Maintenance dredging is required in many estuaries worldwide to provide access to ports and inland waterways. A newly developed dredging module is able to capture the two fundamental processes necessary to model the long-term impacts of dredging on turbidity.
Dredging for a new port complex in a remarkable, protected marine environment required adherence to very specific thresholds and an intensive Environmental Management Plan (EMP) that included mobile monitoring as well as daily visual observations of turbidity levels around the dredging works and the disposal zone.
An innovative environmental clamshell bucket and mobile dredge cell can generate less turbidity than a traditional silt curtain.
The environmental impact of turbidity depends upon the dredging technique used; the ease with which the sea bed material becomes resuspended; and the condition of the surface water. An on-site analysis is advisable.