Figure 8. Examples of types of dredges: (A) bucket or mechanical 

 dredge, and (B) suction or hydraulic dredge (Source Reference 33) 



A-FRAME- 



SPUD 



jJ/i=i/t=^TmMT^ 



DIPPER BUCKET- 



A-FRAME 



LADDER 



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or temporarily stockpiled on barges or trucks and moved to a disposal 

 area. Mechanical dredges are less expensive to operate, do not require 

 pipelines and are more versatile, being designed to cut into compacted 

 sediments better than suction dredges [34]. 



The cutterhead dredge is perhaps the most versatile of all but 

 ' expensive to operate [35]. It has a high potential for creating 

 verse environmental effects because of the turbidity clouds that 

 aVQ. typically generated in the vicinity of the cutterhead. 



88 



