Model Verification
In order to verify the M2D model, calculated water levels were compared to
measurements collected during 1998 as part of a field monitoring system sponsored
by the USACE New York District, the CIRP, and the New York State Department of
Environmental Conservation. For the verification, M2D was forced with water-
surface elevation values along the seaward boundary and at the Shinnecock and
Quogue canals. Water levels were extracted from the regional ADCIRC model of
Long Island (Militello and Kraus 2003) from November 4, 1998 through November
16, 1998. Wave forcing was not included in the verification, and calculation of
sediment transport rates and morphology change was not invoked. Field data used
for comparison were collected by a pressure gauge mounted along the bay side of
Shinnecock Inlet near the western barrier. Results indicate the tidal elevation was
well predicted (Fig. 10), and the calculated tidal range was within 12 percent of the
observations. This error was comparable to that of the ADCIRC calculations for the
same location (Militello and Kraus 2001a), indicating that the primary source of error
was introduced by the boundary conditions obtained from the regional model. A
meteorological event occurred during November 10 through November 14. The
measured water level shows response to this atmospheric forcing. However,
calculations for model verification were forced with tide alone so they do not contain
deviations owing to wind events. Presently wind forcing can only be implemented as
a constant stress and would not be applicable in a time varying simulation.
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
11/4/98
11/6/98
11/8/98
11/10/98
11/12/98
11/14/98
11/16/98
Date
Figure 10. M2D model verification bay side of Shinnecock Inlet. Observed data
indicated by solid black line, calculated water level shown as dotted line.
12
Previous Page
