Abstract
In the present paper, the hydrodynamic performance of two-segmented (200 m length, 60 m gap) submerged detached geosynthetic tube breakwaters has been compared with two-segmented traditional submerged detached rubble mound breakwaters under similar conditions, for Kadalur Periyakuppam (KPK) site. Bathymetry and wave conditions have been measured by NIOT. Tentative cost estimation of the superstructure shows that the cost of geosynthetic tube breakwaters is almost half of that of the rubble mound breakwaters and is preferred. Mike21 PMS and EMS modules have been used to simulate and compare the wave transformation under overtopping conditions for porous structures. PMS can predict diffraction accurately if wave action is perpendicular to structure, for an impermeable structure. EMS can simulate diffraction and can account for permeability and reflection characteristics, on a scale from (1, 0) to (0, 1) by externally feeding corresponding friction factor values into the numerical model. The amount of Kt or Kr cannot be predicted by the model itself as these are depth-averaged 2D models. Both the modules treat the structure as emerged only, and there is no direct provision for including the overtopping effects of submerged structures. In this paper, an attempt is also made to include overtopping effects externally (indirectly) into the model. The Kt values under different hydrodynamic conditions d’Angremond et al. (25th International Conference on Coastal Engineering, Orlando, Florida, 1996 [2]), Pilarczyk (Proceedings of 6th international conference on coastal and port engineering in developing countries, Colombo, Sri Lanka, 2003, [11]) have been fed appropriately, and the variation of leeside wave height with respect to water levels (CD vs. HWL) and type of structure (rubble vs. geosynthetic tube and impermeable-PMS) and the breaking characteristics are quantified.
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Kalyani, M., Kiran, A.S., Ravichandran, V., Suseentharan, V., Jena, B.K., Ramana Murthy, M.V. (2019). Wave Transformation Around Submerged Breakwaters Made of Rubble Mound and Those Made of Geosynthetic Tubes—A Comparison Study for Kadalur Periyakuppam Coast. In: Murali, K., Sriram, V., Samad, A., Saha, N. (eds) Proceedings of the Fourth International Conference in Ocean Engineering (ICOE2018). Lecture Notes in Civil Engineering , vol 23. Springer, Singapore. https://doi.org/10.1007/978-981-13-3134-3_25
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DOI: https://doi.org/10.1007/978-981-13-3134-3_25
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