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Flood Analysis of Scioto River Using HEC-RAS/GIS. Converting HEC-2 Data for HEC-RAS /ArcView GIS Analysis and Inundation Mapping (A pilot using Big Darby Creek ). 1873 flood of Athens. No Exact Record Available. 1907 flood - the highest known flood. - PowerPoint PPT Presentation
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Flood Analysis of Scioto River Using HEC-RAS/GIS
Converting HEC-2 Data for
HEC-RAS /ArcView GIS Analysis and Inundation Mapping
(A pilot using Big Darby Creek )
1873 flood of Athens1873 flood of Athens
No Exact Record Available
1907 flood - the highest known flood
The estimated peak discharge was 50,000 cfs
The Joseph Herrold Home Before and After the 1913 The Joseph Herrold Home Before and After the 1913 Flood Flood
Before... Before...
Joseph Herrold home after the flood of 1913Joseph Herrold home after the flood of 1913
Flood on March 11, 1964 Flood on March 11, 1964 - Ohio University, Athens - Ohio University, Athens
A height of 24.18 feet was recorded on the gage station
Pre-processing
• USGS 1:24,000 DLGs
• AVRas Pre-processing Function– TIN creation (temporary from DLGs)– Preparing required themes in ArcView GIS
• Bank lines
• Center line - require a line between banks
• Flow lines - direction of the flow
– X-sections digitized from surveying maps
Pre-processing (cont.)
• Digitizing provided X-sections using Arc/Info• Conversion to ArcView GIS• Labeling stations for X-sections
Pre-processing
• Creating the HEC-RAS import file (*.geo) using AVRas– Temporary TIN
– Center line
– Bank lines
– Flow lines
– X-Sections
41
39
38.5
3635
34
3331
292827
26
2524.8
2322
2120.4
1918
17
1514
13
11
109.7
8
•HEC-2 X-sections •Preprocessed X-sections
Geo-referenced X-sections
Importing GIS and HEC-2 Data
• Separately import GIS geometry file (*.geo) and HEC-2 data
• Adjust GIS geometry file according to HEC-2 data– Ground elevations
– X-section lengths
• Run an Avenue script to export X-sections into ArcView GIS– Program written by Nan Shi
– Generate two shapefiles - X-sections and elevation points
• Adjust new X-sections referencing streams in GIS
Cross-Section Cleaning
• Cross-sections lengths adjusted by HEC-2 data
• Position verified by USGS data
• Flow length verified by HEC-2 data
Digitized Adjusted
Final DEM Production
• Point elevation data (original HEC-2 data)
• Topographical elevation data (USGS data)
• New TIN created for flood plain delineation
New DEM
HEC-RAS
• Adding parameters– Manning’s‘n’ values– Ineffective flow areas– Bridges– Steady flow data
• Run water surface profile computations
• Model verification
Model Verification
Profile Output Table - Standard Table 1HEC-RAS Plan: trial1 River:Big Darby Reach: Big Dar by
# Rivers 1# Hydraulic Reaches = 1# River Stations = 152# Plans 1# Profiles 4
Reach River Sta Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft)
Big Darby 128466.2 8500 883 894.52 894.75 0.000541 4.27 2939.11 574.15 0.23Big Darby 128466.2 14100 883 897.24 897.5 0.000513 4.85 4546.13 606.28 0.24Big Darby 128466.2 16900 883 898.35 898.63 0.00051 5.1 5225.02 617.56 0.24Big Darby 128466.2 25300 883 901.11 901.45 0.000515 5.76 7020.72 678.71 0.25
Big Darby 127136.7 8500 882 893.65 893.97 0.000611 4.8 2350.87 823.1 0.25Big Darby 127136.7 14100 882 896.61 896.86 0.000441 4.76 4821.87 845.11 0.22Big Darby 127136.7 16900 882 897.78 898.01 0.0004 4.77 5810.92 853.76 0.21Big Darby 127136.7 25300 882 900.61 900.85 0.000351 5 8276.34 897.03 0.21
Big Darby 125026.9 9500 881 893.21 893.27 0.00018 2.74 4964.09 695.99 0.14Big Darby 125026.9 15800 881 896.15 896.24 0.00019 3.26 7078.01 743.25 0.15Big Darby 125026.9 19000 881 897.3 897.4 0.000199 3.5 7939.82 755.52 0.15Big Darby 125026.9 28400 881 900.1 900.24 0.000224 4.13 10103.78 875.96 0.17
Big Darby 124952.8 9500 880 892.99 887.24 893.23 0.000664 5.18 2675.37 293.83 0.26Big Darby 124952.8 15800 880 895.81 888.54 896.19 0.000783 6.47 3539.84 345.34 0.3Big Darby 124952.8 19000 880 896.89 889.6 897.34 0.000853 7.09 3936.01 384.84 0.31Big Darby 124952.8 28400 880 899.52 891.2 900.16 0.001023 8.59 5071.84 480.4 0.35
Big Darby 124940 Bridge
Big Darby 124863.5 9500 880 892.91 893.15 0.000615 4.85 2652.29 293.82 0.25Big Darby 124863.5 15800 880 895.7 896.09 0.000731 6.11 3484.59 327.95 0.29Big Darby 124863.5 19000 880 896.77 897.24 0.000801 6.71 3864.74 382.05 0.3Big Darby 124863.5 28400 880 899.37 900.04 0.000971 8.2 5078.62 646.05 0.34
Profile Output Table - Standar d Table 1HEC-RAS Plan: Imported Pla River: RIVER-1Reach: Rea ch-1
# Rivers 1# Hydraulic Reaches = 1# River Stations 153# Plans 1# Profiles 4
Reach River Sta Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft)
Reach-1 84 8500 882.5 894.19 894.43 0.000511 4.33 2848.65 570.49 0.23Reach-1 84 14100 882.5 896.84 897.12 0.000513 5 4400.28 601.59 0.24Reach-1 84 16900 882.5 897.94 898.25 0.000514 5.27 5072.79 614.58 0.24Reach-1 84 25300 882.5 900.73 901.09 0.000518 5.94 6864.65 671.91 0.25
Reach-1 83 8500 882 893.32 893.66 0.000656 4.76 2075.33 820.41 0.26Reach-1 83 14100 882 896.17 896.45 0.000497 4.86 4446.62 841.64 0.23Reach-1 83 16900 882 897.34 897.61 0.000443 4.85 5438.96 850.36 0.22Reach-1 83 25300 882 900.23 900.48 0.000373 5.02 7932.5 893.31 0.21
Reach-1 82.5 9500 881 892.75 892.84 0.000216 2.54 4662.96 690.22 0.14Reach-1 82.5 15800 881 895.59 895.71 0.000226 3.03 6683.21 734.42 0.15Reach-1 82.5 19000 881 896.76 896.89 0.000233 3.25 7549.42 749.77 0.15Reach-1 82.5 28400 881 899.63 899.8 0.000252 3.8 9743.03 780.35 0.16
Reach-1 82.4 9500 879.7 892.6 886.5 892.81 0.000636 3.62 2623.22 293.79 0.21Reach-1 82.4 15800 879.7 895.34 887.99 895.67 0.000749 4.61 3427.63 294.18 0.24Reach-1 82.4 19000 879.7 896.45 888.7 896.85 0.000813 5.06 3753.28 294.34 0.25Reach-1 82.4 28400 879.7 899.13 890.25 899.74 0.000996 6.25 4543.27 294.72 0.28
Reach-1 82.3 Bridge
Reach-1 82.2 9500 879.7 892.58 886.51 892.79 0.000745 3.63 2616.09 293.79 0.21Reach-1 82.2 15800 879.7 895.31 888.01 895.64 0.000875 4.62 3417.4 294.17 0.24Reach-1 82.2 19000 879.7 896.41 888.7 896.81 0.000948 5.08 3741.33 294.33 0.25Reach-1 82.2 28400 879.7 899.13 890.25 899.74 0.001147 6.25 4542.43 643.19 0.28
Original HEC-2 New HEC-RAS
Post-processing
• HEC-RAS export file
• AVRas post-processing
• Flood plain for 4 profiles– 17,800 cfs
– 30,800 cfs
– 38,000 cfs
– 58,000 cfs
Big Darby Flood Delineation
17,800 cfs - green
30,800 cfs - red
38,000 cfs - blue
58,000 cfs - purple
Adding AdditionalGeographic Information
17,800 cfs
Adding AdditionalGeographic Information
30,800 cfs
Adding AdditionalGeographic Information
38,000 cfs
Adding AdditionalGeographic Information
58,000 cfs