3.Richter_Data Extraction Using HEC

HEC-GeoRAS
Data Extraction
Andy Richter, P.E.
Hydrologic Engineering Center
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HEC-GeoRAS
Pre-processor for
generating geometric
for data exchange
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Post-processor for
mapping and
displaying results from
hydrualic simulations
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HEC-GeoRAS
Extension for ArcGIS
Requirements:
ArcGIS (ArcView license)
3D Analyst
Spatial Analyst
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HEC-GeoRAS
Installation of multiple components
ApFramework
XML Data Exchange Tools
HEC-GeoRAS application
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HEC-RAS Geometry
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River Network
XS Geometry
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RAS Geometry
Create data
Manage data
Attribute features
Generate RAS GIS
Import File (*.sdf)
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RAS Layers
Require Layers
Digital Terrain Model
(DTM)
Stream Centerline
Cross Section Cut Lines
Optional Layers
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Stream Banks
Flow Paths
Land Use
Bridges/Culverts
Ineffective Areas
Levee Alignments
Lateral Structures
Inline Structures
Storage Areas
Storage Area Connections
Contours, images,
orthophotos, (visualization)
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Digital Terrain Model
TIN or GRID
DTM of both the main
channel and the
adjacent overbank
floodplain areas
DTM used for:
Spatial referencing of
RAS Layers
Elevation extraction
Inundation mapping
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Digtial Terrain Models
TIN (points, edges)
Grid (cells)
50ft
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Background Data
Assist in stream
centerline and cross
section layout
Contours
Grids
Aerials
DRGs (quad sheets)
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Stream Centerline
Establishes the stream
network and connectivity
Created in the direction
of flow (from upstream to
downstream)
Each Reach must have a
unique River-Reach name
assigned
Tule Creek
Tributary
Baxter River
Lower Reach
Baxter River
Upper Reach
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Cross-Sectional Cut Lines
XS location are oriented
from the left to right bank
Perpendicular to flow
Elevations are extracted
from the DTM
River stations are assigned
to XS based on stationing
along the stream
centerline
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HydroID field!
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Cross-Sectional Cut Lines
Cross-sectional Cut Line
TIN
Resultant Cross Section
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Bank Lines
Stream bank lines are
located at the river banks
to delineate the main river
channel from the
overbanks areas
Bank locations are
assigned to the XS Cut
Lines as a fraction along
the cut
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0.69
0.65
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Flow Path Centerlines
Flow path lines are drawn at
the center-of-mass of flow in
the main channel, left
overbank, and right overbank
Created in the direction of
flow
Channel flowpath only is ok
Specify Left, Channel, Right
Downstream reach lengths
computed from as the
distance between XS Cut
Lines along Flow Paths
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Right
Left
Channel
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Land Use
Land use to represent
roughness characteristics
Needs an “N_Value”
field
N4
N1
N3
N2
Data must contain the
entire XS Cut Line
Extract associated
Manning’s n values at XS
Cut Lines
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Bridges/Culverts
Location of
bridge/culvert crossings
Extracts deck elevations
from DTM
Computes river station
User entered data:
Deck top width
Distance to U/S XS
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Ineffective Flow Areas
Identify non-conveying
areas
Locate visually in plan view
at bridges
Locations at XS Cut Lines
Trigger elevations
extracted at max terrain
elev. or user specified
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Blocked Obstructions
Identify areas that obstruct
flow in the floodplain
Locations at XS Cut Lines
Elevations for obstruction
extracted at max terrain
elev. or user specified
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Levees
Located at high ground
that prevents water from
flowing across floodplain
Extract levee elevations
from DTM or user-specified
Position and elevations
assigned to cut line
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Levees
Levee tool allows user
to specify levee
elevations
Interpolation between
specified values
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Inline Structures
Locate inline
structures just as
XS Cutline and
bridge at spillways
Extracts deck
elevations from DTM
Computes river station
User entered data:
Deck top width
Distance to US XS
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Lateral Structures
Location of lateral
overflow areas from main
channel
Create in direction of main
channel flow
Extracts weir profile and
river station at upstream
end of structure (user
must verify river station!)
User specifies weir width
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Storage Areas
Locate areas that will
store water during flood
Min/Max elevations
computed from SA
extents from DTM
Elevation-Volume
relationship is computed
from DTM for each SA
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Storage Area Connections
Identify locations that
connect storage areas
Extracts weir profile
from DTM
Computes upstream
and downstream
storage areas
User entered top
width
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Layer Setup
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Geometric Data Export
Data specified on the
Layer Setup is exported
Creates an ASCII file
for import into HEC-RAS
- “.RASImport.sdf”
Mutiple steps
Dump from GDB to Generic
XML (GIS2RASTemp.xml)
Conversion to “friendly” XML
(GIS2RAS.xml)
Conversion to SDF
(GIS2RAS.RASImport.sdf)
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Layers and Tables and Files, oh my!
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Process Summary
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