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Model Bathymetry Lake Travis: A Sinuous Reservoir

Model Bathymetry Lake Travis: A Sinuous Reservoir. Bridget Wadzuk March 29, 2001. Introduction. Reservoir Characteristics Models CE-QUAL-W2 (COE) 2-D Segmented bathymetry ELCOM (Hodges/UWA) 3-D Cartesian grid bathymetry. Taken from CE-QUAL-W2 V3 User’s Manual. Problem.

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Model Bathymetry Lake Travis: A Sinuous Reservoir

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  1. Model BathymetryLake Travis: A Sinuous Reservoir Bridget Wadzuk March 29, 2001

  2. Introduction • Reservoir Characteristics • Models • CE-QUAL-W2 (COE) • 2-D • Segmented bathymetry • ELCOM (Hodges/UWA) • 3-D • Cartesian grid bathymetry

  3. Taken from CE-QUAL-W2 V3 User’s Manual

  4. Problem • Bathymetry from ArcView – Cartesian grid (plan view) • Need to get into a format that is accepted by CE-QUAL-W2 (profile view) STRAIGHTENED BATHYMETRY

  5. Theory • Relation of physical and radial space • 1:1 correspondence • Radial lines • Arc lengths

  6. Easier Said… • Choosing a grid • Resolution over scale of Lake Travis • Approach using Matlab • Select points for centerline • Spline points to a smooth curve • Compute normal radial lines • Check for crossing of radial lines • Repeat process until no crossings • Use intervals for bathymetry

  7. Bathymetry (original)

  8. Centerline Points

  9. Radial Lines (1)

  10. Radial Lines (2) • Radius of Curvature, Ro • Channel Width,  • Normally, / Ro < 1 • Ignore curvilinear term in sinuous systems • Unacceptable, / Ro > 1 • Thalweg must be adjusted

  11. Radial Lines (3)

  12. Straightened Bathymetry

  13. Yet To Come • Change approach to a GIS method • Use a smaller, more concise area • Lake LBJ • Less computationally intensive

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