Morphological Modeling of Inlets and Adjacent Shorelines on Engineering Timescales
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1 CB&I Morphological Modeling of Inlets and Adjacent Shorelines on Engineering Timescales Challenges and Model Improvements based on Recent Studies Dobrochinski, J.P.H.; Benedet, L.; Signorin, M.; Pierro, T. CB&I Coastal & Maritime Services, 2481 NW Boca Raton Blvd, Boca Raton, FL, A World of Solutions
2 Outline 1. Inlet systems overview 2. Project cases general description North Topsail Beach, NC Blind Pass (Lee County, FL) 3. Use of numerical models Hydrodynamic and wave calibration Morphology calibration Model application / production runs 4. Conclusions A World of Solutions 1
3 Inlets systems Complex systems Tidal currents Waves Alongshore current and sediment drift Sediment bypassing (complex sediment paths) Multiple grain sizes Channel and ebb shoal relocation Coastal erosion/accretion A World of Solutions 2
4 Inlets systems Complex systems Tidal currents Process affect each other (inter-relations) Waves Alongshore current and sediment drift Sediment bypassing (complex sediment paths) Multiple grain sizes Coastal erosion/accretion (influence of channel location/orientation and ebb shoal) A World of Solutions 3
5 Project cases description A World of Solutions 4
6 Study areas A World of Solutions 5
7 North Topsail, NC (New River Inlet) A World of Solutions 6
8 Study areas North Topsail, NC ICWW North ICWW South New River Inlet A World of Solutions 7
9 Study areas North Topsail, NC Apr 2013 ~550,000 cy Authorized channel limits A World of Solutions 8
10 Study areas North Topsail, NC Apr 2014 Authorized channel limits A World of Solutions 9
11 Study areas North Topsail, NC Oct 2015 Authorized channel limits A World of Solutions 10
12 Study areas North Topsail, NC April 2013 Measured Bathymetry April 2014 April 2015 A World of Solutions 11
13 Blind Pass, FL (Lee County) A World of Solutions 12
14 Study areas Blind Pass, FL Blind Pass, Lee County (FL) Boca Grande Pass Captiva Pass Redfish Pass Blind Pass San Carlos Bay A World of Solutions 13
15 Study areas Blind Pass, FL Blind Pass, Lee County (FL) Jun 2008 May 2002 Source: Captiva Erosion Prevention District A World of Solutions 14
16 Study areas Blind Pass, FL Blind Pass, Lee County (FL) ~150,000 cy A World of Solutions 15
17 Study areas Blind Pass, FL Blind Pass, Lee County (FL) A World of Solutions 16
18 Study areas - Summary Extremely dynamic and responsive environments challenging problems How to improve the situation, optimize project lifetime and expenses? alternate dredging layout, beach nourishment, hard structures, etc. (?) Support for decision making : a) Historical analysis of morphology changes b) Engineering analysis and sediment budgets c) Field surveys and measurements d) Numerical modeling e) Environmental resource mapping & impact assessments A World of Solutions 17
19 APPLICATIONS INPUTS Delft3D Overview General input Bathymetry, bed roughness, turbulence coefficients (viscosity) Boundary conditions Water levels, discharges / velocities, wind stress Delft3D-WAVE (Wind wave generation and propagation) State of the Art Morphology Modeling Delft3D-FLOW (3D currents, water levels) Morphology update Transport of Constituents (salinity, temperature, tracer, etc.) Particle tracking (oil spill, debris transport, etc.) Sediment transport (non-cohesive and cohesive) A World of Solutions 18
20 How the tool is applied Coastal Engineering Applications: 1) Hydrodynamic and wave model calibration 2) Morphology model calibration 3) Application - production runs A World of Solutions 19
21 How the tool is applied Coastal Engineering Applications: 1) Hydrodynamic and wave model calibration 2) Morphology model calibration 3) Application - production runs A World of Solutions 20
22 Flow and wave model A World of Solutions 21
23 How the tool is applied Coastal Engineering Applications: 1) Hydrodynamic and wave model calibration 2) Morphology model calibration 3) Application - production runs A World of Solutions 22
24 Morphology model calibration First challenge Computation time: 20 model days ~1 computer day 5*365 model days ~90 computer days! (longer term morphology) Wave, wind and tide input schematization required Selection of representative conditions - reproduce gross and net sediment transport - Mix wave conditions, avoid long repetitions, include the calm wave periods - Individual storms are/were relevant during calibration period (?) A World of Solutions 23
25 Morphology model calibration - Definition of calibration target (measured datasets for model verification) - Sediment budget - Alongshore volume change (erosion/sedimentation curves) - Morphology changes in the inlet - Morphology model (main) variables - Sediment transport formula (e.g. Van Rijn 1997, TRANSPOR 2004) - Cross shore sediment transport coefficients (i.e. SusW/BedW) - Bed roughness: bed forms and roughness predictor - Number and structure of vertical model layers: 3D flow structure and near-bed velocities - Horizontal eddy viscosity (flow) and diffusivity (transport) coefficients - Sediment mapping (3D measured data unavailable) and non-erodible layers - Transverse bed slope effect on transport (AlfaBn) TOTAL: >100 model runs How good is good enough? A World of Solutions 24
26 Examples of morphology calibration results North Topsail and Blind Pass Projects A World of Solutions 25
27 Volume change (1000*cy/yr) Calibration results - North Topsail CH1 CH2 IN1 IN2 IN3 Measured Simulated A World of Solutions 26
28 Calibration results - North Topsail Measured Simulated A World of Solutions 27
29 How the tool is applied Coastal Engineering Applications: 1) Hydrodynamic and wave model calibration 2) Morphology model calibration 3) Application - production runs A World of Solutions 28
30 Application/production runs Calibrated model setup: Parameters Forcing scheme Base case simulation (usually No Action scenario) Several alternatives tested 1 5 year morphology simulations Storm simulations Analysis of absolute and relative results (benefits / impacts) A World of Solutions 29
31 Application/production runs A World of Solutions 30
32 Application/production runs Channel layouts Coastal structures and beach nourishment Blind Pass: under development A World of Solutions 31
33 Conclusions Tidal inlets + adjacent shorelines: extremely complex systems State-of-the-art morphological models (e.g. Delft3D) might supplement other analysis to: better understand beach/inlet changes assess the effects of engineering solutions Morphology calibration is essential for a solid application of the model Calibration target goals of the project Final/calibrated model setup: combination of several choices No general recipe or shortcuts to get there (experience builds up over the years) Good luck in your next morphology model application! A World of Solutions 32
34 A World of Solutions 33
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