To determine the behavior of sediments at the disposal site, this study was designed to 

 answer the following questions: 



1) Will the material released at CSDS over a period of several weeks form a 

 discrete mound? 



2) Assuming a mound does form, at what rate does erosion dissipate the mound? 



3) What currents would transport material away from the site, and what are the 

 primary directions of transport? 



While this study cannot directly address question 3, field data from this study provide 

 evidence for predicting two-dimensional transport. If these data are to be incorporated into 

 particle trajectory modeling for a more refined determination of the fate of suspended 

 particles, more information on three-dimensional dynamics needs to be obtained. With 

 model-determined transport patterns, investigations can be designed that could verify the 

 currents required to transport material out of CSDS, and the directions of transport. 

 However, a more immediate goal is to determine the effects of dredging (i.e., by different 

 methods) and disposal conditions on the dynamics of dredged materials at CSDS. 



The planned disposal of fine-grained material from North Cove, Connecticut provided 

 an opportunity to observe the dynamics of mechanically dredged materials. The initiation of 

 hydraulic dredging of sand from channel bars in the Connecticut River before North Cove 

 allowed an unexpected comparison with the North Cove project. By studying two distinct 

 dredging projects, the ability to determine mound erosion rates was limited to "before and 

 after" bathymetric surveys. However, by including both projects we could evaluate the 

 dynamics of the two types of materials disposed at this site. 



Synthesis of Monitoring Surveys at the Cornfield Shoals Disposal Site, July 1991 to May 1992 



