Central Dredging Association

Understanding dredging

CEDA webinar archive

Flow regime diagrams in slurry transport

This webinar was the 6th webinar in the CEDA Series of Webinars on Dredging Technology. It covered the following topics: 1) Which flow regimes can be distinguished 2) When do the flow regimes occur 3) Transitions between flow regimes 4) Flow regime diagrams 5) How do the flow regimes depend on pipe diameter and concentration. Presenter: Dr. ir. Sape Miedema, Delft University of Technology, the Netherlands. Level: Practitioner. Complimentary webinar. Supported by Deltares

Presentation (PDF)


An overview of slurry transport models

This webinar was the 5th webinar in the CEDA Series of Webinars on Dredging Technology. It covered the following topics: 1) History; 2) Different types of graphs; 3) Empirical models; 4) Mechanistic models; 5) The Limit Deposit Velocity and the Limit of Stationary Deposit Velocity 6) Which model to use and when. Presenter: Dr. ir. Sape Miedema, Delft University of Technology, the Netherlands. Level: Practitioner. Complimentary webinar. Supported by Deltares



Presentation (PDF version of the PPT file)


The sedimentation process in a TSHD

This webinar was the 4th in the CEDA Series of free Webinars on Dredging Technology. It covered the following topics: 1) Intro TSHD hopper settling and flow field in the hopper 2) Definitions and factors influencing overflow losses 3) Settling velocity of particles (a. Influence of concentration; b. Influence of Particle Size Distribution); 4) Sedimentation velocity 5) Camps model to calculate overflow loss and the influence on the PSD in the hopper 6) Short overview 1DV and 2DV models. Presenter: Prof. dr. ir. Cees van RheeDelft University of Technology, the Netherlands. Level: Practitioner. Complimentary webinar. Supported by Deltares

 Presentation (PDF version of the PPT file)


Production estimation based on specific energy in sand, clay and rock. 
This webinar was the 3rd in the CEDA Series of free Webinars on Dredging Technology. It covered the following topics: 1) What equipment used in cutting processes 2) What is specific energy 3) How to determine it 4) How to determine the required cutting power 5) How to determine the cutting production if the cutting power is given 6.)Limitations 7) The relation with the hydraulic transport process. Presenter: Dr. ir. Sape Miedema, Delft University of Technology, the Netherlands. Level: Practitioner. Complimentary webinar. Supported by Deltares

Presentation (PDF version of the PPT file)


Working principles of the Trailing Suction Hopper Dredge
This webinar was the  2nd in the CEDA Series of free Webinars on Dredging Technology. After a brief introduction to the Trailing Suction Hopper Dredge, participants learned about the general layout, working principle and operational limits of this type of dredge. PresenterProf. Dr. ir. Cees van Rhee, Delft University of Technology, the Netherlands. Level: Foundation. Complimentary webinar. Supported by Deltares

Presentation (PDF version of the PPT file)


Working principles of the Cutter Suction Dredge
This webinar was the 1st in the CEDA Series of free Webinars on Dredging Technology. After a brief introduction to the Cutter Suction Dredge, participants learned about the general layout, working principle and operational limits of this type of dredge. They also got an introduction to the cutting theory of sand and rock and spillage. Presenter: Prof. Dr. ir. Cees van Rhee, Delft University of Technology, the Netherlands. Level: FoundationComplimentary webinar. Supported by Deltares.

Presentation (PDF version of the PPT file)


Adaptive management for dredging [Recorded on 19 February 2016]

This presentation, prepared on behalf of the CEDA Environment Commission, outlines concepts of integrating adaptive management (AM) for the enhancement of the environment into dredging activities (inclusive of placement / disposal / reclamation). Dredging projects are often permitted with license conditions or regulations based on an assessment of the potential environmental effects. For those dredging projects where the environmental outcome can, with less certainty, be assessed, a sequence of more intense and targeted monitoring, impact assessment and management actions might be implemented. This sequence of activities is understood as ‘adaptive management’, although various ways of implementation may exist. Presenter: Gerard van Raalte, Hydronamic / Boskalis, the Netherlands. Complimentary webinar. Supported by Deltares.

Presentation (PDF version of the PPT file)


Climate change adaptation as it affects the dredging community [Recorded on 23 October 2013]
Learn about the potential implications and adaptation measures for different types of environments, illustrated with case studies and the importance of dredging, the role of the dredging community and crucial factors for an adaptive and integrated approach. Presenter: Pol Hakstege, Technical Manager, Rijkswaterstaat, Ministry of Infrastructure and Environment, the Netherlands. Complimentary webinar.

Recording | Presentation (PDF version of the PPT file)


Underwater sound in relation to dredging [Recorded on 23 April 2013]
Learn about the effects of sound on marine life; dredging sound; documented impacts; management of sound impacts via mitigation measures. Presenter: Dr. Frank Thomsen, Senior Marine Mammal and Underwater Sound Scientist DHI, Denmark.Complimentary webinar.

Recording | Presentation (PDF version of the PPT file)