164
Coastal Engineering: Theory and Practice
When good rock is available but the blocks are not large enough then
its best to go with Type S but the armour should consist of concrète blocks
in order to hâve stability. The Type S breakwater can be used when there
is a short breakwater or small vessels like fishing boats, pleasure crafts are
at harbour entrance.
Type V
When there is a reasonably good foundation but lack of good rocks, then
we can choose either Type V if d < 15 m or Type C if d > 15 m.
The caisson Type V breakwater can be preferred for the following conditions such as, bad weather ail year or rapid change in wave conditions,
bad weather for several months and also when the offshore breakwater is
with berth on lee side.
Type V is more suitable for condition which require enhanced sédiment
bypass at the harbour.
Based on labour availability, if there is cheap skilled labour then caisson
breakwater can be preferred for easy installation whereas if costly labour
is available with low cost equipment then rubble-mound is the best option.
Typical view of the breakwater fronted with rubble mound of Chennai Harbour, India during the attack of a storm in 2003 is projected
in Fig. 5.3.
Fig. 5.3 \ iolent wave attack on the composite breakwater of Chennai port in
late 2003.
Coastal Engineering: Theory and Practice
When good rock is available but the blocks are not large enough then
its best to go with Type S but the armour should consist of concrète blocks
in order to hâve stability. The Type S breakwater can be used when there
is a short breakwater or small vessels like fishing boats, pleasure crafts are
at harbour entrance.
Type V
When there is a reasonably good foundation but lack of good rocks, then
we can choose either Type V if d < 15 m or Type C if d > 15 m.
The caisson Type V breakwater can be preferred for the following conditions such as, bad weather ail year or rapid change in wave conditions,
bad weather for several months and also when the offshore breakwater is
with berth on lee side.
Type V is more suitable for condition which require enhanced sédiment
bypass at the harbour.
Based on labour availability, if there is cheap skilled labour then caisson
breakwater can be preferred for easy installation whereas if costly labour
is available with low cost equipment then rubble-mound is the best option.
Typical view of the breakwater fronted with rubble mound of Chennai Harbour, India during the attack of a storm in 2003 is projected
in Fig. 5.3.
Fig. 5.3 \ iolent wave attack on the composite breakwater of Chennai port in
late 2003.