In order to provide the necessary depth to water near the ports, it becomes essential to do the process of dredging which is a specialized form of excavation. The various types of dredgers are employed for this purpose.
Dredging is the removal of sediments and debris from the bottom of lakes, rivers, harbours, and other water bodies. It is a routine necessity in waterways around the world because sedimentation—the natural process of sand and silt washing downstream—gradually fills channels and harbours.
Dredging often is focused on maintaining or increasing the depth of 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 bottom.
Following are dredgers which are commonly used in the construction of marine works
- Bucket – ladder dredgers
- Dipper dredgers
- Grab dredgers
- Hydraulic dredgers