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SEA LEVEL RISE AND OVERTOPPING ON SANDY BEACH DURING MONSOON

  Conference Proceeding   Coastal And Oceanography

Author
Yannie Anak Benson, Ir. Ts. Muhammad Rizal Razali, Saiful Bahri Hamzah


Repeated waves hitting the shoreline change based on the local beach material, beach slope, and structure slope, which regulates wave overtopping. High turbulence moves sediment and gives greater forces for fine beach material migration, but deposited coarse grain. Extreme monsoon event impacts could accelerate erosion and scour due to wave runup or rundown force, as well as extend coastal flooding due to overtopping. The study explored wave runup and overtopping caused by sea level rise on Malaysia's sandy beaches as a result of monsoon influence, with monsoon regimes occurring throughout the year, with varied rainstorms intensity, storm surges, and dynamic waves. According to The National Coastal Erosion Study in 2015, being a maritime country with hydrodynamic flow from South China Sea, Andaman and Java Sea, 15% of an 8840 km shoreline currently eroding influenced by 0.67m to 0.74m sea level rise. Sea level rise impact on erosion at a sandy beach has resulted in an abundance of studies that favour physical tests on overtopping and determining wave runup under a variety of situations. The east coast of Peninsular Malaysia has the most significant wave impact on a sandy beach, rather than the west coast and West Malaysia, which need better strategies for adaptation in coping with wave regimes and conservation measures on the beach. Wave runup and overtopping is an important aspect in achieving an ideal aim of sustainable coastal zone management in conjunction with sea level rise at sandy beaches and coasts prone to monsoon waves.


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