DA M B REA K MODEL ING WITH HEC-RAS a o n a am a e y Emmitsbur g, MD MD
r o g r am ec n c a
February 18, 2015 Vince Moody, P.E. Research Hydraulic Engineer
US Army Corps of Engineers Engineers
B UILDING STRONG STRONG®
em n ar
o. o.
Overview
Dam Breaching Options n re
o e
Cross Section for Reservoir Pool or Storage Area
eser servo r
oo ,
am,
ow
rea owns ream
Storage Area Pool, Hydraulic Conn, 2D Area below.
2D Pool, Hydraulic
onn, 2D Area downstream
Single 2D Area and Internal Hydraulic Structure for am
Performing the Computations
Pertinent Output 2
BUILDING BUIL DING STRONG STRONG®
Overview
Dam Breaching Options n re
o e
Cross Section for Reservoir Pool or Storage Area
eser servo r
oo ,
am,
ow
rea owns ream
Storage Area Pool, Hydraulic Conn, 2D Area below.
2D Pool, Hydraulic
onn, 2D Area downstream
Single 2D Area and Internal Hydraulic Structure for am
Performing the Computations
Pertinent Output 2
BUILDING BUIL DING STRONG STRONG®
Inline Structure Dam Break Control
3
BUILDING BUIL DING STRONG STRONG®
Dam Breach Data
4
BUILDING STRONG®
Non-Linear Breach Growth
Breach Regression Equation Calcula
Simplified Physical Breaching
1D Dam Breaching Analysis
Dam
1D Dam Breaching Analysis
Dam
1D River Reach Pool and 2D Downstrea
Dam
1D River Reach Pool and 2D Downstrea n ne Structure
Two XS Downstre
Animation 1D River Reach Pool and 2D
1D Storage Area Pool and 2D Downstrea
Dam
1D Storage Area Pool and 2D Downstrea
Dam
Animation of 1D Storage Area Pool and
2D Reservoir Pool and 2D Downstream
Dam
2D Reservoir Pool and 2D Downstream
Dam
Animation of 2D Reservoir Pool and 2D
Single 2D Flow Area with Internal Hydrau
Dam
Single 2D Flow Area with Internal Hydrau
Dam
Animation of Single 2D Flow Area with
Montecello Dam Breach Example
Montecello Dam Breach Example
Montecello Dam Breach Example
Hydraulic Structures Inside a of a 2D Are
Hydraulic Structure Computation Option
Example Levee Inside of a 2D Area
Performing the Computations
Important Computational Settings
Pertinent Output to Review
Hydrographs at Inline Structures, SA/2D Hydrau , Profile Plots for 1D Reaches
Inundation Maps/Animations in RAS-Mapper -
Velocity Time Series in RAS-Mapper
SA/2D Area Hydraulic Conn
1D River Reach W.S Profile Plots
Stage Hydrographs – RAS-Mapper
Velocity Time Series – RAS-Mapper
Instantaneous Dam/Levee Break
Equation set = Full Saint Venant Grid Size = 2 m X 2 m (36492 cells) Time step = 1.0 seconds ar ng oo ev = m . Starting Condition = Dry downstream Breach Time = Instantaneous
Theta = 0.8 to 1.0 Eddie Viscosity Coefficient = 0.35 Dimensions: 75 m X 2000 m ope = a Simulation Time Window = 30 minutes Computational Time = 3min 7 sec
