Terra Et Aqua

Number 150 - March 2018

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Articles

Is high quality sediment monitoring worth its weight in gold?

DR JONATHAN TAYLOR, NEIL CROSSOUARD, DR MARK LEE

Dredging activities often result in the suspension of sediment into the water column in the vicinity of the activity. Sediment release to the aquatic environment and the effects of this release are often the prime environmental concern associated with dredging.

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How can the dredging sector join the global shift towards sustainability?

A paradigm shift is being increasingly embraced within the dredging industry. The traditional engineering approach is becoming a holistic approach in which the ecosystem is leading and values for people, profit and planet are integrated in an interdisciplinary manner.

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Interview: ‘Can ports face extreme vessel growth by themselves?’

The International Association of Ports and Harbors’s Patrick Verhoeven discusses the major topics facing the world’s ports as they prepare for the future as well as ways ports can adapt to the ever-growing scale increase of ships.

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1DH Model Predicts Transport and Sedimentation Inside a Hopper

JORDY BOONE, MICHEL A.J. DE NIJS

A one-dimensionalhorizontal modelling tool which accurately predicts the overflow of sediments and bed layer distribution inside the hopper of a Trailing Suction Hopper Dredger is introduced.

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cover

Trailing Suction Hopper Dredgers (TSHDs) are commonly used in the dredging industry at a wide variety of maintenance, land reclamation and maritime construction projects. During trailing suction dredging the TSHD trails dragheads over the seabed to excavate it. The loosened bed materials like sand, clay or gravel together with surrounding water are hydraulically sucked up by pumps through the trailing suction pipes. This mixture is subsequently discharged into the ship’s cargo hold called hopper.
There the suspended sediment disperses and settles throughout the hopper to form a sediment bed layer at the bottom. Simulation of the sedimentation processes in hoppers is of great interest to provide predictions of how efficiently the incoming sediment is retained in the hopper.
A prediction model developed by Van Oord engineers introduces a model to accurately and easily predict the overflow of sediments. Read more on page 33.

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