Modelling the waterjet cable trenching process on sand dunes

Cables for offshore wind farms in the North Sea are buried for protection. A highly variable seabed topography influences the trenching process in sandy soils. A model has been developed to estimate the influence of sand dunes on the trenching process.

Numerical investigation of the head and unsteady flow characteristics of a dredge pump loading high-concentration sands

The head of a dredge pump is an important performance parameter and a strongly fluctuating head may affect the operating stability of the pump unit. The IADC Young Author’s Award paper analyses unsteady characteristics of pump performance to improve control of the dredge pump.

Carbonate sand fill
Carbonate sand fill

The properties of carbonate sand are different than more commonly used quartz sands and its behaviour must be considered when using it for fill.

Important Engineering Properties of Geotextile Sand Containers
Important Engineering Properties of Geotextile Sand Containers

No proper design guidelines based on sound science are available for the design of GSC structures. This IADC Young Author Award paper describes on-going research which aims to remedy this.

Hydraulic Transport of Sand/Shell Mixtures in Relation with the Critical Velocity
Hydraulic Transport of Sand/Shell Mixtures in Relation with the Critical Velocity

When pumping shells through a pipeline, a much higher velocity is required to make them erode and go back into suspension, because although the settling velocity of shells is much lower than equivalent sand particles, the erosion velocity is much higher.

Reclamation on Soft Subsoil by Spraying Thin Layers of Sand: The "IJburg" Project near Amsterdam
Reclamation on Soft Subsoil by Spraying Thin Layers of Sand: The “IJburg” Project near Amsterdam

The question is: How do you create a stable platform when reclaiming sand on a very soft subsoil? Removing the subsoil or placing large amounts of geo-textiles are costly. The answer is: A new method using a custom-built spray pontoon which has proven efficient and economically viable.

Assessment of Offshore Sand and Gravel for Dredging
Assessment of Offshore Sand and Gravel for Dredging

Offshore sand and gravel at depths of -60 metres form an important economic resource. Accurate assessment of these offshore deposits are important to prevent environmental problems, conflicts and delays.

Calculation of Sand Losses During Hopper Loading Process in Trailers
Calculation of Sand Losses During Hopper Loading Process in Trailers

The process that takes place in the sedimentation tanks of water treatment plants is similar to the hopper loading process and can provide a theoretical model for trailing suction hopper dredgers.