Section
Physical Sciences
Abstract
Grain size distribution on the seabed and in the suspension were determined on an intertidal sandbank in Menai Strait, U.K. to establish both the mode of deposition and its stability against the strong tidal flows prevailing in the strait. Granulometric analysis showed typically three sediment population (log plot of cumulative curve) in the size range 4.0-3.0 phi and 1.5-1.0 phi with the middle on making the largest in all the samples. A probability plot of the cumulative curves however revealed on the average the lower (coarse) and upper (fine) truncation points to be lying at 1.5 phi and 3.0 phi respectively. The 1.5-2.5 phi population was therefore found to belong to the “intermittent suspension” load and made the framework of the deposit. Materials (sand grains and shell fragmens) finer than 1.5 phi were characteristically found in suspension. Since the two populations (finer than 1.5 phi) forms the largest part of the bet sediment and are easily taken into suspension these two features explain the existing high morphological variability of the sandbank.
Recommended Citation
NYANDWI, N.
(1992)
"An account of sandbank depositional modes, menai strait u. K,"
Tanzania Journal of Science: Vol. 18:
Iss.
1, Article 4.
Available at:https://doi.org/10.65085/2507-7961.2410
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This work is licensed under a Creative Commons Attribution 4.0 License.
