The importance of flocculation in dredge plume modelling

Numerical models are often used to predict the magnitude and behaviour of dredge plumes to help assess and manage any environmental risks. To provide a realistic prediction of plumes resulting from dredging, numerical models require information on the rate at which sediment is suspended by the dredging, along with the characteristics of the suspended sediment. Previous investigations have shown that in the marine environment, fine-grained sediment suspended by natural processes and dredge-related activities are typically present as aggregated particles known as flocs. This article considers the importance of including the process of flocculation in dredge plume models.

Can a preliminary model describe CSD spillage due to centrifugal advection?

Depending on its size and installed power, a Cutter Suction Dredger is capable of cutting a wide range of soil types. Although precise and relatively efficient, a CSD can spill significantly. The authors propose a preliminary model which describes spillage due to centrifugal advection.

Safe Disposal of Dredged Material in a Sensitive Environment

A state-of-the-art 3D plume model, used at the Ras Laffan Port Expansion project, simulates alternative disposal scenarios and helps develop Safe Disposal Maps.

Conceptual Model for Partnering in the Dredging Industry

Partnering can be a tool for increasing co-operation and sustainability during high-risk maritime construction and dredging projects. A model helps to determine when and if applying partnering is appropriate.

An Analytical Approach to the Sedimentation Process in Trailing Suction Hopper Dredgers

A number of theories are used (Camp, Groot, Miedema and Vlasblom, Yagi, Braaksma, Ooijens and van Rhee) to determine the overflow losses when loading trailing suction hopper dredgers. The model derived here has several important improvements, including the speed of doing the calculations.

A Computationally Efficient Model for Predicting Overflow Mixture Density in a Hopper Dredger

Creating accurate models for the prediction of overflow losses by trailing suction hopper dredgers is an invaluable tool in determining the feasibility of land reclamation.

Morphodynamic-Numerical Simulations of Dredged Matter Open Disposal

This study analysing changes in the bottom-topography at dredged material disposal sites and the interaction between disposed matter and the surrounding density currents received the IADC Award at the CEDA Dredging Days.

Wind-Wave Induced Oscillatory Velocities Predicted by Boussinesq Models

An IADC "Most Promising Student" Award has been presented to a graduate of TU Delft for her work on determining the magnitude and direction of wave-induced sediment transport.