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

2. Introduction Reservoir Characteristics Models CE-QUAL-W2 (COE)
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 Approach using Matlab
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