based on physical characteristics (empirical)
• Requires field measurements
• Requires bankfull dimensions
www.wildlandhydrology.com
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What factors affect stream morphology?
• Width
• Depth
• Slope
• Velocity
• Discharge
• Flow resistance
• Sediment size
• Sediment load
Leopold et al (1964)
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Dimension (cross-section)
Pattern (plan form)
Profile (bed form)
Bed material (substrate)
Rosgen Classification of Natural Rivers
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Level 1 Rosgen Classification
www.wildlandhydrology.comwww.wildlandhydrology.com
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Level 2 Rosgen Classification
www.wildlandhydrology.comwww.wildlandhydrology.com
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Riffle Dimensions
Bankfull
Wbkf
Abkf
Measure Bankfull Width (Wbkf) and Bankfull Area (Abkf)
Mean Depth, dbkf = Abkf / Wbkf
Width to Depth Ratio, W/d = Wbkf / dbkf
dbkf
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W/d = 9.3 / 1.5 = 6.2
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Entrenchment Ratio
ER = Wfpa / Wbkf
Bankfull
2 x dmax
above thalweg
Wfpa
Wbkf
dmax
Wfpa = Width of Flood Prone Area measured at the
elevation twice bankfull max depth above thalweg
Wbkf = Width of Bankfull Channel
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ER = Wfpa / Wbkf = 63 / 15 = 4.2
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Bed Material (Substrate)
Silt/Clay: < 0.062 mm
Sand: 0.062 – 2 mm
Gravel: 2 – 64 mm
Cobble: 64 – 256 mm
Boulder: 256 – 2048 mm
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Substrate
Characterization
Wolman Pebble Count
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www.wildlandhydrology.com
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Valley Types: (www.epa.gov/watertrain/stream_class)
Valley Type II
Moderately steep, gentle sloping side
slopes often in colluvial valleys
From EPA Watershed Academy: Fundamentals of the Rosgen Stream Classification System
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Valley Types: (www.epa.gov/watertrain/stream_class)
Valley Type VIII
Wide, gentle valley slope with well-developed
floodplain adjacent to river terraces
From EPA Watershed Academy: Fundamentals of the Rosgen Stream Classification System
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www.wildlandhydrology.com
Stream Types in Landscape Positions
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A Streams
Incised, Narrow & Deep, Steep Slope
Colluvial Valley
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www.wildlandhydrology.com
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dbkf
Single Thread Channel
ER = Wfpa/Wbkf < 1.4
W/d = Wbkf/dbkf < 12
S > 0.04 ft/ft
A Stream Channel
Bankfull
dmax
Wfpa
Wbkf
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A2 Western NC
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A2 Montana
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A3 Western NC
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Aa+ Streams
Very Steep
(>0.1 ft/ft)
A1a+ Western NC
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A1a+ Western NC
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A1a+ Tennessee
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B Streams
Moderately Incised, Wide &
Shallow, Moderate Slope, Colluvial Valley
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dbkf
Single Thread Channel
ER = Wfpa/Wbkf = 1.4 – 2.2
W/d = Wbkf/dbkf > 12
S = 0.02 – 0.04 ft/ft
B Stream Channel
Bankfull
dmax
Wfpa
Wbkf
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www.wildlandhydrology.com
Stream Types in Landscape Positions
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www.wildlandhydrology.com
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B3 Western NC
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B3 Western NC
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B3 Western NC
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B4 Tennessee
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B3 Western NC
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B4 Western NC
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B4c Western NC
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C Streams
Not Incised, Wide & Shallow, Low Slope
Alluvial Valley
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dbkf
Single Thread Channel
ER = Wfpa/Wbkf > 2.2
W/d = Wbkf/dbkf > 12
S < 0.02 ft/ft
C Stream Channel
Bankfull
dmax
Wfpa
Wbkf
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www.wildlandhydrology.com
Stream Types in Landscape Positions
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www.wildlandhydrology.com
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C4 Western NC
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C4 Western NC
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C4 Washington
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C4 New Zealand
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C4 Western NC
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C5 Alabama
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C4 Utah
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C4 Western NC
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E Streams
Not Incised, Narrow & Deep, Low Slope
Alluvial Valley
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dbkf
Single Thread Channel
ER = Wfpa/Wbkf > 2.2
W/d = Wbkf/dbkf < 12
S < 0.02 ft/ft
E Stream Channel
Bankfull
dmax
Wfpa
Wbkf
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www.wildlandhydrology.com
Stream Types in Landscape Positions
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www.wildlandhydrology.com
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E4 Western NC
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E4 Central NC
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E4 Central NC
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E4 Western NC
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E4 Western NC
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E4b Western NC
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E4 Western NC
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E5 Central NC
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E4 Central NC
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E4 Western NC
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E4 Western NC
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E5 -> G5c AL
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G Streams
Incised
Narrow & Deep
Moderate Slope
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dbkf
Single Thread Channel
ER = Wfpa/Wbkf < 1.4
W/d = Wbkf/dbkf < 12
S = 0.02 – 0.04 ft/ft
G Stream Channel
Bankfull
dmax
Wfpa
Wbkf
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www.wildlandhydrology.com
Stream Types in Landscape Positions
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www.wildlandhydrology.com
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G4 Western NC
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G4 Eastern NC
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G5 Headcut
Georgia
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G5 Headcut
Georgia
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G4c Central NC
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G4c Alabama
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G4c Alabama
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G5c Eastern NC
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G5c Alabama
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G5c Florida
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G4
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2003
2000
2003
2001
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F Streams
Incised, Wide & Shallow, Low Slope
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dbkf
Single Thread Channel
ER = Wfpa/Wbkf < 1.4
W/d = Wbkf/dbkf > 12
S < 0.02 ft/ft
F Stream Channel
Bankfull
dmax
Wfpa
Wbkf
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www.wildlandhydrology.com
Stream Types in Landscape Positions
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www.wildlandhydrology.com
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F1 Asheville
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F2 New Zealand
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F2 New Zealand
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F3 New Zealand
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F4 Western NC
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F4 Texas
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F4 Texas
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F4 Alabama
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F5 Georgia
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F5 South Carolina
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Ugg Texas
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D & DA Streams
Multiple Channels, Wide & Shallow, Low Slope
D4 Virginia
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dbkf
Multiple Thread Channel
ER = Wfpa/Wbkf > 2.2
W/d = Wbkf/dbkf > 40
D Stream Channel
Bankfull
dmax
Wfpa
Wbkf
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www.wildlandhydrology.com
Stream Types in Landscape Positions
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www.wildlandhydrology.com
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D4 Georgia
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D4 New Zealand
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D4 Oregon
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D4 Pennsylvania
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C4 -> D4 Western NC
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C4 -> D4 Western NC
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DA5 Florida
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www.wildlandhydrology.com
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ER=11; W/d=16; S=0.004; D50=1 mm
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ER=1.3; W/d=7; S=0.007; D50=1.5 mm
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ER=2.2; W/d=14; S=0.024; D50=75 mm
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ER=1.5; W/d=10; S=0.009; D50=2 mm
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ER=4.5; W/d=14; S=0.033; D50=75 mm
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ER=3.4; W/d=13.2; S=0.012; D50=15 mm
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ER=6.5; W/d=10.5; S=0.008; D50=1.5 mm
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ER=10; W/d=9.5; S=0.005; D50=0.5 mm
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ER=1.5; W/d=10; S=0.009; D50=2 mm
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ER=1.4; W/d=10; S=0.050; D50=50 mm
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ER=1.3; W/d=15; S=0.002; D50=0.5 mm
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ER=1.3; W/d=7; S=0.007; D50=1.5 mm
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ER=5.5; W/d=29; S=0.009; D50=15 mm
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DA5 FloridaER=18; W/d=45; S=0.0002; D50=0.1 mm
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ER=2.2; W/d=14; S=0.035; D50=110 mm
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ER=5.5; W/d=8.2; S=0.025; D50=12 mm
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ER=2.1; W/d=15; S=0.065; D50=120 mm
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ER=2.2; W/d=14; S=0.024; D50=75 mm
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