Riverine Modeling Proof of Concept - Susitna-Watana Hydro€¦ · 4/15-17/2014 DRAFT – SUBJECT TO...
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4/15-17/2014 DRAFT – SUBJECT TO REVISION 1 Study 8.5 Technical Team Meeting Riverine Modeling Proof of Concept Version 2 – HEC-RAS Open-water Flow Routing Model April 15-17, 2014 Prepared by R2 Resource Consultants, Brailey Hydrologic, Geovera, Tetra Tech, and HDR
Transcript of Riverine Modeling Proof of Concept - Susitna-Watana Hydro€¦ · 4/15-17/2014 DRAFT – SUBJECT TO...
4/15-17/2014 DRAFT – SUBJECT TO REVISION 1 Study 8.5
Technical Team Meeting
Riverine Modeling Proof of Concept
Version 2 – HEC-RAS Open-water Flow
Routing Model
April 15-17, 2014
Prepared by R2 Resource Consultants, Brailey Hydrologic, Geovera, Tetra Tech, and HDR
4/15-17/2014 DRAFT – SUBJECT TO REVISION 2 Study 8.5
Open-water HEC-RAS Flow Routing Model – V2
4/15-17/2014 DRAFT – SUBJECT TO REVISION 3 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
• Improvements
– Coverage
• New Cross-sections – Middle and Lower River
• Extended Domain - Dam Site (PRM 187.2) to Susitna
Station (PRM 29.9)
• Floodplain coverage – XS extended with LiDAR
– Devils Canyon
» LiDAR + Estimated Channel
4/15-17/2014 DRAFT – SUBJECT TO REVISION 4 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
4/15-17/2014 DRAFT – SUBJECT TO REVISION 5 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
• Improvements
– Coverage • New Cross-sections – Middle and Lower River
• Extended Domain - Dam Site (PRM187.2) to Susitna Station
(PRM 29.9)
• Floodplain coverage – XS extended with LiDAR
– Devils Canyon
– Refined Calibration
• New XS rating curves and additional points for 2012
XS
4/15-17/2014 DRAFT – SUBJECT TO REVISION 6 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
Middle River Lower River
Refined Calibration
4/15-17/2014 DRAFT – SUBJECT TO REVISION 7 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
• Improvements
– Coverage • New Cross-sections – Middle and Lower River
• Extended Domain - Dam Site (PRM187.2) to Susitna Station
(PRM 29.9)
• Floodplain coverage – XS extended with LiDAR
– Devils Canyon
– Refined Calibration
– Synthesized Tributary Flows
• Hourly Accretion
• 61 year record
4/15-17/2014 DRAFT – SUBJECT TO REVISION 8 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
10,000
12,000
14,000
16,000
18,000
20,000
22,000
24,000
26,000
28,000
30,000
Ho
url
y F
low
(cf
s)Susitna River at Gold Creek Gage (PRM 140.0)
Simulated
USGS Measured
4/15-17/2014 DRAFT – SUBJECT TO REVISION 9 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
40,000
45,000
50,000
55,000
60,000
65,000
70,000
75,000
Ho
url
y F
low
(cf
s)Susitna River at Sunshine Gage (PRM 88.0)
Simulated
USGS Measured
4/15-17/2014 DRAFT – SUBJECT TO REVISION 10 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
90,000
95,000
100,000
105,000
110,000
115,000
120,000
125,000
130,000
135,000
Ho
url
y F
low
(cf
s)Susitna River at Susitna Station Gage (PRM 29.9)
Simulated
USGS Measured
4/15-17/2014 DRAFT – SUBJECT TO REVISION 11 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
• Outputs
– Hourly flow hydrographs of the Susitna River at any
location (including Focus Areas) between the proposed
dam site (PRM 187.2) and just downstream from the
Yentna River confluence (PRM 29.9).
– Hourly stage hydrographs of the Susitna River at
surveyed river cross-sections (total = 212).
4/15-17/2014 DRAFT – SUBJECT TO REVISION 12 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
Jul 1
, 197
5
Oct
1, 1
975
Jan
1, 1
976
Apr
1, 1
976
Jul 1
, 197
6
Oct
1, 1
976
Ho
url
y F
low
(cf
s)
0
20000
40000
60000 Existing Conditions
Scenario OS-1b
Susitna River at Dam Site
PRM 187.2
Dry Year - 1976
4/15-17/2014 DRAFT – SUBJECT TO REVISION 13 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
Jul 1
, 197
5
Oct
1, 1
975
Jan
1, 1
976
Apr
1, 1
976
Jul 1
, 197
6
Oct
1, 1
976
Ho
url
y F
low
(cf
s)
0
20000
40000
60000 Existing Conditions
Scenario OS-1b
Susitna River at FA-128
PRM 129.7
Dry Year - 1976
4/15-17/2014 DRAFT – SUBJECT TO REVISION 14 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
Jul 1
, 198
0
Oct
1, 1
980
Jan
1, 1
981
Apr
1, 1
981
Jul 1
, 198
1
Oct
1, 1
981
Ho
url
y F
low
(cf
s)
0
20000
40000
60000 Existing Conditions
Scenario OS-1b
Susitna River at Dam Site
PRM 187.2
Wet Year - 1981
4/15-17/2014 DRAFT – SUBJECT TO REVISION 15 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
Jul 1
, 198
0
Oct
1, 1
980
Jan
1, 1
981
Apr
1, 1
981
Jul 1
, 198
1
Oct
1, 1
981
Ho
url
y F
low
(cf
s)
0
20000
40000
60000 Existing Conditions
Scenario OS-1b
Susitna River at FA-128
PRM 129.7
Wet Year 1981
4/15-17/2014 DRAFT – SUBJECT TO REVISION 16 Study 8.5
HEC-RAS Open-water Flow Routing Model – V2
• Limitations
– Not applicable during ice covered conditions (October 28
through May 22)
– One-dimensional
– Devils Canyon bathymetry estimated
– No water surface elevations at locations in between
surveyed cross-sections.
• The 2D hydraulic model in the Focus Areas will rely on input from
the HEC-RAS Open-water Flow Routing Model to determine
water surface elevations in Focus Areas.
• Output from the HEC-RAS Open-water Flow Routing Model,
combined with LiDAR data, may be used to estimate areas of
inundation in riparian floodplain zones.
