Analysis of Floodplain Fish Habitat on the San Joaquin for ... · Analysis of Floodplain Fish...
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Analysis of Floodplain Fish
Habitat on the San Joaquin for
the San Joaquin River
Restoration Project (SJRRP) Daniel Dombroski ([email protected]), Blair Greimann,
Elaina Gordon, Katrina Harrison (Reclamation)
Joe Mertz, Paul Bergman (Cramer Fish Sciences)
Mark Stone (Desert Research Institute)
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• Restore a self-sustaining Salmon fishery on the San
Joaquin River
• Minimize water supply impacts to Friant water users
SJRRP Project Objectives
SJRRP Project Actions
• Increase flows from Friant Dam
• Improve channel and control structures
• Reintroduce Chinook Salmon
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• Levee Setbacks in
Reaches 2B and
4B1
• Significant increase
or change in
vegetation in
Reaches 2A and 4A
• Approximately 150
miles in Project
Reach
SJRRP
Potential
Changes
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• How much more floodplain is necessary?
• How should the floodplain be designed?
• How will vegetation affect flood capacity?
SJRRP Project Questions
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How Much More Floodplain is
Necessary?
(Additional Required Habitat) =
(Required Habitat) – (Existing Habitat)
Estimated from ESHE:
Simulation of spring and
fall-run juvenile Chinook
Salmon
Estimated from SRH-2D:
Simulation of two-
dimensional depth
averaged hydraulic
conditions
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• Solves the depth-averaged Navier-Stokes
equations
• Produces two-dimensional (x,y) mean flow field
and water depth
• Bed shear stresses calculated via Manning’s
Resistance equation
• Apparent (Reynolds) stresses parameterized
using Boussinesq formulation and eddy viscosity
• Wetting-drying algorithm updated for each
solution time step
Available Habitat
Hydraulic Modeling: SRH-2D
Lai, J. Hydr. Eng., 2009
www.usbr.gov/pmts/sediment
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Build a model
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Example Calibration (Reach 2A)
Q = 7400 cfs
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Example Calibration (Reach 2A)
Q = 1000 cfs
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Hydraulic Modeling Results
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Objective:
Map simulated physical variables (e.g., depth and
velocity) to a quantitative metric of habitat quality for
a given species
Dependency:
Need a functional relationship between physical
variable and habitat quality based on field
observations
Habitat Assessment
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Habitat Suitability Index (HSI)
HSIT = total habitat suitability of the grid cell
HSID = depth habitat suitability of the grid cell
HSIV = velocity habitat suitability of the grid cell
HSIC = cover habitat suitability of the grid cell
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Depth and Velocity HSI
Chinook Salmon Juvenile Fall Run from Stanislaus
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0 1 2 3 4 5 6 7 8
Hab
itat
Su
itab
ility
In
de
x
Depth (ft), Velocity (ft/s)
Velocity HSI
Depth HSI
Aceituno (1990)
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Cover Habitat Suitability Index
HSIC score for each cover type
Assumed
HSI Value Cover Type Raleigh
1986
Sutton
2006
WDFW
2004
Hampton
1988
No Cover, River
Wash 0.01 N/A 0.1 0.1 0.07
Gravel Bars 0.25 0.3 N/A N/A 0.28
Grass, Herbaceous N/A 0.5 0.48 N/A 0.49
Willow Riparian and
Willow Scrub N/A 0.8 N/A N/A 0.80
Wetland/Marsh 0.3 0.6 1 0.5 0.60
Edge Habitat N/A N/A N/A N/A 1.00
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Cover Habitat Mapping
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Example HSI for
Reach 2A
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Available Suitable Habitat
Reach
Total
Inundated
(acres)
Available Suitable
Fraction Acres
1B 798 0.07 56
2A 743 0.14 104
3 770 0.08 62
4A 427 0.13 56
4B2 1041 0.27 281
5* 1373 0.27 371
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Necessary Suitable Habitat in
Reaches 2B and 4B1 to Overcome
Current Deficit
Reach Current Deficit of
Suitable Habitat
(acres)
2B 416
4B1 73
Divided river into upstream and downstream
reaches
Assumed upstream deficit could be met with Reach
2B and downstream deficit with Reach 4B1
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How to design floodplain habitat?
23 miles in Reach 4B1 and 13 miles in
Reach 2B will be vegetated and re-
contoured
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Analysis of Historical Photography
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How to design floodplain habitat?
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92
94
96
98
100
102
104
106
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
Ele
vati
on
(ft
)
Station (ft)
Section A
Existing
Modified
92
94
96
98
100
102
104
106
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
Ele
vati
on
(ft
)
Station (ft)
Section B
Existing
Modified
Example cross
sections in Reach 4B1
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Inundation modeling in Reach 4B1
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How will vegetation affect flood
capacity?
• Currently testing various strategies to
estimate vegetation roughness
• Desert Research Institute (DRI) collected
data in two example areas:
– average Leaf Area Index (LAI)
– average small & large stem diameter
– average density per unit ground area
– average height
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Methods to be tested in SRH-2D
hydraulic simulation:
• Kouwen N, Li RM. 1980. Biomechanics of vegetative
channel linings. Journal of the Hydraulics Division
106: 1085–1103.
• Fischenich JC. 2000. Resistance due to vegetation.
ERDC TN-EMRRP-SR-07. Engineer Research and
Development Center Vicksburg Mississippi.
• Järvelä J 2005. Effect of submerged flexible
vegetation on flow structure and resistance. Journal
of Hydrology 307: 233–241.
• Baptist MJ (2007). On inducing equations for
vegetation resistance. Journal of Hydraulic
Research, 45 (4): 435-450
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Summary
• Hydraulic modeling used to support:
– Computing area needed for floodplain
habitat
– Improving design of floodplain habitat
– Assessing impact of vegetation on
floodplain conveyance