Kristian Ferrell
Dredgers are vessels that remove sediment from the seabed to maintain or increase the depth of navigation channels, anchorages, or berthing areas. This ensures the safe passage of boats and ships, which require a certain amount of water to float and not touch the bottom. Dredgers can be self-driven or towed by a regular fishing boat, and they come in different types, including the trailing suction hopper dredger (TSHD) and the amphibious dredger.
| Characteristics | Values |
|---|---|
| Purpose | To remove sediment from the sea bed |
| Use | To maintain or increase the depth of navigation channels, anchorages, or berthing areas to ensure the safe passage of boats and ships |
| Speed | Between two and three knots per second |
| Types | Trailing suction hopper dredger (THSD), auger-suction dredger, jet-lift dredger, hopper dredger, amphibious dredger |
| Function | Breaks up material and feeds it to the suction system; can also deposit material directly or store it on the vessel |
| Use cases | Creating new harbours and shipping channels; reducing exposure of fish, wildlife, and people to contaminants |
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What You'll Learn
- Dredgers remove sediment from the sea bed
- Dredgers can be used to create new harbours and shipping channels
- Dredgers can be used to reduce the exposure of fish, wildlife, and people to contaminants
- Dredgers can be self-driven or towed by a regular fishing boat
- Dredgers can be used in all types of sediments and are very nimble
Dredgers remove sediment from the sea bed
There are several types of dredgers. The trailing suction hopper dredger (TSHD) is self-driven and can be used at sea or on inland waterways. It is sometimes confused for a large boat or barge. The dredger comes equipped with a suction pipe, a hopper (or trailer) for holding material, and a means of emptying the hopper. When the hopper reaches capacity, the dredger stops dredging, lifts the pipe, and moves to the location where the material will be deposited. Gates (or valves) open to empty the material and then the machine returns to dredging.
Auger-suction dredges are similar, except that they burrow a hole into the surface. They work well for heavy-duty removal applications and deep removal. Jet-lift uses a high-volume stream of water to pull in material. Hopper dredges are vessels that can work in all types of sediments, are very nimble, and can transport the material to another location. They work well in rough seas, deep water, and in high-traffic areas.
Amphibious dredgers often have long legs which are hinged, allowing them to work both as a regular vessel and one that stands on the bed to keep its hull above the water line. They remove material from the bed using a shovel, buckets or a grab.
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Dredgers can be used to create new harbours and shipping channels
Dredgers are used to remove sediment from the seabed, which can be used to create new harbours and shipping channels. They can also be used to maintain or increase the depth of existing navigation channels, anchorages, or berthing areas to ensure the safe passage of boats and ships. Vessels require a certain amount of water in order to float and not touch the bottom. This water depth continues to increase over time as larger and larger ships are deployed.
There are several types of dredgers, including the trailing suction hopper dredger (TSHD), which is self-driven and can be used at sea or on inland waterways. The TSHD is equipped with a suction pipe, a hopper (or trailer) for holding material, and a means of emptying the hopper. Dredging is achieved at a very low speed—between two and three knots per second. When the hopper reaches capacity, the dredger stops dredging, lifts the pipe, and moves to the location where the material will be deposited.
Another type of dredger is the auger-suction dredger, which burrows a hole into the surface and is well-suited for heavy-duty removal applications and deep removal. The jet-lift dredger uses a high-volume stream of water to pull in material, while the hopper dredger is a nimble vessel that can work in all types of sediments and transport material to another location. It is well-suited for rough seas, deep water, and high-traffic areas.
Amphibious dredgers have long, hinged legs that allow them to work as both a regular vessel and one that stands on the seabed, keeping its hull above the waterline. They remove material from the bed using a shovel, buckets, or a grab.
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Dredgers can be used to reduce the exposure of fish, wildlife, and people to contaminants
Dredgers are used to remove sediment from the seabed, which can be used to create new harbours and shipping channels. They can also be used to maintain or increase the depth of navigation channels, anchorages, or berthing areas to ensure the safe passage of boats and ships.
There are several types of dredgers, including the trailing suction hopper dredger (TSHD), which is self-driven and can be used at sea or on inland waterways. TSHDs are equipped with a suction pipe, a hopper for holding material, and a means of emptying the hopper. Another type of dredger is the auger-suction dredge, which burrows a hole into the surface and is well-suited for heavy-duty removal applications and deep removal. Jet-lift dredges use a high-volume stream of water to pull in material, while hopper dredges are nimble vessels that can work in all types of sediments and transport material to another location.
Dredgers can also be used to gather seafood for sale and consumption from the seabed. Main catches include oysters, mussels, clams, and scallops, although some fishing dredgers can also harvest sea cucumbers, conch, sea urchins, and crabs. By using dredgers to gather seafood, the exposure of fish, wildlife, and people to contaminants can be reduced as the seafood is sourced from a clean environment.
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Dredgers can be self-driven or towed by a regular fishing boat
Amphibious dredgers, on the other hand, are towed by a regular fishing boat. They have long, hinged legs that allow them to function as both a regular vessel and one that stands on the seabed, keeping its hull above the waterline. They remove material from the seabed using a shovel, buckets, or a grab. This type of dredger is used to gather seafood for sale and consumption, including oysters, mussels, clams, and scallops. Some fishing dredgers can also harvest sea cucumbers, conch, sea urchins, and crabs.
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Dredgers can be used in all types of sediments and are very nimble
Dredgers are used to remove sediment from the bed of a body of water. They are used to maintain or increase the depth of navigation channels, anchorages, or berthing areas to ensure the safe passage of boats and ships. This is particularly important as ships are getting larger and require more water to float and not touch the bottom.
The trailing suction hopper dredger (TSHD) is self-driven and can be used at sea or on inland waterways. It is equipped with a suction pipe, a hopper for holding material, and a means of emptying the hopper. Dredging is achieved at a very low speed—between two and three knots per second. When the hopper reaches capacity, the dredger stops dredging, lifts the pipe, and moves to the location where the material will be deposited.
The hopper dredge is a nimble vessel that can work in all types of sediments and transport the material to another location. They work well in rough seas, deep water, and in high-traffic areas. This type of dredger is particularly useful for heavy-duty removal applications and deep removal.
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Frequently asked questions
A dredger is a vessel that removes sediment from the sea bed.
There are several types of dredger, including the trailing suction hopper dredger (THSD), which uses a suction pipe to remove material from the sea bed. The material is then stored in a hopper (or trailer) until it reaches capacity, at which point the dredger moves to the location where the material will be deposited and empties the hopper.
Dredging is used to maintain or increase the depth of navigation channels, anchorages, or berthing areas to ensure the safe passage of boats and ships. It can also be used to create new harbours and shipping channels.
