Author(s): Sanjeewa Wickramaratne; Sujeewan Gajasinghe; Sarada Gunasekara
Linked Author(s): Sanjeewa Wickramaratne
Keywords: Breakwater stability Overtopping performance 2D physical model
Abstract: This paper presents findings of a 2D physical model study conducted to assess the hydraulic performance of proposed north breakwater for a new harbour development on Uthuru Thila Falhu (UTF) Island in the Maldives. Strong monsoonal impacts including swells of the Indian Ocean, although being hampered partially by shallow reefs of ample presence, could still stand as significant driving force of the nearshore hydrodynamics. Therefore, the breakwater design is rightfully resorted to a prior verification through a comprehensive physical modeling study that included 2D and 3D testing of breakwaters. The paper showcases 2D (flume) testing and related lessons learnt during the process. The testing considered two critical breakwater sections. These sections were subjected to design and extreme conditions with waves generated inline with JONSWAP spectrum at a 1:20 scale, where wave impacts, overtopping rates, and structural stability were evaluated. The results demonstrated that both sections maintained their structural integrity under the conditions tested, with overtopping discharges and hydraulic pressures remaining within acceptable limits. The study concludes that the proposed breakwater design is robust but recommends further 3D model testing to address limitations inherent in 2D modeling, particularly for complex wave interactions at breakwater roundheads. The findings provide crucial data to inform final design adjustments, ensuring the safety and performance of the breakwater under prototype conditions.
Year: 2025