Abstract
Sonadia is one of the most important islands of Bangladesh. South-eastern shore of the island, which is a growing sand bar, has to encounter continuous and rapid morphological changes. So study of the sediment characteristics of this Sand Bar is very important. In the present study, grain size analysis of this Sand Bar has been done on the basis of laboratory analysis. Sediment samples were collected from 9 (Nine) stations and texture analysis of sediment was completed following a standard procedure of sieve analysis of sand samples. The average value of median (MD), mean (M), standard deviation (s), skewness (SK) and kurtosis (K) of sediment of the Sand Bar of Sonadia Island was 1.93, 1.87, 0.44, 0.11 and 1.88 respectively. Highest median, mean, standard deviation, skewness and kurtosis of Sand Bar of Sonadia Island was 2.98 (Station 2, Lower Shore), 2.68 (Station 1, Lower Shore), 0.83 (Station 1, Middle Shore and Station 2, Lower Shore), 0.65 (Station 2, Lower Shore) and 3.59 (Station 1, Lower Shore) respectively. Lowest median, mean, standard deviation, skewness and kurtosis of Sand Bar of Sonadia Island was 1.42 (Station 9, Middle Shore), 1.45 (Station 9, Middle Shore), 0.30 (Station 5, Lower Shore and Station 8, Lower Shore), 0.04 (Station 5, Upper Shore) and 0.94 (Station 6, Upper Shore) respectively.
Highlights
Bangladesh is considered as the largest deltaic plain of the world of three mighty rivers, namely the Ganges, the Brahmaputra and the Meghna commonly known together as GBM
These sediments interact with dynamic process in the Bay of Bengal leading to coastal geomorphological changes [4]
Grain size distribution of sediment is a fundamental property of sediment
Summary
Bangladesh is considered as the largest deltaic plain of the world of three mighty rivers, namely the Ganges, the Brahmaputra and the Meghna commonly known together as GBM. Along with GBM, the major river systems in Bangladesh are mainly originated from the Himalayas which are situated in the north to the Bengal delta. This is mainly due to denudation of the Himalayas resulted in the formation of the world’s largest delta which is still active at a rate of about 70 cm per one thousand years [1,2]. GBM carries a total of about 2.4 billion tons of sediments per year [3] into the Bay of Bengal. A huge amount of sediments are thought to be carried by under currents into the deeper Bay of Bengal and the Indian Ocean
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