Error on the Estimation of Sand Size Parameters When Using Small Diameter Sieves and a Solution

Analyses were carried out to determine the main sand size parameters (median grain D 50 and sorting σ) for beach nourishment purposes using sieving method aboard a dredger. Due lack of space need carry use material with ease, sieves are commonly small (10 cm diameter), shaking procedure is usually performed by hand. However, influence shaking, either mechanically or manually, has not yet been studied 10 diameter sieves. Therefore, 20 samples taken from inside hopper trailing suction dredger sieved both manually min. The results showed that manual yielded higher values than mechanical procedure. average error arising was 14%, but it can reach 36.5%. granulometric analysis different times shown this < 5% when at least min performed. gave always finer results. In addition, overfill ratio calculated reached differences up 48%.