baskets should be tied together with appropriately sized wire to prevent shifting of upper tiers over lower
tiers, and tight packing is needed to minimize distortion of the baskets and damage to the wire. Adequate
toe protection is required to prevent settlement and basket distortion. Thin gabion mattresses are ideal
for this purpose.
Figure 75 shows a gabion groin.
Steel Fuel Barrels
Wave Height Range: Below five feet.
The use of steel fuel barrels for construction is only economical in remote arctic areas where
used barrels are readily available and they have no other salvage value. Barrel groins have worked well
where littoral transport characteristics are suitable for shore stabilization with a low groin. The barrels
should be completely filled with gravel to protect them from crushing by ice floes or from damage due to
floating debris. They should also be capped with concrete for additional strength, and entrenched to
prevent undermining by scour on the downdrift side.
Quarrystone
Wave Height Range: Above five feet.
Quarrystone, a durable and time-tested material for shore protection, should always be
considered where locally available. Figure 76 contains a typical cross section and profile of a
quarrystone groin. The stone should be sized using Equation (17) and values from Table 16. Figure 77
is a photograph of a quarrystone groin.
109
Previous Page
