Estuarine Flooding and Dewatering Simulation |
| port3-mesh.gif (18.3kb) | Finite element grid (8577 nodes and 14974 elements) |
| port3-bat2d.gif (36.9kb) | Color map of bathymetric depth |
Comments:
The computational grid, named
port3 for the
Great Bay Estuary system is created using linear equilateral triangles
fitted to the shoreline boundary. There are 8577 nodes and 14974 elements.
The bathymetric depth contour
reveals a center channel running south to
north.
M2 tidal forcing is specified as a Dirichlet elevation boundary condition
across the southern and northern inlet boundariesy. The
amplitude is 1.35m at the southern boundary and 1.00m at the northern boundary. The
simulation was started with fluid at rest and was terminated after
six M2 tidal period (74.52hrs). The simulation setup is
given below. All the simulation parameters are summarized in Table below.
| Description | Parameters |
| Bathymetry range | 0 - 25.40m |
| Porous layer thickness | 0.25m |
| Hydraulic conductivity | 0.0003162 |
| Drag coefficient | 0.0050 |
| Time increment | 111.78sec |
| Time steps per tidal period | 400 |
| Tidal periodicity | 12.42hrs |
| Duration of simulation | 74.52hrs (6 cycles) |
| Numerical implicity | 1 (fully implicit) |
| Number of nonlinear iterations | 10 |
Residual transport:
| port3-resq.gif (18.3kb) | Portsmouth Harbour |
| port3-resv.gif (18.8kb) | Portsmouth Harbour |
| port3-ress.gif (12.8kb) | Portsmouth Harbour |
| port3-rest.gif (14.4kb) | Portsmouth Harbour |
Comments:
| port3-ebb.gif (17.9kb) | Maximum ebb at dynamic equilibrium. |
| port3-fld.gif (19.4kb) | Maximum flood at dynamic equilibrium. |
| port3-hv.fli (1.58Mb) | FLC animation of tidal time transport (H*v) |
| port3-v.fli (0.97Mb) | FLC animation of tidal time velocity (v) |
Comments:
The above transient solutions are numerically well-behaved and appear to
describe the realistic dynamics of the tidal flooding and dewatering process
in this complex domain.


Last modified:September 21, 1998 (Safak Nur ERTURK)