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Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT Industrial area Ha 33 Breakwaters m 4,630 Rubble mound m 2,140 Vertical m 2,490 Dredging and reclamation Cu.m 10,123,273 Table 3. Main elements and figures of the port In the following chapters the criteria followed in the planning of Phase 1 of the port's installations and its principal characteristics is explained. There is also an advance of the principal characteristics of Phases 2 and 3, which covers up to 2030. 2.3.1. Breakwaters a) General • The main breakwater should be located around the -20.0 m depth line, so that the vessel channel does not require much initial or maintenance dredging. • The main breakwater should be perpendicular to the main waves. This means a NW-SE orientation. • To gain the expected depth, a breakwater approximately perpendicular to the coast should be constructed. This breakwater should have a N-S orientation, to allow wave incidence on the shore and, thus, allow the littoral drift and cleanness of the beaches. • Between the 0 and -15.0 m depth line, a rubble mound-type breakwater, armoured with accropode or cubipod concrete units is the most economic type, while for deeper waters, a vertical breakwater made by concrete caissons is the cheapest solution. b) Cross sections For the breakwater design, a 200-year return period has been considered. This means 5.0 meters of wave height and a 11.5-second wave period. As mentioned above, both rubble mound and vertical breakwaters have been preliminarily calculated. The results can be seen on the next figures. CP1832-FR-AX-05-CP-Initial Environmental Examination-Ed4.docx AX05 - 19 www.tamilri.com
Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT • Rubble mound breakwater Figure 9 Rubble mound breakwater The armour layer on the seaside consists of 12-ton accropods, a 1-2 ton rock underlayer and a core of 50-150 kg of quarry run. On the port side, the armour layer consists of rocks of 1-2 tons. • Vertical breakwater The vertical breakwater is made of floating concrete caissons filled with sand. For the toe protection, the same 1- 2 ton rocks will be used, while the caissons will be 23 meters wide and 24 meters tall. Figure 10: Vertical breakwater CP1832-FR-AX-05-CP-Initial Environmental Examination-Ed4.docx AX05 - 20 www.tamilri.com
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