Figure 5-7 plots current velocity measurements collected 7-8 October 2002
(Current meter 1) and ADCIRC calculations. The model reproduces both the
peaked crest and trough in the current. The measurements contain these features,
somewhat obscured by noise in the signal. The deviation from a sine curve is
caused by nonlinearity in the tidal wave as it shoals into shallow water from
Long Island Sound.
60
________ Measurements
Mattituck Creek Current Velocity
________
ADCIRC Calculations
40
20
0
-20
-40
-60
7.00
7.50
8.00
8.50
9.00
7-8 October 2002
Figure 5-7.
Current velocity at Mattituck Creek; measurements and ADCIRC
calculations, 7-8 October 2002
Pre-dredging condition (2002)
Calculated current velocities, based on the bathymetric survey data of
6-8 October 2002, are presented here. Calculated velocities offshore of
Mattituck Inlet range from 0 to 0.6 m/sec, and calculated velocities within
Mattituck Inlet range from 0 to 0.5 m/sec. Near-maximum calculated flood and
ebb current velocities for the offshore study area are shown in Figures 5-8a and
5-8b, respectively. These figures plot the calculated near-maximum flood and
ebb tide velocities during a period of spring tide, at approximately 1200 and 1830
GMT on 7 October 2002, respectively. The velocities are termed near-maximum
in that the time of maximum was sought for the area around the inlet, which may
not be the maximum in the channel or in the nearshore.
213
Chapter 5 Circulation Analysis