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(PDF) Granulometry of Mangrove Sediments
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Abstract

The grain size analyses of estuarine sediments give an idea of the depositional environment in the estuaries. Values of graphic mean size, median, standard deviation, kurtosis and skewness are determined from the cumulative curves drawn by plotting size values. The statistical size parameters of the Sunderbans estuarine sediments indicate that the estuarine banks, flanks of the mid channel bars and point bars where depositional energy is low, are characterised by muddy sediments.

Chapter 6 Granulometry of Mangrove Sediments Abstract The grain size analyses of estuarine sediments give an idea of the depositional environment in the estuaries. Values of graphic mean size, median, standard deviation, kurtosis and skewness are determined from the cumulative curves drawn by plotting size values. The statistical size parameters of the Sunderbans estuarine sediments indicate that the estuarine banks, flanks of the mid channel bars and point bars where depositional energy is low, are characterised by muddy sediments. Key Words: Sunderbans estuary, grain size, mean, median, standard deviation, kurtosis, skewness, cumulative curves 1 Sediment is made up of loose particles of sand, silt and clay. Particle size refers to the diameter of individual grains of sediment. It is a fundamental descriptive measure of sediments from any environment. Grain size analysis of estuarine sediments is required to study the trends in surface processes related to dynamic conditions of transportation and deposition. Relative proportions of sand, silt and clay determine the soil’s texture. Grain size of estuarine sediments is the characteristic feature of the size frequency distribution of sediments as well as it is a fundamental descriptive measure of sediments in the estuarine environments. It helps in the interpretation of depositional environment of clastic sediments of a deposit by parameters of their texture. The general physical appearance of an object is considered as texture. Estuarine environment is characterised by the texture of its sediments which has a relationship between texture of sediments and process of deposition. As a whole, sediment grain size is an important aspect which is related to the transport and deposition of sediments. The average size of the grains of materials in a sample also known as fragments or particle size and the general physical appearance of an object is grain Size where sand particle size varies from 0.0625 to 2 mm. Sand pertains to particles that lie between silt and granules on the Wentworth (1932) scale of grain size. Sand size class ranges from -1.0 to 4 .0 (phi). Silt is a particle size of 0.008 to 0.0625 mm. It is intermediate in size between sand and clay. Silt size class ranges from 4.0 and 8.0 (phi). Clay is a particle size between silt and colloid of various hydrous aluminum silicate minerals that are plastic, expansive, and have ion –exchange capacities. Clay size class ranges from 8 (phi) and onwards. 2








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