Grain-Size Distribution of Surface Sediment in the Inner Gulf of Thailand
Abstract
Grain size distribution of surface sediment in the inner Gulf of Thailand was studied with the hypothesis that the grain size distribution would vary with the amount of river discharge in the inner bay, seasons and oceanographic conditions. Field excursion during June 2017, October 2017 and April 2018 had yielded 12, 13 and 20 bottom sediment samples respectively. The samples were later analyzed using sieving and pipette methods. The results showed that the sediment grain size in the inner bay varied with seasons from silty sand to silty clay. The suspended fine-grain sediment was carried out to the bay by the river discharge during rainy season or resuspended from the sea bottom or the inner coast. Sand sediment was found at the mouth of the inner gulf with the sources coming from the ancient coast or deposition from the ancient rivers. D50 of surface sediments varied from clay to very fine sand while arithmetic mean () varied from mud to coarse sand. Sediment sorting was poor. Analysis of variances significantly () indicated that sediment grain size differed from fine grain in the inner bay to sand at the mouth of the inner Gulf and the sediment grain size in the inner bay differed from season to season.
Keywords : surface sediment, inner Gulf of Thailand
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