1. NOAA/NOS/OCS/Coast Survey Development Laboratory Lyon Lanerolle 1,2, Richard Patchen 1 and Frank Aikman III 1 1 National Oceanic and Atmospheric Administration (NOAA) National Ocean Service/Office of Coast Survey/Coast Survey Development Laboratory 1315 East-West Highway, Silver Spring, MD 20910 2 Earth Resources Technology (ERT) Inc. 10810 Guilford Road, Suite 105, Annapolis Junction, MD 20701

2. NOAA/NOS/OCS/Coast Survey Development Laboratory CBOFS2 Model Grid

3. NOAA/NOS/OCS/Coast Survey Development Laboratory CBOFS2 Wind Speed Time-Series Criteria for Choosing Hindcast Period Hurricane Isabel

4. NOAA/NOS/OCS/Coast Survey Development Laboratory CBOFS2 Total River Volume Discharge Criteria for Choosing Hindcast Period Events/Wet Periods Dry Periods Synoptic Hindcast simulation period : June 01, 2003 – August 31, 2005

5. NOAA/NOS/OCS/Coast Survey Development Laboratory Initialization Fields Model spun-up from rest : water elevations, currents zero and T, S non-zero For latitude ≤ 39.2 o N, for T, S fields used WOA2001 climatology for the Bay axis region and for tributaries used CBP observations (blended via bi-linear interp.) For latitude ≥ 39.2 o N, for T, S fields used only CBP observations (CBP data more abundant and better) Interpolated the T, S in the vertical linearly Initialization date : June 01, 2003 (0000 hrs GMT)

6. NOAA/NOS/OCS/Coast Survey Development Laboratory CBOFS2 River Forcing - I River volume discharge adjustment factors (Wen Long)

7. NOAA/NOS/OCS/Coast Survey Development Laboratory CBOFS2 River Forcing - II River volume discharges from USGS River forcing at daily frequency Discharges ramped-up in time over 5-day period (linearly) Discharges distributed vertically according to parabolic profile When rivers distributed over multiple cells, discharge scaled by cross- sectional area Some tributaries combined (e.g. Susquehanna, Choptank, Patuxent, etc.) Rivers non-tidal River T and S from CBP data for 2003- 2005

8. NOAA/NOS/OCS/Coast Survey Development Laboratory CBOFS2 Meteorological Forcing NARR blended (via interpolation) observations for winds, air T, air P and RH (via DP) Forcing fields are hourly Avoid using NARR values on land for winds, air T, RH and down. SW Delete NARR grid nodes near obs. to facilitate more effective blending Winds at 10m, air T, RH at 2m and LW down, net SW, air P at surface Use 80% of NARR SW after compar- ing with observations Ramp-up winds over 5-days (linearly) ROMS internally interpolates met. fields via bi-cubic interpolation

9. NOAA/NOS/OCS/Coast Survey Development Laboratory CBOFS2 Open Boundary Forcing Open boundaries selected to be pinned at Duck, NC and Ocean City, MD because of observations For water elevations on shelf boundary use ADCIRC harmonics for tides with non-tidal contribution from two corners (interpolated) ADCIRC harmonics adjusted at two corners to match observations exactly using ℮ -5x scaling function along CBOFS 2 open boundary For C & D canal water elevations, use Reedy Point total elevations On shelf boundary use ROMS reduced OB conditions so no need for currents; at C & D OB, use currents from tidal prediction with NOS Stn. 154 (1984 survey) harmonics For T, S on shelf boundary use WOA 2001 climatology For T, S at C & D canal boundary use values from USGS station 0142800 which is within DE Bay T, S forcing is daily and water elevation and currents is 6-minutely (NOS standard) Forcing again ramped-up over 5-day period (linearly)