Sand size variability inside the hopper of a trailing suction dredger for beach nourishment purposes

Poullet, Patricio; Muñoz-Pérez, Juan J.; López, Palmira González; García-López, Santiago; Martell, Raúl; Silva, R.; Moreno, Luís

doi:10.1007/s00367-019-00615-w

Cited by 3 publications

(8 citation statements)

References 20 publications

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“…Prior to removing the sand sample from the hopper surface, the operator took off the first 5 cm in depth from a 20 cm 2 random sand area from the surface, adhering to the appropriate safety measures. The first 5 cm from the surface usually has a high percentage of shells, and it is not representative of the whole hopper (Poullet et al, 2019a).…”

Section: Methodsmentioning

confidence: 99%

“…It is therefore important to evaluate possible errors when determining sand parameters (native and borrow) before and during the beach nourishment process, since these could entail dredging a larger volume of borrow sand than necessary. Indeed, Poullet et al (2016) studied a particular case with the James method (U.S. Army Corps of Engineers, 2002) to obtain the R A , in order to demonstrate the importance of errors made when performing sand parameter determinations in the calculation of sand nourishment volumes. Regarding the design beach nourishment projects, Grosskopf and Kraus (1993) proposed a mean error of less than 11.5 m 3 /m of beach volume to estimate the sand volume; otherwise, an accuracy comparable to the 10-20% contingencies is associated with the project designs (Muñoz-Pérez et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the design beach nourishment projects, Grosskopf and Kraus (1993) proposed a mean error of less than 11.5 m 3 /m of beach volume to estimate the sand volume; otherwise, an accuracy comparable to the 10-20% contingencies is associated with the project designs (Muñoz-Pérez et al, 2012). Thus, some authors (Grosskopf and Kraus, 1993;Muñoz-Pérez et al, 2012;Poullet et al, 2016) indicate that errors up to 10% can be assumed for beach nourishment purposes.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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%.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Dredgers are used for dredging operations. They can be dredged [1][2][3][4][5] and bucket [6][7][8][9][10][11]. Such machines are used not only in fulfilling the works on deepening the bottom, but also in the construction of channels [12][13][14], retaining walls and piers [15,16], bridges [14] and other objects [2,3,[17][18][19], as well as in the development of all types of soil and mining.…”

Section: Introductionmentioning

confidence: 99%

“…Such machines are used not only in fulfilling the works on deepening the bottom, but also in the construction of channels [12][13][14], retaining walls and piers [15,16], bridges [14] and other objects [2,3,[17][18][19], as well as in the development of all types of soil and mining. Rotary bucket dredgers are used both for dredging [20][21][22][23][24] and for mining operations [6,8,14,15,23,25]. It should be noted that rotary bucket dredgers are effective in the development of various types of soil, but are complex in design, have a large mass and high cost.…”

Section: Introductionmentioning

confidence: 99%

Construction of fairways and reconstruction of channels using rotary-bucket dredgers and calculation of soil-collecting devices

et al. 2021

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Rotary bucket dredgers are used in various operations: dredging, mining, development of all types of soil. Despite their high weight, cost and complexity of construction, they are increasingly used in underwater soil development due to their versatility and high efficiency. The article presents the developed method for calculating the rotary bucket dredgers, taking into account their placement under water.

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Microwave Drying Method before Sieving to Obtain Accuracy of Sand Size Parameters

Lopez-Garcia,

Muñoz-Perez,

Contreras-de-Villar

et al. 2024

JMSE

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The purpose of this study is to determine the differences between the size parameter findings, comparing the results of a muffle during a 12-h sand-drying process with those of a microwave, because the effectiveness of sand drying with a microwave has not previously been studied. To achieve the best outcomes and assess any inaccuracies, a technique was established. Several power levels and durations were used in the tests. Furthermore, as the median particle size (D50) affects the porosity of sand, samples from three beaches in the south of Spain with varying sand sizes were used in this study. When drying for at least 5 min, the error findings for D50 are less than 3.5%, which is perfectly acceptable for beach nourishment purposes. Regarding power, 462 watts was the optimal power; a lower power, approximately 300 watts, did not completely dry the material, even after nearly 15 min. Furthermore, errors in the sorting (σ) parameter were negligible. It is essential to implement the following recommendations in microwave drying methods: the use of a light and wide container for the sand, interruptions during drying, and a minimum duration of 5 min.

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Sand size variability inside the hopper of a trailing suction dredger for beach nourishment purposes

Cited by 3 publications

References 20 publications

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

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

Construction of fairways and reconstruction of channels using rotary-bucket dredgers and calculation of soil-collecting devices

Microwave Drying Method before Sieving to Obtain Accuracy of Sand Size Parameters

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