Estuarine Flooding and Dewatering Simulation


Simulation Results of Oyster, Bellamy and Piscataqua Rivers, New Hampshire



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Computational grid and simulation setup

pby-mesh.gif (8.3kb) Finite element grid (8621 nodes and 15404 elements)
pby-bat2d.gif (18.3kb) Color map of bathymetric depth

Comments:
The computational grid, named pby for the 3 Rivers is created using linear equilateral triangles fitted to the shoreline boundary. There are 8621 nodes and 15404 elements. The bathymetric depth contour reveals a center channel running east to west.

M2 tidal forcing is specified as a Dirichlet elevation boundary conditions across the western and eastern inlet boundaries. The amplitude is 0.87m at the east boundary (T-UNH) and 1.00m at the west boundary (T-12). The simulation was started with fluid at rest and was terminated after five M2 tidal period (62.10hrs). The simulation setup is given below. All the simulation parameters are summarized in Table below.

Description Parameters
Bathymetry range 0 - 23.00m
Porous layer thickness 0.25m
Hydraulic conductivity 0.0003162
Drag coefficient 0.0025
Time increment 111.78sec
Time steps per tidal period 400
Tidal periodicity 12.42hrs
Duration of simulation 62.10hrs (5 cycles)
Numerical implicity 1 (fully implicit)
Number of nonlinear iterations 7

Simulation parameters for Oyster, Bellamy and Piscataqua Rivers.

Comments:

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Tidally averaged residual analysis

Residual transport:

pby-resq.gif (10.9kb) Oyster, Bellamy and Piscataqua Rivers

Residual velocity:
pby-resv.gif (11.3kb) Oyster, Bellamy and Piscataqua Rivers

Residual bottom stress:
pby-ress.gif (10.7kb) Oyster, Bellamy and Piscataqua Rivers

Residual sediment transport:
pby-rest.gif ( 9.7kb) Oyster, Bellamy and Piscataqua Rivers

Comments:

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Transient solution

pby-ebb.gif (17.9kb) Maximum ebb at dynamic equilibrium.
pby-fld.gif (19.4kb) Maximum flood at dynamic equilibrium.
pby-hv.fli (0.42Mb) FLC animation of tidal time transport (H*v)
pby-v.fli (0.34Mb) 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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