Estuarine Flooding and Dewatering Simulation



Simulation Results of Porstmouth Harbour, New Hampshire





Computational grid and simulation setup

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

Simulation parameters for the Portsmouth Harbour.


Tidally averaged residual analysis

Residual transport:

port3-resq.gif (18.3kb) Portsmouth Harbour

Residual velocity:
port3-resv.gif (18.8kb) Portsmouth Harbour

Residual bottom stress:
port3-ress.gif (12.8kb) Portsmouth Harbour

Residual sediment transport:
port3-rest.gif (14.4kb) Portsmouth Harbour

Comments:


Transient solution

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.

[ Introduction ] [ Great Bay ]
[ Bellamy River ] [ Oyster River ] [ Piscataqua River ] [ Portsmouth Harbour ]
[Oyster,Bellamy and Piscataqua Rivers] [Great Bay with Oyster and Bellamy Rivers]
[Portsmouth Harbour with Piscataqua River] [Whole Great Bay Estuary System]


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

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