4. Coastal Erosion and Protection Measures Including Case Studies
139
The érosion and accretion is estimated from 1986 to 2002, i.e., over a
period of 16 years with the satellite imagery data using GIS software. The
rate of érosion is about 4 m per year and the accretion is 6 m per year.
The extent of érosion in the northern side is 33.59 hectares compared to
the accretion on Southern side of 30.71 hectares, see Fig. 4.27(c).
4.6.3.6 Geosynthetic products as Coastal protection measure
A stretch of the East Godavari District of Andhra Pradesh coast with several fishing hamlets (17.05°N and 82.31°E), the location of which is shown
in Fig. 4.28(a) had been experiencing perennial Coastal érosion.
It was decided to protect a portion of this stretch with geosynthetic
products. Accordingly, a scheme was drawn out during mid of 2010. The
stretch of the coast prior to the implémentation of the protection measure
is shown in Fig. 4.28(b). The cross-section with a combination of geotextile, geotube and gabions is projected in Fig. 4.28(c). The different stages
of construction starting the laying of the geotextile and completing the
section are projected in Fig. 4.28(d). It is to be noticed that a few layers
of geobags were introduced to serve as a protection for the geotube from
being damaged by the gabions. This protection measure has survived several storms, a view of which being exposed to one such event is shown
in Fig. 4.28(e).
139
The érosion and accretion is estimated from 1986 to 2002, i.e., over a
period of 16 years with the satellite imagery data using GIS software. The
rate of érosion is about 4 m per year and the accretion is 6 m per year.
The extent of érosion in the northern side is 33.59 hectares compared to
the accretion on Southern side of 30.71 hectares, see Fig. 4.27(c).
4.6.3.6 Geosynthetic products as Coastal protection measure
A stretch of the East Godavari District of Andhra Pradesh coast with several fishing hamlets (17.05°N and 82.31°E), the location of which is shown
in Fig. 4.28(a) had been experiencing perennial Coastal érosion.
It was decided to protect a portion of this stretch with geosynthetic
products. Accordingly, a scheme was drawn out during mid of 2010. The
stretch of the coast prior to the implémentation of the protection measure
is shown in Fig. 4.28(b). The cross-section with a combination of geotextile, geotube and gabions is projected in Fig. 4.28(c). The different stages
of construction starting the laying of the geotextile and completing the
section are projected in Fig. 4.28(d). It is to be noticed that a few layers
of geobags were introduced to serve as a protection for the geotube from
being damaged by the gabions. This protection measure has survived several storms, a view of which being exposed to one such event is shown
in Fig. 4.28(e).