floodplain mapping using av-ras esteban azagra and francisco olivera, ph.d. center for research in...
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![Page 1: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/1.jpg)
Floodplain Mapping Using AV-RAS
Esteban Azagra and Francisco Olivera, Ph.D.Center for Research in Water Resources
University of Texas at Austin
![Page 2: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/2.jpg)
Objective
• AV-RAS is a system of ArcView tools developed in Avenue -- the ArcView programming language -- that:
• extracts hydrologic data from digital terrain data, and
• maps the HEC-RAS results back on the digital spatial data
![Page 3: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/3.jpg)
Floodplain Mapping Approach
CRWR-PrePro AVRasWatersurfaceprofiles
ArcView
Geometricdata
ParametersSchematic
Flowdischarge
HEC-HMS HEC-RAS
![Page 4: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/4.jpg)
Digital Spatial Data
ArcView
HEC-RASHEC-HMS
• Digital spatial data required:
• Digital elevation model (DEM).
• Vector stream network.
• Land use / land cover
• Soils
![Page 5: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/5.jpg)
Streams and Watersheds
ArcView
HEC-RASHEC-HMS
• CRWR-PrePro is used for:
• Stream and watershed delineation.
• Determination of stream and watershed hydrologic parameters.
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HEC-HMS: Flow Determination
ArcView
HEC-RASHEC-HMS
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HMS-RAS ConnectionHMS Junctions RAS Cross-sections
ArcView
HEC-RASHEC-HMS
![Page 8: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/8.jpg)
HMS-RAS Connection
ArcView
HEC-RASHEC-HMS
(0500, 3559.6)
HMS Hydrograph
RAS Flow Data
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Digital Terrain Model: TIN
ArcView
HEC-RASHEC-HMS
• Observed points and breaklines for constructing a triangular irregular network (TIN).
![Page 10: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/10.jpg)
•TIN components:- nodes- edges- triangles
Digital Terrain Model: TIN
ArcView
HEC-RASHEC-HMS
![Page 11: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/11.jpg)
• 3D display of a TIN.
Digital Terrain Model: TIN
ArcView
HEC-RASHEC-HMS
![Page 12: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/12.jpg)
Digital Terrain Model: TIN
• Embedding Buildings into the TIN.
ArcView
HEC-RASHEC-HMS
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Cross Sections
• Stream centerline.• Banks.• Flow paths.• Cross sections.
ArcView
HEC-RASHEC-HMS
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• Bridges are not captured by the TIN: cross sections should NOT be defined at the bridges.
ArcView
HEC-RASHEC-HMS
Cross Sections
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Hydraulic Modeling with RAS
• RAS stream geometry.
• Cross-sections extracted from the TIN.
ArcView
HEC-RASHEC-HMS
![Page 16: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/16.jpg)
Hydraulic Modeling with RAS
• Water surface elevations.
ArcView
HEC-RASHEC-HMS
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Floodplain Mapping
ArcView
HEC-RASHEC-HMS
• Floodplain for 500 cfs.
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Floodplain Mapping
• 2-D floodplain animation (500 – 5,000 cfs).
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Floodplain Mapping
• 2-D representation of the Central Park detention pond.
![Page 20: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/20.jpg)
Floodplain Mapping
• 3-D floodplain animation.
![Page 21: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/21.jpg)
Limitations
• Bridge and culvert data has to be entered by hand.
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CS 9658
490
495
500
505
510
515
520
525
0 20 40 60 80 100 120 140 160
Distance along cross-section (ft)
Ele
vati
on a
bov
e M
LS
(ft
)
Field data
Data extracted from the TIN
Limitations
• The accuracy obtained from TIN data might not be good enough.
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Solutions
Source: digital representation of NYCgenerated by ASI and published by ESRI.
• New technologies (i.e. LADAR) are improving the quality of the digital terrain representations.
![Page 24: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/24.jpg)
Source: digital representation of NYCgenerated by ASI and published by ESRI.
Solutions
• New technologies (i.e. LADAR) are improving the quality of the digital terrain representations.
![Page 25: Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin](https://reader035.vdocuments.us/reader035/viewer/2022062714/56649d385503460f94a12375/html5/thumbnails/25.jpg)
Conclusions
• Automation of floodplain delineation results in time and resource savings.
• The lack of subjectivity provides standardized results.
• Applications include:• Design of control structures (detention
ponds, culverts, bridges, …).• Flood insurance rate determination.• Real-time flood emergency mapping.
• The accuracy of the digital terrain model has to be improved.
• Some field data will be still required.