The sand can also be deposited through doors located in the bottom of the vessel.īoskalis has around 21 trailing suction hopper dredgers, including two of the world’s largest, the Queen of the Netherlands and the Fairway. The sand is pumped through floating pipelines into the reclamation area. This approach is used for example in land reclamation or coastal protection projects. The sand is sprayed through a nozzle in the bow rainbowing in an arch through the air.Īnother discharge method consists of pumping the sand ashore by floating or sunken pipelines. Rainbowing is used when the vessel can get close to the discharge location and the previously reclaimed sand body is above or almost above the surface. The vessel can discharge its load in various ways, depending on the project specifications. Basic ship forme - outlines, general arrangement of general cargo ships, hopper suction dredger, cutter suction dredger. Dredging stops when the maximum hopper capacity is reached. Excess water flows out through so-called overflows. The mixture of sand and water is pumped into the hopper of the dredging vessel. The drag head moves slowly over the bed collecting the sand like a giant vacuum cleaner. Trailing suction hopper dredgers are equipped with one or two suction pipes ending in drag heads. Boskalis deploys trailing suction hoppers dredgers for the construction and maintenance of ports and waterways as well as land reclamation and coastal defense and riverbank protection.
The trailing suction hopper dredgers (TSHDs) of Boskalis are oceangoing vessels that can collect sand and silt from the seabed and transport it over large distances.
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