The chain bucket dredger is to use a series of bucket chains with buckets, driven by the upper guide wheel, to make it contact with the dredged soil layer. Then drive the bucket chain continuously under the drive of the upper guide wheel to drive the bucket mud on the bucket chain, dig the mud and load it, then lift it out of the water surface with the rotation of the bucket chain, and transfer it to the top of the tower, after the upper guide wheel changes direction The sand in the bucket is poured into the mud well in the bucket under its own gravity. Finally, the sediment was discharged out of the chain bucket dredger through the chute on both sides. Unload the mud barge docked next to the chain bucket dredger, and then use the service ship to drag the mud barge to the unloading area.

The bucket wheel dredger has the same characteristics as the cutter suction dredger. Except for the different mechanical methods of excavation, the wheel rotation axis is at a certain angle with the support arm, and the cutter suction dredger rotates the cutter head. The axis is parallel to the arm. The wheel cutter axis is perpendicular to the long axis of the support arm, that is to say, the bucket wheel excavation process is symmetrical with its yaw direction. The way of undercut or upcut mainly depends on the direction of rotation of the bucket wheel around its axis rather than the direction of its swing.