Grain Size Distribution of the Sediments from Odi River, Bayelsa State, Nigeria

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  •   Edirin Akpofure

  •   Desmond Eteh

Abstract

Ten samples from Odi River bed were collected by divers at different locations and sent to the laboratory for granulometric analysis. Samples were dried to remove moisture content and poured into a set of BSS standard sieves and mechanically vibrated for at least fifteen minutes to enable the grains to separate into their different sizes. Textural and statistical parameters were then calculated from the results of the particle size distribution. The result shows that the grain size ranges from -2 φ – -1 φ (granules) to 3 φ – 4 φ (very fine sand). The average mean of the population is 0.89 φ, with a modal class in the 1 φ – 2 φ size grade. The average sorting value is 1.26 σ which indicates a poorly sorted population. Skewness varies through the population, but, the average skewness is -0.16 (Negatively skewed). 60% of the sediments range from leptokurtic to extremely leptokurtic, 10% are very platykurtic, 10% are platykurtic and 20% are mesokurtic. Traction and saltation transport modes were inferred from the cumulative curves of the sediments. The plot of skewness versus kurtosis shows the energy of deposition to be fluctuating between high and low, depositing coarse and fine sands facies respectively. The grain size distribution is observed to be finer downstream. 


Keywords: Cumulative curves, Depositional Energy, Frequency plots, Grain size, Mean, Sorting

References

Davies JC. Statistics and Data Analysis in Geology. Wiley and Sons, New York, 1986, pp. 190–198.

Reinneck HE and Singh IB. Genesis of laminated sand and graded rhythmites in storm – sand layers of shelf mud. Sedimentology, 1972;18:123–128.

Folk RL. A Review of grain size parameters. Sedimentology, 1966;6:73–93.

Waugh D. Geography: an integrated approach. 2nd ed. Nelson, Glasgow, UK, 1995, p. 593.

Inman DL. Sorting of sediments in the light of fluid mechanics. Journal of Sedimentary Petrology, 1949;19:51–70.

Allen JRL. Late quaternary Niger Delta and adjacent areas: sedimentary environments and lithofacies. American Association of Petroleum Geologists Bulletin, 1965;49(5):549–600.

Folk RL, Ward W. Brazos River Bar: a study of the significance of grain size parameters. Journal Sedimentary Petrology, 195727:3–26.

Harasimiuk M.Vistulian glacial cycle of the fluvial processes development in the valley of Middle Wieprz River (SE Poland). Annales UMCH, 1991;46:81–109.

Ludwikowska-Kędzia M. Ewolucja środkowego odcinka doliny rzeki Belnianki w późnym glacjale i holocenie. (Evolution of the Middle Segment of the Belnianka River Valley in the Late Glacial and Holocene) Dialog press, Warsaw, 2000, 180 pp.

Stewart HB Jr. Sedimentary reflections on depositional environments in San Migue Lagoon, Baja, California, Mexico. American Association of Petroleum Geologists Bulletin, 1958;42:2567–2618.

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How to Cite
Akpofure, E., & Eteh, D. (2022). Grain Size Distribution of the Sediments from Odi River, Bayelsa State, Nigeria. European Journal of Environment and Earth Sciences, 3(3), 5–12. https://doi.org/10.24018/ejgeo.2022.3.3.285