Dredging

Dredging cet500

Dredging simply refers to excavation operation, which is conducted underwater in shallow seas as well as in lakes and rivers, aiming for accumulation of bottom sediments in order to dispose them at a different place. Dredging is often required for maintaining waterways navigable but also for deepening harbour entrances, land reclamation, beach nourishment, removing trash etc. 

European Dredging Association defines dredging as: 'the maritime transportation of natural materials from one part of the water environment to another by specialised dredging vessels. It involves collecting and bringing up, fishing up or clearing away or out material and / or any object from the bed of a river, sea, etc.; transporting it to the relocation site and unloading the material or object.

Maintenance Dredging  Environmental dredging Dredging simply refers to excavation operationThe purpose for dredging can be maintenance of the depth or the deepening of navigation accesses or channels, it can also be land reclamation,coastal protection, seabed stabilisation for the offshore energy installations or the removal of contaminated sediments. In fact, in a usual dredging cycle, self-propelled trailing suction hopper dredgers, barges and other ships spend the majority of their time sailing back and forth between extraction sites and placement sites, transporting materials between the port and the borrow site; sailing between borrow sites; and sailing from sites where material has been extracted to unloading or placement sites.' 

Maintenance Dredging  Environmental dredging Dredging simply refers to excavation operation

There are principally 4 types of dredging activities, namely maintenance dredging, capital dredging, mineral dredging and environmental dredging. 

Maintenance Dredging is required to deepen or keep navigable of waterways, channels or harbour basins, which are constantly being silted, due to sedimented sand or mud. Cutter Suction Dredgers, Trailing Suction Hopper Dredgers are commonly used in such dredging operations.

Capital Dredging is conducted in order to create a new harbour, berth or waterway, or to deepen existing ones, in order to allow larger ships' access. Cutter Suction Dredgers, Trailing Suction Hopper Dredgers are commonly used in such dredging operations.

Mineral dredging carried out in order to extract minerals with an economic value from underwater deposits. Special types of Cutter Suction Dredgers, Trailing Suction Hopper Dredgers are commonly used in such dredging operations.

Environmental dredging is the activity of removing polluted sediments from lakes, rivers, bays or harbour basins. The Cutter Suction Dredger called Meltem Izmir, for example, is used for cleaning the Gulf of Izmir. Meltem Izmir, which is a CSD 500, was built by Gozuyilmaz Ltd. in 2012, with the cooperation of Italdraghe Spa. Cutter Suction Dredgers, Trailing Suction Hopper Dredgers are commonly used in such dredging operations.