March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple...
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Transcript of March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple...
![Page 1: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/1.jpg)
March 2003 HEC-RAS Version 3.1
Other Features of HEC-RAS- Other Features of HEC-RAS- part 2part 2
• Cross Section Interpolation
• Multiple Plans
• Supporting Pictures
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March 2003 HEC-RAS Version 3.1
Cross-Section Cross-Section InterpolationInterpolation
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March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross 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.
![Page 4: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/4.jpg)
March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross 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
![Page 5: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/5.jpg)
March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross Section Interpolation
![Page 6: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/6.jpg)
March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross Section InterpolationMaster Cords - 5 DefaultsMaster 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
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March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross Section InterpolationMaster CordsMaster Cords
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March 2003 HEC-RAS Version 3.1
Be Aware Of What The “Default” Be Aware Of What The “Default” Is DoingIs Doing
• User can establish more Master Chords to prevent mis-interpolations
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March 2003 HEC-RAS Version 3.1
Adding Master Chords to InterpolationAdding Master Chords to Interpolation
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March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross Section InterpolationMinor CordsMinor Cords
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March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross Section InterpolationMinor CordsMinor 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
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March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross Section InterpolationRoughness CoefficientsRoughness 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
![Page 13: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/13.jpg)
March 2003 HEC-RAS Version 3.1
Cross Section InterpolationCross Section InterpolationOtherOther
• 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
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March 2003 HEC-RAS Version 3.1
Multiple PlansMultiple Plans
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March 2003 HEC-RAS Version 3.1
HEC-RAS - Multiple PlansHEC-RAS - Multiple Plans
Suggested Suggested Reading:Reading:
Chapter 5 of HEC-Chapter 5 of HEC-RAS User’s ManualRAS User’s Manual
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March 2003 HEC-RAS Version 3.1
HEC-RAS - Multiple PlansHEC-RAS - Multiple Plans
Able to compare plans in tables:
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March 2003 HEC-RAS Version 3.1
HEC-RAS - Multiple PlansHEC-RAS - Multiple Plans
Able to compare plans in tables:
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March 2003 HEC-RAS Version 3.1
HEC-RAS - Multiple PlansHEC-RAS - Multiple Plans
Able to compare plans in tables:
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March 2003 HEC-RAS Version 3.1
HEC-RAS - Multiple PlansHEC-RAS - Multiple Plans
As well as in profiles, cross-sections, etc.:
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March 2003 HEC-RAS Version 3.1
Supporting PicturesSupporting Pictures
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March 2003 HEC-RAS Version 3.1
Supporting PicturesSupporting 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.
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March 2003 HEC-RAS Version 3.1
Example - Cross-SectionExample - Cross-Section
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March 2003 HEC-RAS Version 3.1
Example - Cross-SectionExample - Cross-Section
![Page 24: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/24.jpg)
March 2003 HEC-RAS Version 3.1
Example - River SchematicExample - River Schematic
![Page 25: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/25.jpg)
March 2003 HEC-RAS Version 3.1
Example - River SchematicExample - River Schematic
![Page 26: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/26.jpg)
March 2003 HEC-RAS Version 3.1
Example - River SchematicExample - River Schematic
![Page 27: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/27.jpg)
March 2003 HEC-RAS Version 3.1
Example - River SchematicExample - River Schematic
![Page 28: March 2003HEC-RAS Version 3.1 Other Features of HEC-RAS- part 2 Cross Section Interpolation Multiple Plans Supporting Pictures.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f255503460f94c3c673/html5/thumbnails/28.jpg)
March 2003 HEC-RAS Version 3.1
Log FilesLog 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.
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March 2003 HEC-RAS Version 3.1
Other OptionsOther 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:
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March 2003 HEC-RAS Version 3.1
Any Any Questions?Questions?