Form Approved
REPORT DOCUMENTATION PAGE
OMB No. 0704-0188
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1. REPORT DATE (DD-MM-YYYY)
2. REPORT TYPE
3. DATES COVERED (From - To)
September 2001
Final report
4. TITLE AND SUBTITLE
5a. CONTRACT NUMBER
Impacts of Navigation Channel Maintenance Dredging on the Coastal Processes
5b. GRANT NUMBER
of Chatham, Massachusetts
5c. PROGRAM ELEMENT NUMBER
6. AUTHOR(S)
5d. PROJECT NUMBER
5e. TASK NUMBER
Donald K. Stauble
5f. WORK UNIT NUMBER
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
8. PERFORMING ORGANIZATION REPORT
NUMBER
U.S. Army Engineer Research and Development Center
Coastal and Hydraulics Laboratory
ERDC/CHL TR-01-26
3909 Halls Ferry Road
Vicksburg, MS 39180-6199
9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSOR/MONITOR'S ACRONYM(S)
U.S. Army Engineer District, New England
636 Virginia Road
11. SPONSOR/MONITOR'S REPORT
Concord, MA 01742-2751
NUMBER(S)
12. DISTRIBUTION / AVAILABILITY STATEMENT
Approved for public release, distribution unlimited.
13. SUPPLEMENTARY NOTES
14. ABSTRACT
During an extratropical storm on 2 January 1987, a breach formed in a barrier spit opposite the Town of Chatham on the southeast
corner of Cape Cod, MA. An inlet rapidly developed at the site of the breach from wave action and tidal currents. Typical inlet morphology
developed at this new inlet, including a large ebb shoal and swash platform and a single main ebb channel on the ocean side. In the narrow
elongate bay, a north and south flood tidal shoal developed over remnant sand shoals. Over time, the inlet throat widened as the adjacent
barrier spits recurved back into the bay. Navigation through this quickly evolving inlet system became difficult with channel shoaling and
migration. Dredging of parts of the navigation channel has been undertaken since 1989 to maintain an opening for commercial fishing and
U.S. Coast Guard interests between the Atlantic Ocean and the Fish Pier. This dredging removed only a minimal volume of the material,
and has had little impact on the large dynamic system. Inlet morphology evolution include the welding of the South Beach to the mainland
beach, closing off south Chatham Harbor and returning the system to a single inlet system in 1992. By 1995, a north ebb channel had
formed creating a two-ebb channel inlet. Major changes have occurred in the entrance channel and anchorage area of Aunt Lydia's Cove.
The growth and migration of the north flood shoal has changed this channel configuration which has required several dredging events to
maintain navigation to the Fish Pier. Based on the flood shoal area morphology evolution patterns, new dredging boundaries were
(Continued)
15. SUBJECT TERMS
Adjacent shorelines
Ebb shoal
Inlet morphology
Chatham Inlet
Flood shoal
Navigation
16. SECURITY CLASSIFICATION OF:
17. LIMITATION
18. NUMBER
19a. NAME OF RESPONSIBLE PERSON
OF ABSTRACT
OF PAGES
a. REPORT
b. ABSTRACT
c. THIS PAGE
19b. TELEPHONE NUMBER (include area
105
code)
UNCLASSIFIED
UNCLASSIFIED
UNCLASSIFIED
Standard Form 298 (Rev. 8-98)
Prescribed by ANSI Std. 239.18
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