Summary of Inlet Characteristics
Findings of this study on the morphology, sediment, hydrodynamics, and
engineering activities at Mattituck Inlet and Goldsmith Inlet are summarized in
Tables 7-1 to 7-4, respectively. These compilations are discussed in subsequent
sections of this chapter.
Table 7-1
Mattituck Inlet and Goldsmith Inlet Morphologic
Characteristics
Characteristic
Mattituck Inlet
Goldsmith Inlet
r ratio
64-107
4.5-7.5
Hydrodynamic dominance
Tide dominated (low)
Tide dominated (low)
Offshore depression on both
Offshore characteristics
Longshore bars west of inlet
sides of inlet
Gross longshore sediment
transport rate estimate
(cu yd/year)
15,000 - 25,000
16,000 - 21,000
Presence of ebb shoal
No
No
Presence of flood shoal
Yes
Yes
Bypassing mechanism
Probably small to negligible
Within swash zone
Channel shoaling mode
Bank encroachment
Channel infilling
Minimum cross-sectional area
(observed) (sq ft)
1,600
80
Minimum cross- sectional area
(theoretical prediction) (sq ft)
1,020
114
Average depth (ft, mlw)
9
1-2
Channel width-to-depth ratio
43
32
Table 7-2
Mattituck Inlet and Goldsmith Inlet, Nearshore Slopes and
Sediment Grain Size
Characteristic
Mattituck Inlet
Goldsmith Inlet
Nearshore slope - west of Inlet
1:15
1:10
Nearshore slope - east of Inlet
1:25
1:10
Median grain size - west of Inlet
3.15
3.0
(mm)
Median grain size - east of Inlet
0.49
0.49
(mm)
Median grain size - channel
entrance (class)
Coarse sand
Coarse gravel
Median grain size -
mid-channel (class)
Medium to fine sand
Medium to fine gravel
Median grain size - channel
egress (class)
Very coarse sand
Very coarse to coarse sand
Median grain size - flood shoal
(not sampled)
Very coarse to coarse sand
287
Chapter 7 Comparative Analysis and Conclusions
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