Dredging activities often result in the suspension of sediment into the water column in the vicinity of the activity. Sediment release to the aquatic environment and the effects of this release are often the prime environmental concern associated with dredging.
To manage costs and the long-term effects of dredging in highly dynamic estuarine areas, continued scientific research, modelling and analysis are indispensable.
Remediation projects are becoming more frequent: Here’s a snapshot of the current state of the industry, including which countries at present have a regulatory framework and/or technical framework in place (and which do not), and what technologies are actively being used.
By studying the different mechanisms of sediment movement, solutions were developed to reduce sedimentation in harbours, and thus reduce the need for maintenance dredging.
To assess the environmental benefits of an “idyllic” world without dredging, the impacts of dredging activities are compared to the impacts of other human and natural sources of sediment plumes.
The Miami River corridor was home to early Native American settlements, and in the early 1900s it was dredged in order to assist in draining the Everglades, the subtropical marshland in southern Florida. As the city of Miami developed, the river became a major outlet for storm water and untreated sewage. In 1990 the USACE recommended that maintenance dredging be done to remove sediments impacting navigation.
This study analysing changes in the bottom-topography at dredged material disposal sites and the interaction between disposed matter and the surrounding density currents received the IADC Award at the CEDA Dredging Days.