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Dredging Phases

Dredging Phases. 4 phases excavation lifting transportation disposal. Guide 4: Machines, Methods and Mitigation; Chapter 2: Phases of a Dredging Project; Page 15. Dredging Phases. Excavation of the in-situ material by cutter head draghead cutting edge of a bucket

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Dredging Phases

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  1. Dredging Phases • 4 phases • excavation • lifting • transportation • disposal Guide 4: Machines, Methods and Mitigation; Chapter 2: Phases of a Dredging Project; Page 15

  2. Dredging Phases • Excavation of the in-situ material by • cutter head • draghead • cutting edge of a bucket • Main environmental aspects • Increase of suspended sediments • Mixing of soil layers • Dilution (in case of hydraulic dredging) Guide 4: Machines, Methods and Mitigation; Chapter 2: Phases of a Dredging Project; Page 15

  3. Dredging Phases • Raising the material • mechanically  backhoe, dipper, bucket ladder dredger • hydraulically  cutter suction, trailing suction hopper, disc bottom, auger and sweep dredgers • Main environmental aspects • Release of suspended sediments • Loose and mobile spill layers • Density of material • Overflow during loading of hopper or barges Guide 4: Machines, Methods and Mitigation; Chapter 2: Phases of a Dredging Project; Page 16

  4. Dredging Phases • Horizontal transport by • hydraulic pipeline • hopper dredgers • barges • also: trucks or conveyor belts • Main environmental aspects • safety • dilution • spillage • noise and air pollution Guide 4: Machines, Methods and Mitigation; Chapter 2: Phases of a Dredging Project; Page 16

  5. Dredging Phases • Placement or further treatment • reclamation of a site • beach nourishment • wetland creation • relocation on land, in a pit or at sea (underwater) • Main environmental aspects • Occupation of space and surface • Dispersion of the deposited material • Noise and air pollution • Groundwater quality Guide 4: Machines, Methods and Mitigation; Chapter 2: Phases of a Dredging Project; Page 17

  6. Environmental Dredging • Often with normal equipment • Sometimes with adapted procedures • When required, with special tools • Always resulting in lower output, higher cost Guide 4: Machines, Methods and Mitigation Chapter 3: Dredging Equipment Page 19

  7. Suction Dredger (SD) Guide 4: Machines, Methods and Mitigation Chapter 3: Dredging Equipment Page 19

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