Dredging is miscellaneous excavation-type work or operation usually carried out underwater, in shallow sea or fresh water area(dredging shipping).Eritrea, Estonia, Ethiopia, Falkland Islands, Faroe Islands, Fiji, Finland, France, French Guiana, French Polynesia, French Southern Territories, Gabon, Gambia, Georgia, Germany, Ghana, Gibraltar, Greece,

A dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) is a device for scraping or sucking the seabed, used for dredging(dredging shipping).

A dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r is a ship or boat equipped with a dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)(dredging shipping).

In American usage any floating vessel equipped with dredging equipment is called a dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)(dredging shipping).Bulgaria, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Cape Verde, Cayman Islands, Central African Republic, Chad, Chile, China, Christmas Island, Cocos Islands, Colombia, Comoros, Congo, Congo, Democratic Republic, Cook Islands, Costa Rica, Croatia, Cuba, Cyprus, Czech Republic, Denmark, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea,

Beach Nourishment: mining sand offshore and placing on a beach to replace sand eroded by storms or wave action(dredging shipping). This is done to enhance the recreational and protective function of the beaches(dredging shipping). This is typically performed by a cutter-suction dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) or trailing suction hopper dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)(dredging shipping).
Removing trash and debris from the bottoms of rivers and canals and harbors(dredging shipping).
Getting useful material from the seabed(dredging shipping). One possible type in the future, is recovering natural metal ore nodules from the abyssal plains(dredging shipping).
Contaminant remediation(dredging shipping). Dredging is often used to reclimate areas affected by chemical spills, storm water surges (with urban runoff), and other soil contaminations(dredging shipping). Disposal becomes an aproportionatly large factor in these operations(dredging shipping).
Anti-eutrophication(dredging shipping). Dredging is an (expensive) option for the remediation of eutrophied (or de-oxygenated) water bodies(dredging shipping). As artificialy elevated phosphorus levels in the sediment aggrivate the eutrophication process, controlled sediment removal is occasionally the only option for the reclimation of still waters(dredging shipping). Afghanistan, Albania, Algeria, American Samoa, Andorra, Angola, Anguilla, Antarctica, Antigua , Argentina, Armenia, Aruba Australia, Austria, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Bosnia, Herzegovina, Botswana, Bouvet Island, Brazil, British Indian Ocean territory, Brunei Darussalam,

Suction dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)rs
These operate by sucking through a long tube, like some vacuum cleaners(dredging shipping). A plain suction dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r has no tool at the end of the suction pipe to disturb the material(dredging shipping).

Auger suction dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r
This works like a cutter suction dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r, but the cutting tool is a rotating Archimedean screw set at right angles to the suction pipe(dredging shipping).

Jet-lift dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) This uses the Venturi effect of a concentrated high-speed stream of water to pull the nearby water, together with bed material, into a pipe(dredging shipping).

Air-lift dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) An Airlift (dredging device) is a type of small suction dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)(dredging shipping). It is sometimes used like other dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)s(dredging shipping). At other times, often an airlift is used handheld underwater by a diver(dredging shipping). It works by blowing air into the pipe, and dragging water with it(dredging shipping).Svalbard and Jan Mayen Islands, Swaziland, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tokelau, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Tuvalu, Uganda, Ukraine, United Arab Emirates, United Kingdom, United States of America, Uruguay, Uzbekistan, Vanuatu, Vatican City, Venezuela, Vietnam, Virgin Islands, Virgin Islands, Yemen, Zaire, Zambia, Zimbabwe,

Grab dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)
A grab dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r picks up seabed material with a clamshell grab, which hangs from an onboard crane, or is carried by a hydraulic arm, or is mounted like on a dragline(dredging shipping). This technique is often used in excavation of bay mud(dredging shipping).Rιunion, Romania, Russian Federation, Rwanda, Saint Helena, Saint Kitts and Nevis, Saint Lucia, Saint Pierre and Miquelon, Saint Vincent and the Grenadines, Samoa, San Marino, Sao Tome, Saudi Arabia, Senegal, Serbia, Montenegro, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, South Georgia, Sandwich Islands, Spain, Sri Lanka, Sudan, Suriname,

Backhoe/dipper dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) A backhoe/dipper dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) has a backhoe like on some excavators(dredging shipping). A crude but usable backhoe dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r can be made by mounting a land-type backhoe excavator on a pontoon(dredging shipping).

Water injection dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) A water injection dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r injects water in a small jet under low pressure (low pressure because the sediment should not explode into the surrounding waters, rather it is carefully moved to another location) into the seabed to bring the sediment in suspension, which then becomes a turbidity current, which flows away downslope, is moved by a second burst of water from the WID or is carried away in natural currents(dredging shipping). Opposition claims that Water Injection Dredging is not a natural way of dredging while the side of the WID claims otherwise(dredging shipping). As a side note: Water injection results in a lot of sediment in the water witch makes measurement with most hydrografic equipment (for instance: singlebeam echosounder) difficult and should make use of filtering to produce better results(dredging shipping).Moldova, Monaco, Mongolia, Montserrat, Morocco, Mozambique, Myanmar, Namibia, Nauru, Nepal, Netherlands, Netherlands, New Caledonia, New Zealand, Nicaragua, Niger, Nigeria, Niue, Norfolk Island, Northern Mariana Islands, Norway, Oman, Pakistan, Palau, Palestinian Territories, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Pitcairn, Poland, Portugal, Puerto Rico, Qatar,

Amphibious dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime) Some of these are any of the above types of dredging (shipping industry, marine maritime construction navigation shipping shipper construction fund banking, maritime)r, which can operate normally, or by extending legs so it stands on the seabed with its hull out of the water(dredging shipping). Some forms can go on land(dredging shipping).