Table 6-7
Goldsmith Inlet Flood Shoal and Physical Quantities
Location
West and Channel Lobe
East Lobe
Ambient depth (ft)
2
4.5
4
4
7.86 10
3.0 10
Surface Area (sq ft)
Estimated volume
above ambient depth
(cu yd)
5,825
5,000
Estimated volume
above shoal (cu yd)
2,910
1,285
Estimated volume of
flood shoal (cu yd)
2,915
3,715
The total flood shoal volume was also estimated with the empirical relation
of Carr de Betts (1999). Because of the small size of Goldsmith Inlet and pond,
the relation that predicts the near field ebb shoal volume was employed, as it is
believed that much of the flood shoal accumulation can be observed. Applying a
tidal prism of 3.04 106 cu ft, the total volume of the flood shoal was calculated
to be 1.88 105 cu yd and the total flood shoal area was calculated to be 2.80
106 sq ft. The directly calculated volume of both lobes is 6,630 cu yd.
The empirical relation overestimates the volume derived from measurements
by a factor of 30. Reasons for this are the same as presented in the analysis for
Mattituck Inlet.
Discussion of Channel Cross-Sectional Area
Relations
Channel cross-sectional areas of Mattituck Inlet and Goldsmith Inlet are
compared here. To examine the response of cross-sectional areas of small inlets
such as these to tidal forcing, the Jarrett (1976), equation for Atlantic coast dual-
jettied inlets is drawn together with the Byrne et al. (1980) equation for small,
inlets without jetties (Figure 6-11). Data from which the regression equations
were obtained are included in the plots. Measurements for the two Puget Sound
gravelly inlets from Simpson (1976) and for Mattituck Inlet and Goldsmith are
also plotted.
284
Chapter 6 Inlet Morphology and Stability
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