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.

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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