Tropical Report: Modeling Hurricane Ike with SLOSH Don Slinn, Jeff Ren, Go Fujita Univ of Florida Coastal Engineering Simulations 1.Basic Slosh wind model no waves 2.Slosh winds + Garratt wind drag law 3.Slosh winds + wave forces 4.Slosh winds + wave forces + wave mass fluxes 5.OWI winds + Garratt wind drag law 6.OWI winds + wave forces 7.OWI winds + wave forces + wave mass fluxes 8.Slosh basic on Larger Basin 9.Slosh basic with lower bottom friction Cd = 0.003 Cd=( U) Cap at Stress=rho*Cd*U*(u,v) Wave Mass Flux Depth Averaged Currents (Stokes Drift) Caused by Wave Crests higher than troughs (Starr, 1947) Inclusion of Wave Forcing in SLOSH 1.Wave stresses 2.Mass flux transport INTRODUCTION METHODOLOGY RESULTS CONCLUSIONS Wave Calibration plots 42035 Case 3 Case 1 Case 4 Case 1 OWI Wind Wave +MF Map of Data Locations Sabine Pass Grid MEOW of Low Bottom Friction Cf = 0.003 Cf=0.003, same color scale as original ETSS background Resolution varies Gulf of Mexico ~ 4km East Coast ~ 9.4km Alaska ~ 6.7km West Coast ~ 6.5km Each run has a 2 day initialization and a 4 day forecast period, for a total of 6 days Results posted to the web (text & hydrographs)expr/DF.gr2/DC.ndgd/GT.slosh/ (gridded data)expr/DF.gr2/DC.ndgd/GT.slosh/ GOM_EAST/SURGE_GOM_EAST_96_HR.shtml (gridded)GOM_EAST/SURGE_GOM_EAST_96_HR.shtml ETSS results for 3/4/2011 MDLs website displaying total water level station status map, based on ETSS output OPCs website displaying gridded ETSS results Forecast Total Water Level for Hurricane Ike, Based on ETSS OPCs website displaying gridded ETSS results for 3/4/11 Station total water level plot showing forecast for Ike storm surge event at Galveston, TX Summary Surge Low 2 day simulation doesnt catch forerunner Small domain cant catch basin effects Changing bottom friction increases surge by 1 m Larger domain solution (not yet assessed) Waves add 1 m in some locations More data comparisons coming soon Summary Slosh model implemented for Ike with: OWI Winds and / or Garratt Wind Drag Coupled with Waves Adjustments to Bottom Friction Several details in development Wind Stress reduction Automatic Plotting Algorithms Post processing and Data Comparison Additional Work Hurricane Rita (other storms easier for Slosh to give good estimates: Andrew, Charlie) Comparison to High water marks and measurements Time series: cross shore locations Wind stress reduction over land Bottom Friction adjustments (not quadratic law)