Analyzing the boundary conditions of the innovative technique of agitation dredging, the Tiamat

Sedimentation is a common issue in navigating through channels, berths and anchorages of many ports and harbors. In order to address this issue, maintenance dredging can be done in three different ways; relocating of the sediments, keeping the sediments in place, or dredging with nature and using the natural currents to remove sediment. Trailing...

Feasibility Study of Implementing a Central Suction-WID System in a Tide-Dominated Channel

The feasibility of installing a suction system, which consists of a pump and pipeline for transporting sediment from the sediment trap to the reallocation site to complement the water injection dredging (WID) method is accessed in this thesis. The combination of a suction system and a water injection dredger is called central suction-WID system....

Laboratory study on the efficiency of water injection dredging: An analysis on the influence of different dredge settings on the density current and production rate

The Port of Rotterdam experiences large amounts of siltation from the upstream rivers in its basins and canals every year. Furthermore, container vessels increase in size every decade and therefore require a larger navigational depth. These two factors cause the yearly amount of dredged material to increase. Currently, mainly trailing suction...

Near-field of an experimental turbidity current triggered by an impinging water jet – a preliminary assessment

Modelling of high concentration fluid mud water injection dredging density currents

Siltation of fine (cohesive) sediment in navigation channels and harbour basins may cause serious problems for the shipping industry. Intensive maintenance dredging is required to ensure safe shipping traffic. Conventional dredging methods are highly expensive, and therefore port authorities seek for more efficient solutions to reduce costs. One...

Assessment of a Lagrangian 1DV Modelling Approach for Turbidity Currents Generated by Water Injection Dredging

Siltation affects navigation in harbors and waterways by reducing the water depth. To regain depth and safeguard navigation, dredging is required. Water Injection Dredging (WID) is one of the available hydrodynamic dredging techniques, in which pumps on a vessel inject water at high flow velocities and low pressure into the bed and fluidize the...

Water Injection Dredging and Fluid Mud Trapping Pilot in the Port of Rotterdam

As conventional dredging and relocation of sediment deposits is highly expensive, port authorities seek for more efficient solutions for reducing the costs of maintenance dredging. One of the well-known solutions is water injection dredging (WID). In general, WID is proven to be cheaper than the hopper dredging by leaving the sediment in place,...

Autonomous dredging of mud

There are many locations where the accumulation of mud poses a problem. In lakes it can have a negative influence on the ecological situation and in port basins it can hinder traffic. Usually these mud deposits are removed periodically with regular dredging vessels. Looking at the continuous nature of the mud deposition and at the trend of an...

Sedimentation in reservoirs: Investigating reservoir preservation options and the possibility of implementing Water Injection Dredging in reservoirs

Sedimentation in reservoirs is a consequence of constructing a barrier in a flowing river, which results in a decrease of the transport capacity of the river. The storage capacity of the reservoir decreases due to the accumulation of sediments and the river downstream starts to erode due to the disturbance of the sediment balance. Water...

Water injection dredging

Some twenty years ago WIS-dredging has been developed in the Netherlands. By injecting water into the mud layer, the water content of the mud becomes higher, it becomes fluid mud and will start to flow. The advantages of this system are that there is no need of transporting the mud in a hopper, and no need for a pipeline. Also from an energetic...

Jetten in slib; indringmodellering en versoepeling: Theoretisch en experimenteel onderzoek

Physical and mathematical modelling of water injection dredging and fluidisation of a sand layer.

Jetten in slib ten behoeve van waterinjectie baggeren

Waterinjectie baggeren (WIB) is een baggermethode die slechts vijftien jaar geleden is bedacht en ontwikkeld. Door middel van een patent is HAM nu nog steeds het enige baggerbedrijf dat deze winstgevende methode mag toepassen. Grote voordelen van de methode zijn de natuurlijke methode van transport door middel van zogeheten dichheidsstroming en...

Modellering van het jetten van slappe menggronden t.b.v. waterinjectibaggeren

Een eenvoudige en relatief goedkope baggertechniek voor het verwijderen van met name sliblagen (slappe menggronden van klei/zand en slib) is het waterinjectiebaggeren. Door middel van lage drukjets (0.1 MPa) wordt water met hoge snelheid (15 m/s) in de bodem gespoten waardoor de grond loskomt en opwoelt om vervolgens als een dichtheidsstroom weg...

Port expansion Shanghai

China's economy is growing rapidly. For 1997 an economic growth of 10.5 per cent is expected (source: Economic pages of de Volkskrant, December 1996). With the economic growth the demand for new industrial zones and harbour areas arises. To facilitate these demands the port authority of Shanghai faces two major problems: the shortage of free...

Waterinjectiebaggeren: Modellering van de afstroming

In 1984 en 1985 hebben proeven aangetoond dat het mogelijk is om dichtheidsstromen op te wekken van water met een hoog sedimentgehalte. Het onder lage druk (ca. 1 bar) injecteren van water in de bodem, het zogenaamde 'jetten' verdunt de bodem tot een water-sedimentmengsel. Door het verschil in dichtheid tussen het water-sedimentmengsel en het...

Waterinjectie baggeren, een vernieuwde modellering

Tijdens het waterinjectie baggeren treden verschillende processen op. Om te beginnen wordt water met behulp van het baggerwerktuig in de bodem van het te baggeren gebied geinjecteerd, vandaar de naam waterinjectie baggeren. Vervolgens treedt menging van het water uit de straal met bodemmateriaal en omgevingswater op. Op deze manier ontstaat een...