Textural Characteristics and Depositional Regime of the Shitalakshya River Sediments, Bangladesh

IF 1.2 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geofluids Pub Date : 2024-10-30 DOI:10.1155/2024/1957253
Sohag Ali, Mrinal Kanti Roy, Md. Mahmodul Islam, Zillur Rahman, Faruk Ahmed, Abdul Alim, Md. Yeasin Arafath
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Abstract

This study analyzes the depositional regime and textural properties of the sediments from the Shitalakshya River in Bangladesh, enabling us to comprehend how these sediments evolved in a river environment. For this investigation, 30 representative samples were taken from the Shitalakshya River, and their textures were analyzed. The cumulative frequency curve is obtained by using semilog graph paper to plot particle size (in phi scale) against cumulative percent. The statistical parameters such as median (Md), mode (Mo), mean (MZ), standard deviation (σi), skewness (SKi), and kurtosis (KG) were calculated using the percentile of phi values (1%, 5%, 16%, 25%, 50%, 75%, 84%, and 95%). The cumulative curves show that the sediments are deposited through the traction population (1.90%), saltation population (75.64%), and suspension population (22.46%). The median value varies between 0.7Ø and 4.85Ø, with an average of 2.738Ø indicating coarse sand to coarse silt. The analyzed samples have unimodal, bimodal, and polymodal distribution, which indicates the sediments are carried by different tributaries and distributaries in the Sitalakshya River system. The range of 1.46Ø–4.05Ø represented by the observed mean value suggests sand with medium to extremely fine grains. Most of the sediments indicate moderate sorting, which is shown by the standard deviation (sorting), which ranges from 0.399Ø to 1.48Ø. The skewness value ranges between −0.01Ø and 0.66Ø, suggesting near symmetrical skewed, while the kurtosis value ranges from 0.54Ø to 1.87Ø, indicating the sediments are 20% leptokurtic, 20% mesokurtic, and 60% platykurtic. According to the CM plot, the Shitalakshya River is mostly deposited in the area between the rolling and suspension fields, indicating a transportation regime of saltation. The scatter plots of skewness versus sorting and graphic mean versus sorting indicate that the sediments fall within the river sand zone. The energy process discriminant functions of the sediments show that they were deposited by a fluvial process.

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孟加拉国希塔拉克什亚河沉积物的纹理特征和沉积制度
本研究分析了孟加拉国希塔拉克什亚河沉积物的沉积机制和纹理特性,使我们能够理解这些沉积物是如何在河流环境中演变的。本次调查从 Shitalakshya 河中提取了 30 个代表性样本,并对其纹理进行了分析。累积频率曲线是用半对数图纸绘制出颗粒大小(以 phi 为单位)与累积百分比的关系曲线。利用 phi 值的百分位数(1%、5%、16%、25%、50%、75%、84% 和 95%)计算出了中位数 (Md)、模式 (Mo)、平均值 (MZ)、标准偏差 (σi)、偏斜度 (SKi) 和峰度 (KG) 等统计参数。累积曲线显示,沉积物是通过牵引种群(1.90%)、盐渍化种群(75.64%)和悬浮种群(22.46%)沉积的。中值介于 0.7Ø 和 4.85Ø之间,平均值为 2.738Ø,表明为粗砂至粗粉砂。所分析的样本具有单模态、双模态和多模态分布,这表明沉积物是由西塔拉克夏河水系的不同支流和分流携带的。观测到的平均值范围为 1.46Ø-4.05Ø,表明砂粒从中等到极细。大多数沉积物显示出中等程度的分选,标准偏差(分选)从 0.399Ø 到 1.48Ø不等。偏度值介于-0.01Ø和 0.66Ø之间,表明近乎对称偏斜,而峰度值介于 0.54Ø和 1.87Ø之间,表明沉积物中 20%为左曲,20%为中曲,60%为右曲。根据 CM 图,希塔拉克什亚河主要沉积在滚动场和悬浮场之间的区域,表明盐化的运移机制。偏度与排序的散点图和图形平均值与排序的散点图表明,沉积物属于河沙区。沉积物的能量过程判别函数表明,沉积物是由河流过程沉积而成的。
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来源期刊
Geofluids
Geofluids 地学-地球化学与地球物理
CiteScore
2.80
自引率
17.60%
发文量
835
期刊介绍: Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.
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