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ABSTRACT
Ariffin, E.H.; Sedrati, M., Akhir, M.F., Yaacob, R., and Husain, M.L,. 2016. Open Sandy Beach Morphology and Morphodynamic as Response to Seasonal Monsoon in Kuala Terengganu, Malaysia. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research, Special Issue, No. 75, pp. 1032 - 1036, Coconut Creek (Florida), ISSN 0749-0208.
Understanding beach morphology and morphodynamic changes is important in regions where there is a large amount of recreation and development. Kuala Terengganu beaches has many anthropogenic infastructure such as an extension to an airport runway similar in design to a groin which affect morphology and morphodynamics in response to seasonal monsoon storms. Seasonal monsoon storms are one of the most important controls on the cycle of erosion and accretion on beaches. Beach profile data and wave modelling were used to determine the response of five beaches on the north of Kuala Terengganu to Northeast and Southwest seasonal monsoons. The beaches along the Kuala Terengganu state coast before the construction of the airport extension exhibited a classical morphodynamic response. This includes erosion during Northeast monsoon and accretion/recover during Southwest monsoon. The airport construction disturbed and changed normal coastal evolution. Two distinct sediment cells were generated, each having developed a proper morphodynamic response within the Northeast and Southwest monsoon wave regimes.
ADDITIONAL INDEX WORDS: Beach Morphology and Morphodynamic; Northeast Monsoon Storm.
INTRODUCTION
The open sandy beach is a natural sediment buffer for coastal systems. Erosion and accretion this buffer are correlated with high and low energy wave conditions. High energy waves erodes sand from the beach, while low energy waves supplies causes it to accrete. Stive et al. (2002) created a storm model which predicts rapid sediment erosion during storms and subsequent slower accretion in the post-storm period. This model may be applied to natural areas expressing a seasonal variable wave energy regime. However, anthropogenic impacts on coastal areas (eg Harbor jetties, groins and breakwaters) may affect sediment supply and transport. The coastal areas under both natural and anthropogenic impacts can suffer from severe erosion as the case of Taiwan and Sulawesi (Indonesia) coasts (Hsu et al., 2007) and Umar et al., 2015).
The coast of Peninsular Malaysia can be divided...