![]() ![]() And as climate change leads to a rise in sea levels and the melting of the ice caps, this global challenge is only made more acute.ĭEME has the knowledge and experience needed to assist with this global issue. ![]() 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 world’s population is expected to increase by 2 billion persons in the next 30 years, from 7.7 billion currently to a staggering 9.7 billion in 2050, according to the United Nations and coupled with that, half of the global population lives within 200 km of the sea.Īs coastal areas become increasingly densely populated, coastal erosion protection and flood defence measures become even more crucial. 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. 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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