MIL-HDBK-1025/5
Protect the entrance channel from wave action and cross
c)
Stabilize the inlet location.
d)
2.5.4.2
Types.
These include:
Rubble-mound structure.
a)
Sheet pile structure (see Figure 25).
b)
Details.
Refer to Shore Protection Manual, Volume II; DM-26.1; and
2.5.4.3
DM-26.2.
Wave and Surge Dissipators.
2.5.5
Purpose. These devices are often provided to reduce turbulence in
2.5.5.1
the boat basin caused by wave energy and surge.
Typical Devices.
Some typical devices are described below:
2.5.5.2
A non-uniform array of large stones placed on a flat slope
a)
facing the outer entrance at the first turn in the entrance channel.
Wave-absorption beach, recessed in the elbow of the first bend
b)
in the channel.
Wave reflector, designed to reflect the waves back toward the
c)
first leg of the entrance channel.
Combination of a trapezoidal channel-bed section and upper
d)
slopes roughened by large stones in the revetment.
Bank Protection. It is often necessary to protect banks from waves
2.5.6
and currents in the channel. Protection installations include:
Rubble layer placed on filter layer.
a)
Sheetpile or poured-in-place concrete wall at the top and a
b)
revetted slope from the toe of the wall to the channel bottom.
River Protection. To berth boats directly in a river, the
2.5.7
following methods can be used to provide protection to the berthing area.
Current Deflector Placed Upstream. This is built as a pile-dike
2.5.7.1
fence inclined downstream, with heavy beams for horizontal members in the area
of surface-level fluctuations to fend off floating debris.
Shallow Basin Excavated into the Riverbank (see Figure 26).
2.5.7.2
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