Figure 4-36. Mattituck Inlet shoreline, pre- and post-dredging, 16 April 2003 and
15 April 2004
East bank spit migration
Migration of the east bank spit from 1941 to present is summarized in
Figures 4-37a and 4-37b. The orientation of the axis of this formation rotated
from east-west to north-south between 1941 and 1969. This reorientation took
the formation from the end of the east jetty to the mouth of Mattituck Creek.
Estimates of the center lines for the formation for each photograph are
approximated in Figure 4-37a to illustrate the rotation and reorientation. The spit
began to migrate after 1969. It migrated 260 ft from 1969 to 1976, and 80 ft
from 1976 to 1980, with corresponding rates of 37 and 20 ft/year, respectively.
After 1980, the formation appears to have reached locational equilibrium, which
may indicate the limit of transporting capacity of the flood current. However,
this feature could continue to grow into the channel if sediment is supplied to it.
Chapter 4 Morphology Change, and Channel Shoaling and Migration