6
10
Jarrett regression equation
Byrne et al regression equation
Chesapeake Bay unjettied inlets
5
10
Atlantic coast dual-jettied Inlets
Mattituck Inlet
Goldsmith Inlet
4
Lagoon Point Inlet
10
Lake Hancock Inlet
3
10
2
10
1
10
0
10
4
5
6
7
8
9
10
10
10
10
10
10
10
10
Tidal Prism, cu ft
Figure 6-11. Comparison of channel cross section and tidal prism relations
The trend lines were extended beyond their empirical ranges of validity for
visual comparison. The trends for the Atlantic coast dual-jetty inlets and the
small natural inlets are different. On Figure 6-11, Mattituck Inlet lies at the
lower end of the Atlantic Coast dual-jetty inlets and close to the regression line.
In contrast, Goldsmith Inlet lies at the upper end of the small Chesapeake Bay
inlets, and it almost falls on top of their regression line. The two small Puget
Sound inlets are also compatible with the small-inlet trend developed from the
Chesapeake Bay inlets.
It appears that the conclusion of Byrne et al. (1980) about the greater
efficiency of small inlets is valid, although it can be argued that the Goldsmith
Inlet and two Puget Sound Inlet data points are compatible with an extension of
the Atlantic coast dual-jetty trend line. However, it is considered that the
location of the Goldsmith Inlet point is accidental in plotting near the Atlantic
coast dual-jetty trend line, as do a few of the Chesapeake Bay data points.
285
Chapter 6 Inlet Morphology and Stability
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