Environmental and Water Resources Engineering Division Civil Engineering Dr. Soumendra Nath Kuiry Assistant Professor Hurricane Gustav (2008) Simulation by CCHE-Coast

Civil Engineering Civil Engineering HPC Lecture Model Description: CCHE-Coast CCHE-Coast 3. Spectral-wave Model 1. Hydrodynamic Model 2. Hurricane Track Model (Yafei Jia)(S. N. Kuiry)(Yan Ding) 2/24

Civil Engineering Civil Engineering HPC Lecture Hurricane Gustav (2008) Track Fig. 1: The track of hurricane Gustav (2008) by Weather Bug 5/24

Civil Engineering Civil Engineering HPC Lecture Computational Domain Fig. 2: Computational area selected for the present study is delimited by the red line Longitudinal: 91  37'27" W - 87  40'18"W Transverse: 28  34'35" N - 30  46'27" N Cocodrie, LA Landfall Point 6/24 Area: 440km  320km

Civil Engineering Civil Engineering HPC Lecture Computational Mesh The Study domain covers a large area (about 440 km  320 km). The major features include Rivers, Lakes, Levees, Roads, Protection structures and barrier islands. Block structured mesh were created using 17 blocks. Each block was controlled for certain resolution. The bathymetry was derived from SL15 mesh created by USACE. The mesh has 2103 and 1088 grid points in the longitudinal and latitudinal directions: about 2.29 million nodes. 7/24 Fig. 3: (a) New Orleans storm protection System and (b) its implementation in the mesh (a) (b)

Civil Engineering Civil Engineering HPC Lecture Mississippi River Atchafalaya River Bathymetry and Mesh Fig. 4: The bathymetry and the mesh consisting of 2,288,064 nodes 8/24

Civil Engineering Civil Engineering HPC Lecture Details of New Orleans City, Structures and Rivers Fig. 5: Enlarged view showing the details of the final mesh area around Lake Pontchartrain and the Pearl River. 9/24

Civil Engineering Civil Engineering HPC Lecture Bottom Friction Fig. 6: Manning’s roughness coefficient Roughness coefficients are obtained from land use and land cover map of the area provided by USACE. In the extended area a constant value 0.02 is considered. 10/24

Civil Engineering Civil Engineering HPC Lecture Input Parameters Storm Track – best track observed by NOAA Tides - the observed tidal elevations at the Pilots Station East, SW Pass, LA is used as the tidal boundary condition at the south open sea boundary. Waves – the observed wave data from NDBC is applied at the sea boundary. River inflows - The stream gages USGS on Mississippi River at Baton Rouge, LA and USGS on Atchafalaya River at Simmesport, LA provided the inflow discharges during Hurricane Gustav (2008). Simulation period - from 08/25/2008 0:0 hrs – 09/03/2008 0:0 hrs. 11/24

Civil Engineering Civil Engineering HPC Lecture Boundary Conditions Mississippi River Atchafalaya River Fig. 7: The river inflows and tide at the sea boundary imposed as boundary conditions 12/24

Civil Engineering Civil Engineering HPC Lecture Computational Challenges 13/24 Domain size Mesh Generation Model run Visualization of Results

Civil Engineering Civil Engineering HPC Lecture Results and Discussions 14/24

Civil Engineering Civil Engineering HPC Lecture Location and Index of Stations Fig. 8: The location of observation stations for comparative study 15/24

Civil Engineering Civil Engineering HPC Lecture Comparison of Water Surface Elevations NOAA Dauphin Island, AL NOAA Mobile State Docks, AL NOAA Pascagoula NOAA Lab, MS NOAA Pilots Station East, LANOAA Bay Waveland Yacht Club, MSNOAA Port Fourchon, LA Fig. 9: Time series of computed and observed water surface elevations 16/24

Civil Engineering Civil Engineering HPC Lecture Maximum Water Surface Elevations (b) Fig. 10: Computed maximum water surface elevation above NAVD88: (a) Forbes et al. (2010) and (b) present simulation 17/24

Civil Engineering Civil Engineering HPC Lecture Animation: Water Surface Elevations Fig. 11: Animation of water surface elevation (01/09/08 0:0 hrs – 02/09/08 0:0 hrs) 18/24

Civil Engineering Civil Engineering HPC Lecture Wave Parameters Fig. 12: Comparisons: (a) significant wave height and (b) mean wave period 19/24 (a) (b) NDBC Luke Offshore Test Platform (a)(b) NDBC Biloxi station

Civil Engineering Civil Engineering HPC Lecture Wind Speed Comparison Fig. 13: Time series of computed and observed wind speeds at different stations 20/24

Civil Engineering Civil Engineering HPC Lecture Wind Direction Comparison Fig. 14: Time series of computed and observed wind directions at different stations 21/24

Civil Engineering Civil Engineering HPC Lecture Computed Wind Field Fig. 15: Computed wind field on 1 Sep 2008 at 7:50 hrs Fig. 16: Computed wind field on 1 Sep 2008 at 16:00 hrs Fig. 17: Wind field animation (01/09/08 0:0 hrs – 02/09/08 0:0 hrs) 22/24

Civil Engineering Civil Engineering HPC Lecture Computed Air Pressure Field Fig. 18: Computed air pressure fields on 1 Sep 2008 at 7:50 hrs Fig. 19: Computed air pressure fields on 1 Sep 2008 at 16:16 hrs Fig. 20: Air pressure field animation (01/09/08 0:0 hrs – 02/09/08 0:0 hrs) 23/24

Civil Engineering Civil Engineering HPC Lecture Computational Resources 24/24  Multi-cores (more than 12)  NVIDIA graphic card for GPU operations  Tecplot software in the high speed computer  A Wiki of subroutines for known algorithms  Video tutorials for large scale computations