Analyses were carried out to determine the main sand size parameters (median grain size D₅₀ and sorting σ) for beach nourishment purposes using the sieving method aboard a dredger. Due to a lack of space and the need to carry and use the material with ease, the sieves are commonly small (10 cm diameter), and the shaking procedure is usually performed by hand. However, the influence of shaking, either mechanically or manually, has not yet been studied with 10 cm diameter sieves. Therefore, 20 samples were taken from inside the hopper of a trailing suction dredger and sieved both manually and mechanically for 10 min. The results showed that manual sieving yielded higher D₅₀ values than the mechanical procedure. The average error arising from using the manual method was 14%, but it can reach 36.5%. The granulometric analysis carried out for different shaking times has shown that this error is < 5% when at least 20 min of shaking is performed. The mechanical procedure gave always finer sand results. In addition, the overfill ratio calculated for both mechanical and manual results reached differences of up to 48%.

使用挖泥船上的筛分方法进行分析以确定用于海滩营养目的的主要沙子尺寸参数（中值粒度 D ₅₀和分选 σ）。由于空间不足，需要方便携带和使用材料，筛子通常很小（直径 10 厘米），并且通常用手进行摇动过程。然而，尚未用 10 厘米直径的筛子研究机械或手动摇动的影响。因此，从拖吸式挖泥船的料斗内取出 20 个样品，并手动和机械筛分 10 分钟。结果表明，手动筛分产生更高的 D ₅₀值高于机械程序。使用手动方法产生的平均误差为 14%，但可以达到 36.5%。对不同摇动时间进行的粒度分析表明，当进行至少 20 分钟的摇动时，该误差小于 5%。机械程序总是给出更细的砂结果。此外，针对机械和手动结果计算的溢出率差异高达 48%。