Influence of Di erent Sieving Methods on Estimation of Sand Size Parameters

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2019-05Department
Física Aplicada; Ingeniería Industrial e Ingeniería CivilSource
Water 2019, 11, 879Abstract
Sieving is one of the most used operational methods to determine sand size parameters
which are essential to analyze coastal dynamics. However, the influence of hand versus mechanical
shaking methods has not yet been studied. Herein, samples were taken from inside the hopper of
a trailing suction dredger and sieved by hand with sieves of 10 and 20 cm diameters on board the
dredger. Afterwards, these same samples were sieved with a mechanical shaker in the laboratory on
land. The results showed di erences for the main size parameters D50, standard deviation, skewness,
and kurtosis. Amongst the main results, it should be noted that the highest values for D50 and
kurtosis were given by the small sieves method. On the other hand, the lowest values were given by
the mechanical shaker method in the laboratory. Furthermore, standard deviation and skewness did
not seem to be a ected by the sieving method which means that all the grainsize distribution was
shifted but the shape remained unchanged. The few samples that do not follow these patterns have a
higher percentage of shells. Finally and definitely, the small sieves should be rejected as a sieving
method aboard.