March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.

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Presentation transcript:

March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures

March 2003HEC-RAS Version 3.1 Cross-Section Interpolation

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Sometimes it is necessary to supplement surveyed cross section data by interpolating new sections between two surveyed sections Typically needed when the change in velocity head is large. HECRAS detects this by comparing conveyance values between two sections.

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Geometric interpolation is accomplished by linearly interpolating between elevations and stations along “cords” 2 Options -  Interpolate a reach (more than 2 cross-sections)  Between 2 cross-sections

March 2003HEC-RAS Version 3.1 Cross Section Interpolation

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Master Cords - 5 Defaults  First coordinate of cross section  Left bank (required)  Minimum elevation point in main channel  Right bank (required)  Last coordinate of cross section

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Master Cords

March 2003HEC-RAS Version 3.1 Be Aware Of What The “Default” Is Doing User can establish more Master Chords to prevent mis-interpolations

March 2003HEC-RAS Version 3.1 Adding Master Chords to Interpolation

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Minor Cords

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Minor Cords Automatically generated by program Stations are determined using proportional distances between master cords Number of minor cords = sum of coordinates in bounding cross sections minus number of master cords

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Roughness Coefficients 4 default master cords (same as geometric minus the minimum channel elevation) Minor cords added at other locations if more than 3 ‘n’ values at either cross sect. Otherwise same as geometric interpolation

March 2003HEC-RAS Version 3.1 Cross Section Interpolation Other Other features which are interpolated: downstream reach lengths, main channel bank stations, contraction and expansion coefficients, normal ineffective flow areas, levees, and normal blocked obstructions Normal ineffective flow areas, levees, and normal blocked obstructions are interpolated only if both bounding cross sections have them. Can interpolate between 2 cross sections or entire reach

March 2003HEC-RAS Version 3.1 Multiple Plans

March 2003HEC-RAS Version 3.1 HEC-RAS - Multiple Plans Suggested Reading: Chapter 5 of HEC-RAS User’s Manual

March 2003HEC-RAS Version 3.1 HEC-RAS - Multiple Plans Able to compare plans in tables:

March 2003HEC-RAS Version 3.1 HEC-RAS - Multiple Plans Able to compare plans in tables:

March 2003HEC-RAS Version 3.1 HEC-RAS - Multiple Plans Able to compare plans in tables:

March 2003HEC-RAS Version 3.1 HEC-RAS - Multiple Plans As well as in profiles, cross- sections, etc.:

March 2003HEC-RAS Version 3.1 Supporting Pictures

March 2003HEC-RAS Version 3.1 Supporting Pictures  A picture can be “attached” to a cross section to help in documentation of the data.  A picture can also be “attached” to the river schematic to assist in documentation.

March 2003HEC-RAS Version 3.1 Example - Cross-Section

March 2003HEC-RAS Version 3.1 Example - Cross-Section

March 2003HEC-RAS Version 3.1 Example - River Schematic

March 2003HEC-RAS Version 3.1 Example - River Schematic

March 2003HEC-RAS Version 3.1 Example - River Schematic

March 2003HEC-RAS Version 3.1 Example - River Schematic

March 2003HEC-RAS Version 3.1 Log Files Program will write notes to a file as it performs the computations. 10 different levels of output. Files can get extremely large if higher levels are selected. Generally not necessary unless unusual answers are given by the program.

March 2003HEC-RAS Version 3.1 Other Options Scour at bridges Lateral weirs Ice-covered rivers Cross-Section points filter Fixed sediment elevations Pilot channels Setting ineffective flow areas to permanent There are other options not discussed in this presentation:

March 2003HEC-RAS Version 3.1 Any Questions?