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Highlights of the 2-D Hydraulic Modeling of the San Joaquin River

Highlights of the 2-D Hydraulic Modeling of the San Joaquin River. San Joaquin River Restoration Program November 17, 2009 CSU Stanislaus, Turlock, CA. Purpose. 2D Hydraulics. Provides input for habitat evaluation Provides input for analysis of potential morphology responses.

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Highlights of the 2-D Hydraulic Modeling of the San Joaquin River

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  1. Highlights of the 2-D Hydraulic Modeling of the San Joaquin River San Joaquin River Restoration Program November 17, 2009 CSU Stanislaus, Turlock, CA

  2. Purpose 2D Hydraulics • Provides input for habitat evaluation • Provides input for analysis of potential morphology responses

  3. 2D Hydraulics • Why 2D? • Lateral and longitudinal flow patterns • Helps in the analysis of floodplain processes • More dependable local velocities and shear stresses for designs • Model Objectives • Provide high-resolution hydraulic information to help assessaquatic and riparian habitat conditions • increase understanding of the levee capacities and potential improvements to design

  4. 2D Hydraulics • Reclamation’s SRH-2D model (Lai, 2006) • Two-dimensional, depth-averaged model that simulates hydraulics • Model Progress • Reach 1A & 2B: preliminary model developed and calibrated • Reach 1B, 2A, & 4B: mesh developed; models require calibration

  5. 2D Hydraulics Input: • Topography & bathymetry obtained from hydrographic and photogrammetric surveys • Channel roughness polygons – (7 Zones) • Development of a computational mesh • Flow boundary conditions – Steady State

  6. 2D Hydraulics • Surface Development • Hydrographic and photogrammetric surveys • Final models will incorporate new LiDAR Example from Reach 2B

  7. Friant Computational Mesh(1A) • -> Structured main channel mesh • 10-20 ft laterally • 20-50 ft longitudinally • -> Unstructured floodplain • -> Control lines along major breaks: • Overbank points; • Drop structures; • Side channel entrances; Hwy 41

  8. Sample Mesh (2B) 2D Hydraulics 25–30 ft laterally 40–45 ft longitudinally Roughness Zones - Light blue = main channel - light green = light vegetation - dark green = heavy vegetation - gray = levee.

  9. Roughness Zones 2D Hydraulics

  10. 2D Hydraulics • Model Output: • Water Surface Elevation • Water Depth • Velocity (Vector & Magnitude) • Froude Number • Bed Shear – For sediment incipient motion analysis

  11. Sample Results1A-01 Approximately 1-mile

  12. Sample Results Depth (m) 2D Hydraulics 4500 cfs 350 cfs 1500 cfs Water Depth (m)

  13. Sample Results Velocity 2D Hydraulics 4500 cfs 350 cfs 1500 cfs 2500 cfs Velocity (m/s) Side Channel

  14. Example analysisHabitat 2D Hydraulics • Example Habitat Distribution using Froude Number Criteria: • Pools: 0.0 < Fr < 0.09 • Glides: 0.09 < Fr < 0.42 • Riffles: Fr > 0.42 • Based on (Hilldale & Mooney, 2007. Identifying Stream HabitatFeatures With a Two- Dimensional Hydraulic Model, USBR, Tech Series No. TS-YSS-12) where they found good correspondence between the Froude No. and the different habitat on the Yakima River in Washington.

  15. Froude Number Riffles 0.42 Glides 0.09 Pools Example Distribution of Pools, Glides, & Riffles 2D Hydraulics 1500 cfs 2500 cfs 350 cfs 4500 cfs

  16. Lateral Variability Across Channel 2D Hydraulics

  17. Example Results Reach 2B 2D Hydraulics • Depth and Velocity Distribution Plots • Quantify total areas within specified ranges • Useful for habitat suitability analyses

  18. Additional 2D Applications 2D Hydraulics • Vegetation: input for simulating establishment and mortality of riparian species • Provides input for analysis of sediment dynamics; bar formation and riffle erosion • Roughness: variability in lateral roughness based on vegetation and sediment dynamics • Levee Design: sensitivity studies for impacts of changing height or location, or both

  19. Thank You!!! 2D Hydraulics Questions???

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