DOP Submersible dredge pumps

Island for migrating birds created using DOP250

Location: Haringvliet, The Netherlands
Period: Q3/2019
Product type: DOP250 with leveller head
Contractor: Dredge Pump Solutions for
Martens en Van Oord
Island for migrating birds created using DOP250

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The Haringvliet – a large water body just south of Rotterdam – was closed off the North Sea in 1970 to protect the Low Lands. Fierce storms from the North West had created huge damage a decade earlier, and closing off the estuary seemed the only choice. Over the years the water turned from brackish to fresh, changing the wildlife habitat drastically.

Overview from the project set up with the pontoon based excavator with floating pipe line and the san barge alongside

Recently, the locks - which have remained closed for decades - have been opened partially. As a result the tidal movement has returned, and the water will turn brackish again. The main reason for opening the sluices is the improvement of the water quality and the altered pattern of silt deposition.

Once there is plenty of water the DOP250 starts emptying the barge, and works as a high mixture concentration sand dredging pump

The now brackish Haringvliet required adaptations for the wild life. The area is reknown for the large flocks of migratory birds stopping over on their journey from Northern Europe to Africa. For these birds a new stopping-off point has been created : an artificial island as a bird sanctuary.

The DOP250 at the start of the barge unloading process – the excavator mounted dredge pump is manoeuvred by the excavator on the pontoon

For newly created island 5.000 m3 of coarse sand had to be transported. This new island is located in a very shallow area the sand barges could not reach due to their draught. The creative solution was using a DOP250 submersible dredge pump to bridge the gap.

The dredging process needs plenty of transport water which is added to the dry sand cargo

The DOP250 was connected to a pontoon-based Caterpillar 374D LRE excavator. A carousel of sand barges was moored alongside. Sufficient transport water was added to the cargo, creating a mixture which could be pumped out easily.

The dredging process requires plenty of transport water

The DOP250 was lowered into the sand cargo, emptying the barge and pumping the coarse sand over some 300 m to the new isle through a Di 250 mm pipe line.

The new island will create a safe habitat in the dynamic tideland.