Learning Objective: Identify types
of waterfront structures and their
uses.
1-16.
In which of the following ways are
a breakwater and a jetty both
(a) similar and (b) different?
1.
(a) Both are used to direct
the current flow in a channel
(b) a breakwater is an
alongshore structure
2.
(a) Both are alongshore
structures used to break
the action of waves
(b) a jetty has a paved top
for vehicular traffic
3.
(a) Both are offshore
structures used to break the
action of waves
(b) a jetty directs the current
flow along the line of a
channel
4.
(a) Both are harbor-shelter
structures
(b) a breakwater extends out
from the shoreline
1-17.
To establish a definite shoreline
and maintain it against wave
erosion, what type of structure
should the engineer design?
1.
Seawall
2.
Breakwater
3.
Jetty
4.
Groin
1-18.
To allow ships to lie alongside
for loading and unloading, what
type of structure should be used?
1.
Wharfage
2.
Offshore
3.
Stable shoreline
4.
Mole
1-19.
In which of the following
conditions can a concrete cap
structure be used on a breakwater
or jetty?
1.
Deep-water site only
2.
Extra-high tide range only
3.
Deep-water site or extra-high
tide range
4.
Shallow-water site
1-20.
How are the individual units
of a precast cap structure for
a breakwater (a) taken to and
(b) placed in their proper
location?
1.
(a) Floated (b) sunk
2.
(a) Carried (b) driven
3.
(a) Craned
(b) dropped
4.
(a) Barged
(b) unloaded
1-21.
In which of the following uays are
a seawall and a bulkhead both
1-22.
(a)
1.
2.
3.
4.
similar and (b) different?
(a) Both protect a shoreline
against erosion
(b) a bulkhead is supported
by its own weight
(a) Both protect a shoreline
against erosion
(b) a bulkhead is relatively
thin and usually consists of
steel sheet piles
(a) Both are relatively thin
and self-contained
(b) bulkheads are normally
cast-in-place concrete
structures
(a) Both are relatively thick
and self-contained
(b) a bulkhead can be
constructed using wooden sheet
piles
To allow ships to come alongside,
bulkheads are fitted with
1.
wales and anchors
2.
piles and quays
3.
timber caps and batter fenders
4.
mooring cleats and dolphins
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