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Communication Dans Un Congrès Année : 2015

The Seasonal Dynamic on Beach Morphology at Open Sand Beaches in Kuala Terengganu, Malaysia

Résumé

This abstract emphasizes on the beach morphology and morphodynamic of the beach investigations at the Kuala Terengganu Beach area on July 2013 until November 2014. The monthly survey was conducted based on southwest monsoon (April to August) and northeast monsoon (October to February). The study area covers almost 5 km of the Kuala Terengganu beach area, s tretching from Universiti Malaysia Terengganu (UMT), Teluk Ketapang, to Seberang Takir beach. Beach morphodynamic have different changes on north and south of Kuala Terengganu that are affected from southwest and northeast monsoon of storm. On north of Kuala Terengganu (UMT beach), the distance of 20m-30m on monthly profiles were eroded while during the northeast monsoon there was erosion on the distance of 0-20 m. On the south of Kuala Terengganu, Teluk Ketapang beach showed accretion on 0m-20m distances on the monthly profile. While, during southwest monsoon Seberang Takir beach depicted accretion on 0-20m distance and erosion on 20m-40 m distance. However, during northeast monsoon, Seberang Takir beach got erosion on 20m-40m distance. Storms are one of the most important controls on the seasonal change of erosion and accretion on beaches. In Terengganu, Malaysia the storm is generated in the northeast and southwest monsoon, however, the strong storms are only visible in the northeast monsoon. Acoustic Doppler Current Profiler (ADCP) was placed in a shore face location to the north of coastal structures, which recorded the storms during the northeast monsoon (November 2013 to February 2014). The wave and current data were processed with the MIKE-21 model to generate one year data in order to make the comparison between monsoon seasons followed by the correlation between seasonal beach morphology changes and then the model validation, shown as 0.29 Root Mean Square Error (RMSE). Seasonal change in beach morphology is usually attributed to a variation in the incident wave energy level with calm conditions in the southwest monsoon (significant wave height=0.6m) resulting in wide beaches. However, the energetic conditions in northeast monsoon (significant wave height=1.5m) causes narrow beaches with near shore bar morphology.
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Dates et versions

hal-02381167 , version 1 (02-12-2019)

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  • HAL Id : hal-02381167 , version 1

Citer

Effi Helmy Arrifin, Mouncef Sedrati, Rosnan Yaacob, Mohd Lokman Husain, Mohd Fadzil Akhir. The Seasonal Dynamic on Beach Morphology at Open Sand Beaches in Kuala Terengganu, Malaysia. 12th Annual Meeting Asia Oceania Geoscience Society & 7th Asia Pacific of Hydrology and Water Resources (APHW), Aug 2015, Singapore, Singapore. ⟨hal-02381167⟩
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