Download - Hec-Ras 2003
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HECHEC--RASRASversion 3.0.1version 3.0.1
HEC-RAS Download files:
HECHEC--RAS download filesRAS download files
Version 3.0.1 needed for ice jamsVersion 3.0.1 needed for ice jams
User's ManualUser's Manual
Hydraulic Reference ManualHydraulic Reference Manual
Applications GuideApplications Guide
Please note:Please note: these files, and future updates of the program andthese files, and future updates of the program and
documentation, can be freely downloaded from the HEC website:documentation, can be freely downloaded from the HEC website:
http://www.hec.usace.army.mil/software/software_distrib/hechttp://www.hec.usace.army.mil/software/software_distrib/hec--ras/hecrasprogram.htmlras/hecrasprogram.html
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HEC-RAS Documentation:
UserUsers Manuals Manual for the beginnerfor the beginnerhow to get startedhow to get started
details of how to use HECdetails of how to use HEC--RAS (input, output, running)RAS (input, output, running)
Hydraulic Reference ManualHydraulic Reference Manual details of the equations, theories, assumptions, methodsdetails of the equations, theories, assumptions, methods
advice on how best to use HECadvice on how best to use HEC--RASRAS
details on differences between HECdetails on differences between HEC--RAS and HECRAS and HEC--22
Applications GuideApplications Guide example applications, stepexample applications, step--byby--stepstep
Introduction to HECIntroduction to HEC--RASRAS
Overview of HECOverview of HEC--RASRAS
Interface and output featuresInterface and output features
Modelling Ice CoversModelling Ice Covers
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HEC RAS Version 3.0.1HEC RAS Version 3.0.1 (March 2001)(March 2001)
11
--D steady GVF calculationsD steady GVF calculations
Open waterOpen water
Simple ice coverSimple ice cover
Ice jamIce jam
11--D unsteady GVF calculationsD unsteady GVF calculations
SubcriticalSubcritical flow onlyflow only
Sediment AnalysisSediment Analysis
Bridge scour (contraction and pier scour)Bridge scour (contraction and pier scour)
HECHEC--6 type6 type calcscalcs (coming later)(coming later)
11--D Steady Flow CalculationD Steady Flow Calculation
Flow regimesFlow regimes
SubcriticalSubcritical
SupercriticalSupercritical
MixedMixed
Basic solution procedureBasic solution procedureBased on the energy equationBased on the energy equation
Momentum equation used for special casesMomentum equation used for special cases
(e.g. RVF, mixed flow regimes, confluences,(e.g. RVF, mixed flow regimes, confluences,
bridges, hydraulic jumps)bridges, hydraulic jumps)
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Energy Equation
e
2
111
2
222 h
2g
VWS
2g
VWS ++=+
WSWS11 && WSWS22 = water surface elevations (= water surface elevations (WSWS == ZZ ++ YY))
VV11 && VV22 = average velocities= average velocities
11 && 22 = kinetic energy correction coefficients= kinetic energy correction coefficientsgg = gravitational acceleration= gravitational acceleration
hhee = head loss (due to friction & transitions)= head loss (due to friction & transitions)
HECHEC--RAS uses the Standard Step method proceeding inRAS uses the Standard Step method proceeding in
either the upstream direction (either the upstream direction (subcriticalsubcritical flow) or theflow) or the
downstream direction (supercritical flow).downstream direction (supercritical flow).
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Energy Losses
)2gV
2gVC(LSh
211222fe +=
LL = discharge weighted reach length= discharge weighted reach length
SSff= friction slope, averaged between the two= friction slope, averaged between the two
sectionssections
CC= contraction or expansion loss coefficient= contraction or expansion loss coefficient
Friction Slope,Friction Slope, SSff(Mannings Equation)(Mannings Equation)
2/13/21fSAR
nQ =
QQ = discharge for the section= discharge for the section
nn = Mannings resistance coefficient= Mannings resistance coefficient
AA = flow area= flow area
RR = hydraulic radius= hydraulic radius
SSff = friction slope= friction slope
S.I. version
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Introduction to HECIntroduction to HEC--RASRAS
Overview of HECOverview of HEC--RASRAS Interface and output featuresInterface and output features
Modelling Ice CoversModelling Ice Covers
To start the program,
double click on theHEC-RAS icon
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This opens HEC-RAS main window
HEC-RAS works with projects.
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Elements of a Project
Project File: filename.prj
Geometry Data
filename.g01
Steady Flow Data
filename.f01
Geometry Data
filename.g02
Plan 1
filename.p01
Plan 2
filename.p02
Run File 1
filename.r01
Run File 2
filename.r02
Output File 1
filename.o01
Output File 2
filename.o02
Geometry Data
Geometry data can beGeometry data can be
imported from bothimported from both
HECHEC--RASRAS ororHECHEC--22
file formats.file formats.
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Reach Layout Drawing
1. Add river1. Add river
reaches alongreaches along
with anywith any
junctions.junctions.
Use the reachUse the reach
drawing tool anddrawing tool and
double click todouble click to
end a reach.end a reach.
2. Add cross2. Add cross--
section names,section names,
elevationelevation--
station data,station data,
nn values, bankvalues, bankstations, reachstations, reach
lengths, losslengths, loss
coefficients,coefficients,
etc.etc.
Additional Geometry Data
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3. Add road,3. Add road,
bridge orbridge or
culvert dataculvert data
and/orand/or
weir orweir or
spillwayspillway
data.data.
Additional Geometry Data
View your cross section data...View your cross section data...
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Specifying the Flow Data
The most upstreamThe most upstream
cross section willcross section will
appear in the first row.appear in the first row.
Additional flowAdditional flow
change locations canchange locations canbe added at other crossbe added at other cross
sections within thesections within the
reach.reach.
Boundary Conditions
4 options
Choose a known water surface
elevation at d/s boundary.
Choose normal depth by providing the
assumed slope of the energy grade line.
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Steady Flow Computation
Then simply press compute!Then simply press compute!
Error messages will appear if there isError messages will appear if there is
inadequate geometry or flow information.inadequate geometry or flow information.
Viewing Results - Tabular
HEC-RAS provides
you with a variety of
default tables.
You can customize
and then save your
own table formats!
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Viewing Results - Graphical
Note observed water surface profileNote observed water surface profile -- used for calibration.used for calibration.
Adding an Observed Water Surface Profile
Select the river station from the pull down menu as illustrated
Then click on the Add an Obs. WS Location button.
Enter the observed water surface elevation for the station and
repeat the process (adding new stations for each water level) until
you have a complete observed water surface profile.
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Using tabular input for adjusting channel properties.
Highlight a group of cells for
the river stations of interest.
Make global changes to those cells (e.g. set them all to the same value).
Introduction to HECIntroduction to HEC--RASRAS
Overview of HECOverview of HEC--RASRAS
Interface and output featuresInterface and output features
Modelling Ice CoversModelling Ice Covers
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Modelling Ice Covers:
HECHEC--RASRAS has the ability to model simplehas the ability to model simple
ice covers and ice jams. (only version 3.0.1ice covers and ice jams. (only version 3.0.1
can model ice jams).can model ice jams).
Details of the various ice modelling methodsDetails of the various ice modelling methods
are covered in Chapter 11 of the Hydraulicare covered in Chapter 11 of the Hydraulic
Reference Manual.Reference Manual.
Details of how to enter ice data, how toDetails of how to enter ice data, how to
perform ice cover calculations, and how toperform ice cover calculations, and how toview ice profile results, are provided inview ice profile results, are provided in
Chapter 6 of the UserChapter 6 of the Users Manual.s Manual.
A simple ice cover is a continuous ice cover ofA simple ice cover is a continuous ice cover of
known thickness and roughness.known thickness and roughness.
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Clearwater River
(photo courtesy of Larry Garner, Alberta Environment)(photo courtesy of Larry Garner, Alberta Environment)
Ice JamIce Jam calcscalcs. solve for accumulation thickness. solve for accumulation thickness
Clearwater River
(photo courtesy of Larry Garner, Alberta Environment)(photo courtesy of Larry Garner, Alberta Environment)
Ice Jam TextureIce Jam Texture