Coastal and nearshore sediment samples of the eastern coastal zone of Bangladesh

Description

This dataset is composed of nearshore and coastal sediment from 42 samples. Samples are collected from three coastal areas in the eastern coastal zone of Bangladesh, which includes the part of the northern Bay of Bengal. 17 samples were collected from the Cox’s Bazar coast, numbered as C1 to C17; 10 samples are from the Teknaf coast, numbered T16 to T25; and 15 samples are from Saint Martin’s Island coast, numbered here as T1 to T15. Samples were retrieved from the seafloor using a Van Veen grab sampler from February 2018 to March 2019. After retrieving the samples, they were transported to the laboratory using geological sample bags. Samples were dried in the open air and taken at approximately 100g for sieving. All the samples fall below the 2 mm size of the sieve. So, six sieve meshes (1mm, 0.5mm, 0.25mm, 0.125mm, 0.063mm, and pan) were used for the determination of grain size. Sediment grain sizes were calculated using Folk and Ward (1957) formulae.

Steps to reproduce

The GIS shape file named "sediment_samples" contains several fields. Among the shape file fields, "Station_ID" represents a sample name, such as "T15" and "C17", "Latitude" and "Longitude" represent the coordinates of the sample location, and "Depth_m" represents the depth of the sample in meters. Φ5, Φ16, Φ25, Φ50, Φ75, Φ84, and Φ95 indicate sediment size values in phi size at metric units obtained from the cumulative curve. In the phi scale, "G_Mean," "S_Deviati," "Skewness," and "Kurtosis" represent mean size value, sorting, skewness, and kurtosis, respectively. The fields "Sand_" and "Mud_" show the percentages of sand and mud, respectively. The shape file can be opened using any GIS software. The MS Excel file named "Excel_data_file" contains two tabs named "Histogram" and "Cumulative" which indicate weight percentage and cumulative weight percentage, respectively, of mm and phi sediment size scale. In both tabs, "Sample ID" indicates the number of the samples, while "Phi scale" represents the scale along the row after Wentworth (1922). Very Coarse (1mm), Coarse (0.5mm), Medium (0.25mm), Fine(0.125mm), Very Fine (0.063mm), and Pan indicates sediment size in mm scale. The graphs plotted in both tabs represent the histogram and cumulative curve of grain size data.

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