66
25………………………………seawalls
are impermeable
,
…………………………seawalls
are
permeable
rubble
mound
structuures
armored
with …………………….rocks
or artificial
armour units. …………………………..seawalls
are a
………………….of
rubble mound seawall with a rigid impermeable wall .
During
low tide the structure will act as………………………….and during high
tides it acts as ……………….. wall type.
26Groins are ………………………….and ……………………..structures
positioned
on eroding beaches to …………………..sand artificially
and to promote……………………..
The alignement of groins
is
usually ……………………to the shore , it can also be …………………….at
a specific angle for…………………..purpopses .
27Jetties are built to ……………………..sediment deposition at
the mouth of ……………………, estuaries , tidal inlets due to
longshore drift of ………
28Revetments
are
structures
used
to
improve
…………………….of sloping surfaces along the shore , they can be
made up by ……………stones , …………………blocks , or even
…………………………….
29Soft structures are made with ……………..products.
30Geosynthetics man-made …………………..used to improve
soil……………………….They are …………………………..products used to
solve ……………………….problems.
31As
water-permeable
geosynthetics
,………………………are
suitable for ………………….. , drainage and……………………………..of
soils with different ……………………………composition , becaus ethe
fibers and geotextile products possess certain……………………., they
can resist and transfer …………………
32Artificial
reefs are underwater ……………….that are
submerged
under the surface of the sea. Different
kind of
materials can be used in the construction of artificial reefs such
as ; ………………..cars , airplanes
, military …………………….. ,
car………………………., oil……………………etc
33Soft
measures
do
not
leave
behind
……………………….or…………………………..or ecological foot print.