4. Coastal Erosion and Protection Measures Including Case Studies
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Fig. 4.23(a) Seawall Type C completed and damaged in 2010 (Panathurakkara).
Fig. 4.23(b) Coast protected using Type-1 site spécifie design (Panathurakkara).
its rôle in protecting the coast. Through a rigorous analysis of the available wave data, the longshore current velocity and its distribution across
the surf zone as per the methodology of Komar [1969]. The monthly sédiment transport has been estimated using the method of Energy Flux [CEM,
2002], the method of Komar [1969] and by integrating the distribution of
sédiments within the surf zone as suggested by Komar [1969, 1976a]. In
view of prédominant longshore drift accompanied by the cross-shore sédiment movement which was quite visible from the field observation, the
groin field was proposed with T-groins. The T-shaped groin can effectively
trap the onshore-offshore movement of the sédiments. In addition, the long
perpendicular arm of the groin can effectively trap the alongshore sédiment
movement. Following the guidelines laid out in CERC [1984], the layout
of the transitional groin field in order to ensure that the downdrift of the