Sediment Grain–Size Distribution Dynamics at Bangsaen Beach Between 2005 and 2014
Keywords:
Bangsaen beach, Sediment distribution, Sediment grain-sizesAbstract
A study of the sediment size distribution dynamics at Bangsaen Beach during 2005–2006 compared to 2014 revealed significant seasonal variations in coastal sediment size. In 2005–2006, Fine sand was significantly more abundant than other sediment sizes, while Very Coarse sand was abundant, interspersed with Coarse sand, and Fine and Medium sand were less abundant in 2014. Offshore Fine sand was significantly more abundant than other sediment sizes and more abundant than the shoreline in all seasons. The changes in sediment size and distribution over the nine-year period may be due to seasonal influences of wave size and current direction. The linear regression between values of sediment sorting and median size of sediment had a higher coefficient of determination during the study period, suggesting that the breakwater on the southern side of the beach affected the direction and speed of long-shore currents and seasonal currents and directly affected the movement of different sizes of sediments back and forth between the rainy and winter seasons, resulting in a sorting of different sizes of sediment. In particular, the central coast near Bangsaen Circle found sediments of moderately sorted sediments. Although this study indicates changes in sediment grain-size distribution at Bangsaen Beach over one time period, however, long-term and sustainable studies of sediment distribution, slope changes, and beach morphology are still needed to ensure that Bangsaen Beach remains equilibrium naturally and remains an important tourist attraction
in the eastern region.
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