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Swart, R.N. (author)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...master thesis 2015
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Huis in 't Veld, M.L.H. (author)In the region of the Riau Islands of Indonesia fresh water scarcity is one of the challenges the local community is facing. In order to increase the catchment of fresh water the choice is made to turn Bintan Bay, part of the Riau Islands, into a fresh water reservoir. Hereby collecting the fresh water runoff from local rivers. It is however...master thesis 2015
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Crum, S. (author)In the context of the project "Widening of the Juliana Canal" a bottom protection layer is designed by dredging contractor de Vries & Van de Wiel Kust en Oeverwerken. Because part of the channel is embedded in gravel type soil layers and lies above ground water level, a water repellent function of this layer is necessary to prevent seepage.In...master thesis 2015
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Willems, J.A. (author)At the construction of 'Maasvlakte 2' in 2012, two sand closures were constructed. Sand is in most cases the most profiting construction material. The processes and the amount of sand losses which occur during the construction of a closure contain large uncertainties. In order to construct a closure, the production of sand has to be larger than...master thesis 2013
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Luteijn, J.M. (author)Problem definition The city Mar del Plata has one of Argentina's largest ports and biggest seaside beach resort. After the construction of the port, a steadily growing sandbank appeared in the port entrance and considerable erosion occurred on the northern beaches. To warrant the accessibility of the port, frequent maintenance dredging is needed...master thesis 2013
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- Lembrechts, S. (author) master thesis 2013
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Siteur, W.J. (author)Embedding of subsea pipelines for protection purposes is usually done in a ‘Trench – Install – Backfill’ operation. The pipeline can also be embedded after it is installed on the seabed. This method is called post-trenching. When using a trailer suction hopper dredger for post-trenching, a large water jet erodes the soil underneath the pipe...master thesis 2012
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Vessies, W.C.N. (author)The Maasvlakte II project is a joint venture between Boskalis and Van Oord. During the construction, they have measured the relative density for different kind of work methods, by making cone penetration tests. The result of those measurement is, that the measured relative density for the Maasvlakte II project is higher than the values that can...master thesis 2012
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Van de Leur, K. (author)It is common practice to protect subsea pipelines by embedding them into the soil. Trenches can be made before or after the pipelines have been laid. In the latter case, the excavation process is called post-trenching. The essence of post-trenching, as handled in this thesis, is erosion of sand by a water-jet. The literature study focused on the...master thesis 2010
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Vinke, F.R.S. (author)The effect of introducing an air film around a submerged water jet is examined in laboratory experiments. The objective is to reduce the friction forces between the water jet and the ambient fluid, making a jet potentially more effective at a larger distance. The test are conducted at a physical scale comparable to dredging practise, contrary to...master thesis 2009
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Van Aalderen, M.W. (author)Royal Boskalis Westminster nv is an international group with a leading position in the world market for dredging services. In most practical cases a jet installation or a big discharge aperture is used for the fast unloading of a load of sand. When a relative small discharge opening, without the use of a jet installation, is used to unload a...master thesis 2009
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van Eekelen, E.M.M. (author)The overflow mixture of hopper dredgers contains fine sediment which when released in the environment forms a so-called plume. The spreading of this sediment and the related turbidity increase and sedimentation pattern can be of environmental importance. Understanding the behaviour of these plumes is therefore important. The first phase of the...master thesis 2007
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Frankenmolen, S. (author), Frens, A. (author), Gilding, C. (author), Karreman, W. (author)The Durban Harbour, run by the National Ports Authority of South Africa (NPA), is the largest harbour in South Africa. To stay competing in the 21st century the harbour entrance must be widened and deepened for the entry of Post Panamax ships. An important part of the Durban Harbour entrance Widening and Deepening project is the demolition of...master thesis 2005
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- Versmissen, K.P.A. (author) master thesis 2005
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Eijnthoven, E.D.P. (author)Koninklijke Boskalis Westminster nv heeft een model ontwikkeld waarmee de te behalen producties bij het baggeren van slib berekend worden. Belangrijke grondspecifieke invoerparameters voor dit model zijn de dichtheid en de ongeroerde schuifsterkte van de te baggeren grond. De informatie over de schuifsterkte van slib is soms niet of slechts zeer...master thesis 2004
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van der Aa, P. (author)Zandlichamen onder water, al dan niet kunstmatig aangelegd, vormen in de civiele techniek veelal het fundament van civieltechnische kunstwerken of maken onderdeel uit van landaanwinningen. Om aan deze functie te kunnen voldoen dienen de zandlichamen over voldoende draagkracht te beschikken, wat bij een hogere dichtheid van het zandpakket wordt...master thesis 2004
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Gangaram-Panday, A. (author)De Beers Marine is currently mining diamonds offshore near the Namibian coast (at water depths of 115 - 140 meters), using a vertical batch drill mining system ('Wirth drill"). Previously also continuous seabed crawlers have been used, but this method was discontinued because of unsatisfactory operational performance and recovery of the diamonds...master thesis 2003
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Burgmans, S.H. (author)De sleephopperzuiger is een vrijvarend schip dat natte grond verzet. De sleephopperzuiger kan zijn lading lossen door deze via de boeg door een nozzle (tromp) te lanceren. Deze losmethode heet rainbowen. Rainbowen van medium en grof zand is gebruikelijk, wat wil zeggen een korreldiameter van 200 µm tot 2000 µm. Bij rainbowen bestaat er grote...master thesis 2003
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Markvoort, J.W. (author)Het lossen van een zandlading van een sleephopperzuiger kan op 2 manieren geschieden, door onder- of hydraulisch lossen. Bij het hydraulisch lossen dient het zandpakket eerst te worden gefluseerd, dit gebeurt doormiddel van waterjets. Voor het optimaliseren van de beunvorm en het jetsysteem van een sleephopperzuiger is het van groot belang om...master thesis 2002
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Scholten, J. (author)Wanneer aan een zandige kust, waar sprake is van langstransport, een haven wordt aangelegd is het gevolg dat aan de bovenstroomse zijde van de ingang een aanzandingsgebied ontstaat en dat aan de benedenstroomse zijde erosie optreedt. Uiteindelijk groeit het aanzandingsgebied aan de bovenstroomse zijde uit tot het einde van de golfbreker en neemt...master thesis 2002
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