D’Olive Creek Stream Restorationconference.ifas.ufl.edu/NCER2016/presentations/8_1440... ·...
Transcript of D’Olive Creek Stream Restorationconference.ifas.ufl.edu/NCER2016/presentations/8_1440... ·...
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D’Olive Creek Stream RestorationDauphin Island Sea Lab
Mobile Bay National Estuary Program
Goodwyn, Mills, and Cawood, Inc.
Justin N. Barrett, PE
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OutlineProject Location
Former Conditions
Current Conditions
Project Objectives
Project Constraints
Geomorphic Assessment
Stream Stability Assessment
Hydrology Assessment
Conceptual Design
Design Approach
Design Iterations
Modeling
Optimization
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Project Location
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Former Conditions
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Current Conditions
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Project ObjectivesObjective #1: Design a self-sustaining, natural, stable stream
Objective #2: Reduce erosion and sediment supply through the reach
Objective #3: Design a stream and floodplain to handle design applied shear stresses without excess erosion or floodplain scour
Objective #4: Improve the riparian buffer functions of stability, habitat, and aesthetics
Objective #5: Maintain the integrity and function of the culverts at I-10 and work in conjunction with the ALDOT design for a stilling basin
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Project Constraints• Upstream and Downstream
Culvert Grade Control
• Valley Topography
• Private Property
• Utilities
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Design ApproachNatural Channel Design
• Mini Regional Curve Development
• Watershed and Stream Stability Assessment
• Conceptual Design
• Preliminary Design
• Modeling
• Optimization
• Final Design
• Stability and Enhancement Structures
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Mini Regional Curve DevelopmentLocation Channel
Classification
Drainage area (mi2)
Bankfull Width
(ft)
Bankfull depth
(ft)
Bankfull cross-
sectional area (ft2)
W/D Ratio
D'Olive - South of US 90 (XS1) E5 2.415 15.5 2 31.4 7.8
D'Olive - North of I-10 East Branch (XS2) E5 1.533 14 2.4 33.4 5.8
D'Olive - North of I-10 East Branch E5 1.533 16 1.9 29.6 8.4
P'Olive - North of I-10 West Branch E5 0.554 12 1.6 19.1 7.5
D'Olive - South of D'Olive Ridge Rd (East Trib XS1) E5 0.57 13 1.4 18.1 9.3
D'Olive - South of D'Olive Ridge Rd (East Trib XS2) E5 0.57 7.5 1.7 12.7 4.4
W'Olive - South of D'Olive Ridge Rd (West Trib) E5 0.348 10 0.97 9.7 10.3
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Mini Regional Curve Development
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Stream Stability Assessment• Meander Patterns
• Depositional Features
• Degree of Incision
• Width to Depth Ratio State
• Degree of Confinement
• Stream Succession Stage Shifts
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Stream Stability Assessment
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Stream Stability AssessmentReach:
Date:
Various Meander Pattern variables modified from Galay et al. (1973)
List ALL CATEGORIES that APPLY M3 M4
Meander Patterns
D'Olive Creek
6/13/2015Observers:
Stream: D'Olive Creek - I-10 Project
DAB, MJG
M1 REGULAR MEANDERS
M2 TORTUOUS MEANDERS
M3 IRREGULAR MEANDERS
M4 TRUNCATED MEANDERS
M5 UNCONFINED MEANDER SCROLLS
M6 CONFINED MEANDER SCROLLS
M7 DISTORTED MEANDER LOOPS
M8 IRREGULAR MEANDERS with oxbows and oxbow cutoffs
Reach:
Date:
Depositional Patterns
D'Olive Creek
6/13/2015Observers:
Stream: D'Olive Creek - I-10 Project
DAB, MJG
Various Depositional Features modified from Galay et al. (1973)
List ALL CATEGORIES that APPLY B1 B2 B4
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Stream Stability Assessment
6.5 Bank-Height Ratio: 3.3
2
Degree of Channel Incision
Degree of Channel Incision Stability Rating Deeply Incised
Low Bank Height:
Max Bankfull Depth:
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
Bank
-Hei
ght R
atio
(BH
R)
Stability Rating
Degree of Channel Incision
Stable Slightly Incised Moderately Incised Deeply Incised
12.4 1.39
8.9
Existing Width/Depth Ratio:
Width/Depth Ratio State
Ratio of existing W/d to reference W/d:
Moderately UnstableWidth/Depth Ratio State Stability Rating
Reference Width/Depth Ratio:
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Stability Rating
Width/Depth Ratio Stability Ratings
Rat
io o
f w/d
ratio
to re
fere
nce
w/d
ratio
(In
crea
se r
elat
ive
to re
fere
nce
w/d
ratio
)R
atio
of w
/d ra
tio to
refe
renc
e w
/d ra
tio
(Dec
reas
e re
lativ
e to
ref
eren
ce w
/d r
atio
)
Only use "Decrease relative to reference w/d ratio" for incising channels (Bank-Height Ratio >1)(Worksheet 3-7)
Stable UnstableModerately Unstable Highly Unstable
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Stream Stability Assessment2.4 0.53
Reference Meander Width Ratio (MWRref): 4.5
Degree of Confinement
Degree of Confinement Stability Rating Slight Departure
Existing Meander Width Ratio (MWR): Ratio of MWR to MWRref:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Rat
io o
f MW
R to
MW
R re
f
Degree of Confinement Departure
Degree of Confinement Departure based on Meander Width Ratio ( MWR ) / Reference Condition ( MWRref )
Little or No Departure Slight Departure Moderate Departure High Departure
0.80 – 1.00
0.30 – 0.79
0.10 – 0.29
< 0.10
Stream: D'Olive Creek Stream Type: F5
Location: I-10 Valley Type: VIII
Observers: DAB, MJG Date: 04/13/2015
Stability Rating (Check Appropriate Rating)
Stream Type Stage Shifts (Figure 3-14)
Stream Type at potential, (C→E),
(Fb→B), (G→B), (F→Bc), (F→C), (D→C)
(E→C), (B→High W/d B), (C→High W/d C)
(Gc→F), (G→Fb), (F→D), (C→F)
(C→D), (A→G), (B→G), (D→G), (C→G), (E→G), (E→A)
Stable
Moderately Unstable
Unstable
Highly Unstable
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Stream Stability AssessmentStream:
Location:Observers:
(2) (4) (6) (8)
(1) (2) (3) (4)
(1) (3)
(2) (4) (6) (8)
(1) (2) (3) (4)
17
I-10
F5/C5
VIII
04/13/2015DAB, MJG
Stream Type:
Date:Valley Type:
D'Olive Creek - I-10 Project
Degree of Confinement (MWR / MWRref) (Worksheet 3-9)
Moderately Unstable
< 0.10.1 – 0.29
> 21
Overall Lateral Stability Category (use total points and check stability rating)
2> 0.8
< 0.006
M1, M3, M4
0.006 - 0.04
Selected Points (from
each row)Stable Moderately Unstable Unstable Highly
Unstable
80.041 - 0.07 > 0.07
4
2
1
> 1.6
M2, M5, M6, M7, M8
2
W/d Ratio State (Worksheet 3-8)
1.4 – 1.6< 1.2
4
Depositional Patterns (Worksheet 3-5)
Meander Patterns (Worksheet 3-4)
Streambank Erosion: Unit Rate (Tons/yr/ft) (Worksheet 3-13)
Total Points
Stable
Lateral Stability Category Point Range
Highly Unstable
B5, B6, B7
5
< 10 10 – 12 13 – 21
0.3 – 0.79
Unstable
Lateral stability criteria (choose one stability category for each criterion 1–5)
1
3
Lateral Stability Categories
B3B4, B8
1.2 – 1.4
B1, B2
Stream:
(2) (4) (6) (8)
(2) (4) (6) (8)
(2) (4) (6) (8)
(2) (4) (6) (8)
(1) (2) (3) (4)
30
04/13/2015
D'Olive Creek
Observers: DAB, MJGLocation: I-10
Stream Type: F5
Valley Type: VIII
1
2Sediment Capacity (2-D FESWMS)
Date:
Excess energy sufficient to increase load up to 50% of annual load
Slight excess energy: up to 10% increase above reference
Sediment Competence (2-D FESWMS)
Moderately Incised
Vertical Stability for Channel Incision/ Degradation (use total points and check stability rating)
Slightly Incised
Not Incised Slightly Incised
Vertical Stability Criteria (choose one stability category for each criterion 1–5)
3
4
Degree of Channel Incision (BHR) (Worksheet 3-7)
Vertical Stability Categories for Channel Incision / Degradation
12 – 18 19 – 27 > 27
Degradation
0.10 – 0.29
Vertical Stability Category Point Range for Channel Incision / Degradation
< 12
Does not indicate excess capacity
Not Incised
Excess energy transporting more than 50% of annual load
Moderately Incised Degradation
Does not indicate excess competence
Trend to move larger sizes than D 100 of bar or > D84 of bed
D 100 of bed moved
Particles much larger than D 100
of bed moved
1.31 – 1.501.11 – 1.301.00 – 1.10 > 1.50
(B→G), (C→G), (E→G), (D→G), (A→G), (E→A)
If BHR > 1.1 and stream type has W/d less than 5
If BHR > 1.1 and stream type has W/d between 5–10
Does not indicate incision or degradation
Confinement (MWR / MWRref) (Worksheet 3-9)
Stream Succession States (Worksheets 3-16 and 3-7)
50.30 – 0.790.80 – 1.00
2
Total Points
< 0.10
8
4
8
8
Selected Points
(from each row)
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• Findings• Lateral Stability Unstable System
• Instream Depositional Features• Degree of Confinement• Streambank Erosion Potential
• Vertical Stability Degraded System• Incised System• Upstream Head Cut• Instream Energy during High Flows
• Conclusion• Major Channel Realignment• Adjustment of Profile• Floodplain Access• Decreased Shear Stress• Reduce Bank Erosion• Decrease Velocities
Stream Stability Assessment
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Hydrology Assessment HYDRO ENGINEERING SOULTIONSA DIVISION OF TRIMBLE
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Conceptual Design
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Design Approach
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Design Approach
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Design Approach
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Preliminary Design (30%)
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HEC-RAS Modeling
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2-D Hydraulic Modeling30% Design 3750 cfs
HYDRO ENGINEERING SOULTIONSA DIVISION OF TRIMBLE
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Former Conditions
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Former Conditions HYDRO ENGINEERING SOULTIONSA DIVISION OF TRIMBLE
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60% Design
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2-D Hydraulic Modeling60% 3750 cfs
HYDRO ENGINEERING SOULTIONSA DIVISION OF TRIMBLE
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2-D Hydraulic Modeling60% 1680 cfs
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Culvert Outlet ModelingHYDRO ENGINEERING SOULTIONSA DIVISION OF TRIMBLE
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90% Design
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2-D Hydraulic Modeling90% Design 3750 cfs
HYDRO ENGINEERING SOULTIONSA DIVISION OF TRIMBLE
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2-D Hydraulic Modeling90% Design 1680 cfs
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2-D Hydraulic Modeling90% Design Bankfull Discharge
HYDRO ENGINEERING SOULTIONSA DIVISION OF TRIMBLE
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Stability and Enhancement Structures
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Stability and Enhancement Structures