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'Alexander von Humboldt' Keeping Busy on Two Continents
01 Jun 2006
Belgian contractor Jan De Nul NV is undertaking coastal protection works in the north of the Netherlands which involve both beach reclamation and foreshore suppletion.
One project concerns a foreshore suppletion off Callantsoog, where a 5km long sandbank is being constructed on the foreshore of the North Sea coast with some 1,897,500m 3ofdredged sand. The sandbank is being constructed by the trailing suction hopper dredger Galilei 2000 in works which began in March and will continue to November. The second project concerns a beach regeneration on the island of Texel over a distance of 2.5km. For this purpose, a submerged pipeline of 1,100m length has been placed. The works, scheduled for completion this month, involve the trailing suction hopper dredger Alexander von Humboldt reclaiming some 1,162,650m 3of sand.
Sand reclamation for both projects is taking place from borrow areas in the North Sea.
Jan de Nul, in joint venture with Somatra, has signed a contract for the de-pollution and rehabilitation of an old phosphoric gypsum dumping ground on the north cost of Tunisia at Sfax. Some 2.8 million m 3on land and approximately 1.3 million m3 below sea level of polluted sands need to be excavated.
The polluted sediments will be stockpiled in a designated area, laterally confined by a PHDE screen and a bentonite wall, while the cleaned area on land has to be restored by the reclamation of 6.15m m 3of sand.
This will be dredged by the ubiquitous Alexander von Humboldt in the nearby Channel of Kerkennah. The spoil deposit will be covered by land based material in a project expected to take 2.5 years to complete.
MJInformation No: 21947
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