Dredgers.

Sand and Mud.

Modern shipping cannot operate effectively without the deployment of ships that can remove sand and mud bars from river mouths and estuaries. Ships are getting bigger and heavier, they also are some times much larger under the water and now are more likely to scrape their hulls.

The dredging companies are usually under licences to clear and sell sand for commercial uses, where as mud is redeposited to other deep area of water.

Sand and mud flats are created by the under water currents and built up deposits from rain and flooding in rivers. I have filmed quite a number of boats that visit the Port of Swansea and work around the Bristol Channel ports. Arga Bay, Sand Heron/Harrier, Welsh Piper and Arco Dart.