CASE HISTORIES OF CORPS BREAKWATER AND JETTY STRUCTURES
NORTH CENTRAL DIVISION
PART I INTRODUCTION
:
Background
The Corps of Engineers (Corps) is responsible for a wide variety of
1.
coastal structures located along the Atlantic and Pacific Oceans, the gulf
coast, the Great Lakes, the Hawaiian Islands, other islands, and inland water-
ways.
jetties are necessary
Coastal improvements such as breakwaters
to provide harbor protection and the safe passage of vessels. These struc-
tures are usually constructed on movable-bed materials and are continuously
subjected to wave and current forces. Under these conditions, structural
deterioration may occur and, in time, maintenance may be required when the
structure fails to serve the needs of the project. Some projects have been
maintained for 150 years or more.
Methods of construction (and repair) have
varied significantly during this time
because of a better
understanding of coastal processes, availability of construction materials,
existing wave climates, regional construction practices, and economic
considerations.
Purpose
2.
The purposes of this report are to lend insight into the scope, mag-
nitude, and history of coastal breakwaters and jetties under Corps jurisdic-
tion; to determine their maintenance and repair history; to determine their
methods of construction; to make this information available to Corps person-
nel; and to address objectives of the Repair, Evaluation, Maintenance, and
Rehabilitation (REMR) Research Program. To this end, case histories of Corps
breakwater and jetty structures have been developed to quantify past and pres-
ent problem areas (if any), steps taken to rectify these problems, and subse-
quent evaluation of the remedial measures. General design guidance can be
obtained from the solutions that have been most successful. Information in
this report should be of particular value to Corps personnel in the US Army
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