dsd-int 2014 - delft3d users meeting - land building processes - uncertainties and insights on...
TRANSCRIPT
OPTIMIZING SEDIMENT CAPTURE AND DELIVERY
Ehab Meselhe, PhD, PE
Director of Natural Systems Modeling
INTEGRATING APPLIED RESEARCH. LINKING KNOWLEDGE TO ACTION.
BUILDING PARTNERSHIPS.
P R E S E N TAT I O N O V E R V I E W
Analysis/Validation of large scale dynamics
Application of large scale models
Analysis/validation of local riverine dynamics
Applications of local riverine dynamics
Analysis/validation of receiving area land building
Application of receiving area land building
G E O M O R P H I C A S S E S S M E N T
Document the historic trends of the channel system
Establish the current stability of the channel system and identify the dominant processes and features within the system
Acknowledgement: Little & Biedenharn
3
1 9 6 0 S T O 1 9 7 0 S
4
1 9 7 0 S T O 1 9 9 0 S
5
1 9 9 0 S T O 2 0 0 0 S
6
BUILDING STRONG®
Validation of large scale dynamics (Heath and Thomas)
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A P P L I C AT I O N O F L A R G E S C A L E M O D E L S : LONG TERM IMPACT OF MULTIPLE DIVERSIONS ON RIVER
BUILDING STRONG®
Future With Project (PR#2)
(Heath and Thomas)
Map from 2012 Coastal Master Plan
5,000 CFS
35,000 CFS
75,000 CFS 50,000 CFS
50,000 CFS
BUILDING STRONG®
(Heath and Thomas)
A N A LY S I S / V A L I D AT I O N O F L O C A L R I V E R I N E D Y N A M I C S : LOCAL RIVER RESPONSE TO LARGE DIVERSION
BUILDING STRONG®
Bathymetric change (FLOOD 2011)
(Sadid and Meselhe)
BUILDING STRONG®
Bathymetric change
(June 2011-June 2012)
BUILDING STRONG®
Volume of Erosion and Accretion
BUILDING STRONG®
2011 Flood Event-Sand Budget
29
%
17%
8%
2%
A P P L I C AT I O N S O F L O C A L R I V E R I N E D Y N A M I C S
BUILDING STRONG®
Impact of Diversion Design on Capture Efficiency (Gaweesh and Meselhe)
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BUILDING STRONG® 18
Invert Elevation
Alignment Angle
Size
Impact of
Diversion Design
on Capture
Efficiency
A N A LY S I S / V A L I D AT I O N O F R E C E I V I N G A R E A L A N D B U I L D I N G
W E S T B AY D I V E R S I O N
Acknowledgement: Meselhe, Allison, Khadka & Deltares
To West Bay (Receiving Basin)
2 0 0 9 - 2 0 1 1 V O L U M E S
2 0 0 9 - 2 0 1 1 L A N D B U I L D I N G ( ~ 3 K M 2 / 7 5 0 A C R E S )
A P P L I C AT I O N O F R E C E I V I N G A R E A L A N D B U I L D I N G
MID-BARATARIA LAND BUILDING ANALYSIS (WATER INSTITUTE AND HDR)
Alternatives:
75,000 CFS
50,000 CFS
35,000 CFS
25,000 CFS
C L O S I N G R E M A R K S
The synergy between Diversions and Dredging offers:
• Diversions: Sustainable solution
• Diversions: Significant new land building and preserve existing wetlands [fine material]
• Dredging/Placement: Near term land building
• Dredging/Placement: Reduced erosion
• Dredging/Placement: Enhanced sediment retention
• Combined: May reduce shoaling near the HOP
Impacts on Fisheries and Nutrients are being analyzed
THANK YOU
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