1. IOOS/SURA Extratropical Storm Inundation Testbed: Preliminary Results for Scituate, Massachusetts Changsheng Chen, Qichun Xu, Jianhua Qi and Huichan Lin University of Massachusetts-Dartmouth, New Bedford, MA 02744 Robert C Beardsley Woods Hole Oceanographic Institution, Woods Hole, MA 02543 Rick Luettich University of North Carolina, Morehead City, NC 28557 Joannes Westerink and Aaron Donahue University of Notre Dame, Notre Dame, IN 46556 Harry Wang and Yanqiu Meng Virginia Institute of Marine Science, Gloucester Point, VA 23062-1346 Will Perrie and Bash Toulany Bedford Institute of Oceanography, Dartmouth, NS B2Y 4A2 Donald Slinn University of Florida, Gainesville, FL 32611 U.S. IOOS Coastal Ocean Modeling Testbed 24 January 2011 10 th Symposium on the Coastal Environment 92 nd Annual American Meteorological Society Meeting

2. Overall Goal Investigate roles of model structure and physics, waves, wave-surge interaction, wave current interaction, grid resolution, and computational effort on hindcasting inundation on a local scale driven by an extratropical storm in the Gulf of Maine. Objectives Hindcast inundation at Scituate (MA) during two recent (2005 and 2007) Nor’easters using suite of models with the same grid and forcing; Compare model output with available field data; Inter-compare model output; Formulate initial comparison results and plans for additional model tests. Three Unstructured Grid Models ADCIRC - ADvanced CIRCulation model (SWAN) FVCOM – Finite-Volume Community Ocean Model (SWAVE) SELFE – Semi-implicit Eulerian-Lagrangian Finite Element model (WWM)

3. Scituate, MAThe Test Site: 44013 44029 Tide gauge station

4. A 3-D View of the bathymetry of the Scituate

5. Initial Test Storm Cases 1)May 24 2005 storm; 2)April 17, 2007 (“Patriot’s Day”) storm. Boston tide gauge and NOAA 440013

7. Buoys with wave measurements The Model-Data comparison (for surface waves)

8. Model-Model Comparisons Transects Points -Jericho Road (A, B) -Harbor Master/Town Pier (C) -E. Foster Bridge (D) -Edward Forster Road (E) -Tide gauge (F) -Center of harbor mouth (G) -Cedar Point depression (H) 44 Rebecca Road A1 A2 H I A B C F D E G B1 B2 C1 C2 -Tide gauge -Cedar Point depression Harbor Master/Town Pier- -E. Foster Bridge -Center of harbor mouth Tides and surface Waves The model runs without inclusion of current-wave interaction The model runs with inclusion of current-wave interaction -Jericho Road -Edward Forster Rd

9. 2005 2007 Buoy 44013 Buoy 44029 Surface Wave Simulation in the region domain

10. Tidal Comparisons at Tidal Gauge Station F

11. 2005 extra-tropic storm simulation without inclusion of waves (05:00 GMT, May 25, 2005) ADCIRC FVCOM SELFE Sea level (m)

12. 2005 extra-tropic storm simulation with wave-current interactions (05:00 GMT, May 25, 2005) ADCIRC FVCOM SELFE Sea level (m)

13. Without current-wave interactions With current-wave interactions

14. Without current-wave interactions With current-wave interactions

15. 2007 extra-tropic storm simulation without inclusion of waves (04:00 GMT, April 18, 2007) ADCIRC FVCOM SELFE Sea level (m)

16. 2007 extra-tropic storm simulation with current-wave interactions (04:00 GMT, April 18, 2007) ADCIRC FVCOM SELFE Sea level (m)

17. Without current-wave interactions With current-wave interactions

18. Summary For the same forcing conditions, all three unstructured-grid models are capable of reproducing the tides in Scituate, MA. All three models produced with similar accuracy the sea surface elevation and the same patterns of currents over the shelf outside Scituate. The model results exhibit distinct differences in the current spatial distribution and coastal inundation pattern inside Scituate, particularly in the case with current-wave interactions. The differences in the three model results are probably related to bottom friction parameterization, wave simulations, and algorithms used for current-wave interaction.