GenCade. Combining and Extending the GENESIS and Cascade Models for Planning and Design in a Regional Sediment Management Framework
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1 GenCade Combining and Extending the GENESIS and Cascade Models for Planning and Design in a Regional Sediment Management Framework G Presented by Nicholas C. Kraus For the GenCade Development Team Ken Connell, Hans Hanson, Magnus Larson, Alan Zundel Sophie Munger, Ashley Frey, Tanya Beck, Nick Kraus February 3-5, rd Annual Crowne Plaza Melbourne Oceanfront National Conference on Beach Coastal Inlets Research Indialantic, Program FL Preservation Technology 1
2 GenCade Applicability Regional processes, Long-term morphology change Project Planning & Design Habitat Change Regional Sediment Management Beach fills Inlet bypassing Channel maintenance Unifying technology for multiple projects Intuitive interface (SMS) Storm erosion hazard management Dune erosion, overwash, & breach susceptibility; coastal response to SLR Habitat evolution (Piping Plover; vegetation) Coastal Inlets Research Program 2
3 The world of GENESIS NEMOS 1,001 LICENCES 2008 GENESIS/DOS 205 SITES, ~1,000 INSTALLATIONS Coastal Inlets Research Program 3
4 GENESIS and Cascade Chronology GENESIS & Cascade Evolution Proto-GENESIS 1984 Major prototype application: Oarai Beach, Japan 1985 Seawall representation 1985 GENESIS goes to CERC 1986 Generalized interface: Named GENESIS 1987 GENESIS gets a Ph.D. (Hans Hanson) 1989 Transmissive detached breakwaters included 1993 Improved groin representation: Transmission & bypassing 1996 Research: migrating longshore sand waves 1997 Research: cross-shore seasonal variation 1999 Economic optimization of beach fill transition 2000 Representation of tombolos 2000 Research: transport function of waves + tidal currents 2001 Representation regional morphologic trends 2002 Cascade, including regional contour & Inlet Reservoir Model 2002 Time-dependent detached breakwater transmission 2003 Cascade, spatially varying K and D C : nesting with GENESIS through regional lateral BCs 2004 Cascade, inclusion of refined inlet Reservoir Model 2004 Research: Offshore losses of fine sediments 2004 Representation of T-head groins 2006 Cascade, cross-shore model of combined dune erosion, overwash, and wind-blown sand 2007 Research: New longshore transport formula 2008 Cascade, Rapid calculation of breaking wave properties representation GenCade based on USACE release code 2008 Research: Beach-dune interaction 2009 Variable grid alongshore; other speed-ups 2009 Inlet Reservoir Model included Coastal Inlets Research Program 4 x D D D B D C y
5 GENESIS + Cascade GenCade G Integrate from planning through engineering design Cover time scales from days to centuries GENESIS (bottom to top) Engineering design tool Preserve regional trends Can represent all engineering Furnish regionally consistent boundary conditions to local projects islands; cumulative impacts; retains details structures, etc. Represent cumulative local projects interacting regionally curvature of regional geomorphology Mature technology big payback Represent inlet bypassing and tidal delta by evolution updating Resolve engineered elements Typical grid resolution ~ 25 m Include variable grid resolution for accuracy and efficieny Improve computational efficiency (over GENESIS) Cascade (top to bottom) Planning tool (RSM Support) Time scales: months to centuries Multiple inlets, shoals, and barrier Fast Typical grid resolution ~ 500 m Cross-shore processes in future Strategy: Add Cascade capabilities to GENESIS to automatically include all GENESIS features Coastal Inlets Research Program 5
6 GenCade & Coastal Sediment Dynamics Moriches Bay Ebb shoal Flood shoal D 50 = 0.27 (W) 0.38 (E) Dune erosion Atlantic Ocean 150,000 m 3 /yr Wind-blown sand Overwash Coastal Inlets Research Program 6
7 GenCade in the SMS Interface Surface-water Modeling System Intuitive interface for project: conception completion Data entry, cleaning, and archiving GenCade grid and input development: baseline and alternatives GenCade simulations: baseline and alternatives Post-processing, analysis, and figure generation World coordinates everything georeferenced Datum reprojection and transformation Georeferenced aerial photograph support GIS functions and connections to ArcGIS and Google Earth CAD display and conversion support for AutoCAD & MicroStation Improved graphics Potential to connect to other USACE numerical models in the SMS Coastal Inlets Research Program 7
8 GenCade variable grid alongshore Detached Breakwater 3-month simulation 250 m offshore 100 m long H = 1 m, T = 5 sec, θ = -5 deg. N = 200 DX = 10 m N = 40 DX max = 100 m DX min = 10 m Coastal Inlets Research Program 8
9 GenCade Transmissive Breakwater Detached Breakwater 12-month simulation 60 m offshore 100 m long H = 1 m, T = 5 sec, θ = -5 deg. N = 200 DX = 10 m Shoreline Location (m) K t Distance Alongshore (m) Coastal Inlets Research Program 9
10 GenCade Interface (in the SMS) Example Beach fill locations Bogue Inlet Bear Inlet Brown Inlet Beaufort Inlet Rich Inlet Mason Inlet New River Inlet New Topsail Inlet Masonboro Inlet WIS Wave Stations Carolina Beach Inlet Coastal Inlets Research Program 10
11 GenCade Interface (in the SMS) Coastal Inlets Research Program 11
12 GenCade Interface (in the SMS) 10 6 Coastal Inlets Research Program 12
13 Example Necessity for Regional Contour No regional contour With Regional Contour Coastal Inlets Research Program 13
14 Example Jetties on Concave Coast (Local projects in regional context) No regional contour With regional contour Coastal Inlets Research Program 14
15 Example Concave Coast No regional contour With regional contour Coastal Inlets Research Program 15
16 Inlet Reservoir Model Inlet bypassing and evolution of inlet deltas V e, V eq Ebb Shoal Q eb Ocean Q ie Q in Q ic Up-Drift Barrier Is. Q fe Channel Q ce Attach. Bar Q ba Down-Drift Barrier Is. Q out Bay Q cf V f, V fq Flood Shoal Coastal Inlets Research Program 16
17 Example Application (Cascade) Brunswick County, NC, Cascade 2009 Coastal Inlets Research Program 17
18 Brunswick County, NC, Cascade Connecting Beaches and Coastal Inlets Wutkowski et al. (2009) Regional analysis for Brunswick County, NC, Beaches & Inlets. Proc. FSBPA Alt 1: 49. 7M cy, 48 yr Alt 8: 20.7 M cy, 48 yr Recycle sand between inlets and beaches (Saves more than half the cost of the original alternative) Coastal Inlets Research Program 18
19 Onslow Bay, NC, GenCade (Prelim!) Connecting Beaches and Coastal Inlets Preliminary Results Coastal Inlets Research Program 19
20 GenCade for Long Island Extending domain to here Current Grid Terminus Moriches Inlet Long Island Case Shinnecock Inlet Grid Origin Coastal Inlets Research Program 20
21 Internal and External Wave (and other) Model Interconnectivity SMS interface Coastal Inlets Research Program 21
22 GenCade Development Available in 2011 Longshore processes only vs. longshore with cross-shore processes Measured and calculated shoreline change and analysis of reduced groin length Overwash Dune erosion Wind-blown sand Groin field, Westhampton, NY Coastal Inlets Research Program 22
23 GenCade Summary New model from the USACE Shoreline response to engineering actions Connects inlets and beaches Regional trends represented Planning through engineering Available in the SMS September 2010 longshore processes Beta users? no pain, no gain please sign up for earlier testing September 2011 cross-shore processes World coordinates Habitat modeling planned Coastal Inlets Research Program 23
24 Thank you for your attention G D D x D B y D C SWL Coastal Inlets Research Program 24
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