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Dredging and Marine Contractors
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Water Injection Dredging The natural way of dredging
Dredging and Marine Contractors
Overview
Water Injection Dredging (WID) is a dredging technique
that removes sediment ‘the natural way’. It is an efficient
and environmentally friendly way of maintaining the depth
of navigation channels, ports and rivers. A water injection
dredger can work very close to embankments and quay
walls because of the manoeuvrability of the vessel.
Van Oord developed this efficient and cost-effective
hydrodynamic dredging technique, which removes sediment
with the help of natural processes. For over 30 years Van Oord
has been using this technique to execute maintenance dredging
work in ports, marinas, estuaries and access channels around
the world. Water injection dredging is a proven technology and
Van Oord continuously strives to find new innovative solutions
to keep its leading position in this specialised market.
The method
Water injection dredging is highly effective in recently
deposited fine sediments that consist of fine sand, silt and
clay particles. This unique dredging method injects water
into the subsoil and fluidizes the fine sediments creating a
density current. This density current moves under the influence
of natural forces away from the dredged area and takes the
sediment particles with it, either to deeper areas at sea or to
high energy environments where the sediment is brought back
into the water column, where it becomes part of the natural
system of erosion, transportation and deposition of sediments.
Sustainability
Environment
Embedded in Van Oord’s culture is the consideration for the
environment that we undertake in our operations. Water injection
dredging relies on nature to take care of the horizontal transport
of sediments, therefore eliminating the need for mechanical means
of moving dredged materials. This results in a considerably lower
CO2 footprint per dredged cubic meter of sediment.
Sustainable cost saving
The deployment of water injection dredging provides a
sustainable cost saving. Applied under the right circumstances,
this method can equal the production of trailing suction hopper
dredgers. Due to its size and manoeuvrability, water injection
dredgers are able to work within busy ports, marinas and water
ways without causing disturbance to marine traffic. Road transport
Our smaller dredgers can be disassembled and easily transported
by road. As a result, they can be employed in lakes, estuaries,
ports, rivers and even on quarry reservoirs where sand or gravel
mining activities need to be executed.
New generation
Van Oord has ordered the construction of two state-of-the-art
water injection vessels. The new water injection vessels will be
equipped with a hybrid energy management system. This new
generation of vessels is versatile and has water injection
dredging, mass flowing and power jetting systems. The latest
technological developments have also been applied, such as
heave compensation and dynamic positioning, which means
that the dredging can be performed more efficiently.
Advantages
- Environmentally friendly
- Our smaller units are containerized and road transportable,
easy to mobilise
- No pipelines, barges blocking or disrupting waterways
- Considerably lower CO2 footprint per m3
- Cost-effective as no auxiliary equipment is required
- Dredged sediments remain within the existing sediment system
- No disposal area needed
Equipment
Our water injection dredging vessels are shallow drafted, self-propelled and highly manoeuvrable to work in
confined areas and in strong currents. Some of our smaller water injection dredging units are containerized
and can be transported by road. Some of our vessels are designed as multi-purpose vessels to which
excavator attachments can be fitted, enabling cutter suction dredging or mechanical excavation.
Jan
uary
2020
Please contact our representative at your nearest local Van Oord office.
Visit our website for the contact details:www.vanoord.com
Contact
Van Oord
PO Box 8574
3009 AN Rotterdam
The Netherlands
T +31 88 8260000
F +31 88 8265010
Water injection dredging vessels
Name
Sagar Manthan
Antareja
Iguazú
Jetsed
Njörd
Draga Rio Madeira
Borr
Odin
Baldr
46.50 x 11.28 x 4.00
47.17 x 11.22 x 4.00
43.80 x 12.50 x 4.20
37.34 x 13.85 x 2.20
34.70 x 11.67 x 2.48
35.72 x 8.29 x 2.57
18.73 x 5.32 x 1.80
17.50 x 4.50 x 1.80/1.25
10.33 x 4.08 x 1.50
2,106
2,096
2,091
2,073
1,644
1,224
460
410
89
20
20
27
25
21
20
14
10
8
Dimensions
(m)
Total power installed
(kW)
Maximum dredging depth
(m)
New vessels under construction
Name
Maas
Mersey
43.07 x 12.40 x 3.40
43.07 x 12.40 x 3.40
2,044
2,044
24
24
Dimensions
(m)
Total power installed
(kW)
Maximum dredging depth
(m)
