Technical Support in Engineering Construction Phase of Craney Island Eastward Expansion

1. Technical Support in Engineering Construction Phase of Craney Island Eastward Expansion Mac Sisson, Harry Wang, Jian Shen, Yuepeng Li, Albert Kuo, and Wenping Gong VIMS Numerical Modeling Group Gloucester Point, VA April 2008

2. Introduction and Background

3. South cell of Proposed CIEE expansion: Phase 1

4. Existing APM Terminal and Dredged Area Proposed Norfolk Harbor Dredging by Navy Proposed Craney Island Eastward Expansion: Fully Expanded

5. OUTLINE • Assessment of long-term, cross-sectional impacts • Will the long-term hydrodynamic circulation conditions at the mouth of the Elizabeth River be adversely affected by the new CIEE design? • SSFATE sediment plume modeling ----next • Water quality modeling ----next • - Calibration of water quality model • Scenario for full expansion • Assessment of point source impacts ** Separate presentation by Billy Johnson

6. Assessment of long-term, cross-sectional impacts • What are the local impacts from the change to the cross-section at the mouth of the Elizabeth River? • Are there any far-field impacts to the hydrodynamic circulation conditions in the Elizabeth River or the Lower James?

7. Modified CIEE Design - 2007

8. Global analysis methodology • Determine differences in time series between base case and project case. • Generate spatial plots of these differences. • Plot frequency distributions of these differences as an areal percentage. • Compare the cumulative percentages of the frequency plots as a metric for impact assessment.

18. SSFATE Sediment Plume Modeling • VIMS has provided construction sequence, and all the hydrodynamic conditions (including 4 different trench depths) needed from the far field model (forwarded as NetCDF files). • The SSFATE sediment plume modeling was performed by Dr. B. H. Johnson at CHT.