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Depending on its size and installed power, a Cutter Suction Dredger (CSD) is capable of cutting silts, clays and fractured or solid rocks. Due to their high precision, CSDs can be utilised for a variety of tasks including navigational channel deepening, port construction and pipeline trenching among others. But despite being considered relatively efficient, CSDs can spill significantly and from simultaneous sources. A team of authors from Delft University of Technology and Great Lakes Dredge & Dock classifies the concurrent sources of CSD spillage as well as identify model parameters to estimate sand spillage within a 5 percentage point bandwidth of the experimental data. A dimensionless velocity ratio proposed by Steinbusch et al. (1999) and Dekker et al. (2003) is adapted as a governing number for model calibration, and experimental data for sand from Miltenburg (1983) and rock from Den Burger (2003) is used. The result is a analytical model for a priori computation of spillage due to high rotational velocity-induced flow.
By viewing routine processes and situations through a continuous lens of safety, individuals can help make operational processes on water or land safer. Eight solutions nominated for IADC’s Safety Award demonstrate the benefit of this approach.
It takes a commitment from many key players to make sustainable marine infrastructure a reality. If clients, contractors and stakeholders make choices which support this commitment, then water infrastructure can be sustainable. There are many decisions to be made during a marine infrastructure project, and each one leads the project down a different path. And not all paths lead the project to a sustainable destination.
Guided by the comprehensive volume, users will be able to realise sustainable infrastructure through the latest methods and supporting data.
Dredging activities can be risky operations with hidden dangers amongst heavy machinery. In response, the dredging industry proactively maintains a high level of safety standards. IADC is committed to promoting safety in the industry. A representative of contractors in the dredging industry, the global organisation encourages its own members as well as non-members participating in the global dredging industry to establish common standards and a high level of conduct in their worldwide operations. The IADC’s members are committed to safeguarding their employees, continuously improving to guarantee a safe and healthy work environment and reducing the number of industry accidents and incidents to zero.
When individual employees, teams and companies view everyday processes and situations through a continuous lens of safety, they can each contribute to making all aspects of operational processes, whether on water or land, safer.
Mooring activities are one of the activities in our sector that are considered as a high risk task. One of our employees came up with the idea of ‘mooring rope handles’ to make the handling of mooring ropes easier and safer. The handles – attached to the mooring eye – are keeping the hands of the crew member out of the ‘risk zone’ during (un)mooring activity. These handles are inexpensive and easy to apply to existing ropes. The use of those handles reduces the risks of injuring fingers or hands between the bollards and ropes activity. Mooring handles could also be a solution for a more extensive group of users outside the dredging industry. The idea should become a new safety standard within the industry. We challenge the suppliers to provide ropes with pre-attached handles.
During dredging, debris can fill the trailing draghead of trailing suction hopper dredgers. When the suction pipe is recovered on board, debris that was stuck in the draghead will fall onto the deck. To safely be able to remove this debris, Van Oord developed an automated debris removal system to reduce the risk of personal injury.
There are infinite situations which can be considered risks to safety in dredging projects. That’s why Jan De Nul introduced a critical operations campaign to increase awareness around the most serious risks which have historically resulted in the worst incidents. These are identified as working at height, lifting operations, tasks requiring lock out and tag out, site traffic, defining no-go areas, marine navigational awareness and marine transfer of personnel. Specifically, the critical operation ‘Lock Out, Tag Out’ (LOTO) contributes to safety in the sector as it is a control measure present industry-wide.
Dredge pumps experience extreme forces during operation, requiring a robust piece of equipment to combat them. Failure of this connection can impact a project’s efficiency or in the worst case, crew. The advent of the double-walled pump improved safety and reliability, marking a major step forward compared to the formerly prevalent sheet steel pump casings.
During the course of a project, attention and priorities can shift, but one thing is certain: safety results from successful projects and vice versa. Jan De Nul Group acknowledges that proper preparation and keeping control makes all the difference in ensuring a successful project. That’s why the company conceived ‘Imagine Think Act’ (ITA) which has a dedicated website and regular newsletter messages to employees. A company-wide programme, ITA’s strategy is to approach culture from an operational point of view and not as a safety culture.
To safely remove debris that will fall onto the deck after recovering the draghead of a trailing suction hopper dredger, Van Oord has developed an automated debris removal system. IADC rewarded Van Oord’s innovation with the IADC Safety Award 2018 during its Annual General Meeting in Budapest, Hungary.
During dredging, debris can fill the trailing draghead of a trailing suction hopper dredger.
For several decades, the preferred solution for isolating dredging pumps within a vessel has been the double-walled pump housing. While an improvement in both safety and reliability compared to the previous use of single-walled pumps, it still has two significant problems: it requires the pump to be raised to accommodate the casing, which has a negative impact on pump efficiency, and it adds considerably more weight to the pump assembly.
This extra weight reduces the additional payload that the dredger can take and over the years can represent a significant loss of capacity. To address this Damen has been conducting an extensive research project in partnership with its customers and materials specialists to develop a solution that can overcome these issues. The result is now available commercially and will no doubt surprise many as it is radically different to what has gone before.
Depending on its size and installed power, a Cutter Suction Dredger (CSD) is capable of cutting a wide range of soil types from silts and clays to fractured or solid rocks. Its high precision allows for utilisation in a variety of dredge operations including navigational channel deepening, port construction and pipeline trenching. In spite of being considered relatively efficient, a CSD can spill significantly. This article proposes a classification of the concurrent sources of CSD spillage as well as a analytical model for a priori computation of spillage due to high rotational velocity-induced flow. As of yet, in literature, no analytical models exist that describe spillage due to centrifugal advection.
With growing environmental awareness and increasing climate pressures on low-lying deltas, modern-day society puts incredibly strong demands on the sustainability of water infrastructure projects. Classic approaches towards the design and implementation of such projects no longer suffice in satisfying these demands. Radically different methods are needed which demand multidisciplinary project teams to adopt entirely new ways of thinking, acting and interacting. Application of these new methods results in innovative water infrastructure solutions that meet the primary functional requirements while at the same time delivering added value for nature and society as an inherent part of project development.
Battelle’s Tenth International Conference on Remediation and Management of Contaminated Sediments settles in New Orleans for a four-day forum to share research results, practical experiences and opportunities dedicated to restoring the environmental and economic vitality of waterways. As many stakeholders are needed for the management of aquatic systems due to diverse environmental, economic, political and social aspects, this conference serves as a forum to discuss these complex issues. Opportunities for networking will be integrated into the programme to facilitate interaction.
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