182. U.S., NATIONAL MARINE FISHERIES SERVICE, "An Environmental Survey of 

 Effects of Dredging and Spoil Disposal, New London, Connecticut," 

 Report No. MAF-Informal-49, Government Reports Announcement, Vol. 75, 

 No. 23, Oct. 1975. 



The report considers activities and findings of several integrated 

 research projects designed to monitor the environmental effects of dredging 

 in the Thames River and dredge spoil disposal at the New London dumping ground. 

 The report addresses field activities conducted and results obtained. Univer- 

 sity of Connecticut completed three additional cruises in the Thames River to 

 investigate suspended material transport. Progress has been made toward select- 

 ing a circulation model for determining dredging-induced variations and toward 

 characterizing the average loads of suspended sediments during autumn. The 

 University of Connecticut report contains photos of spoils at the dump site 

 and evidence of past dumping. Scuba surveys conducted in late November and 

 early December found no major changes in the bottom conditions. The New York 

 Ocean Science Laboratory reports establish predisposal values for the physical 

 and chemical oceanography of the dump site and describe changes found in Sep- 

 tember and December, as well as effects of single dumping events at those times. 

 The report also presents predisposal concentrations of heavy metals in benthic 

 animals . 



183. UNIVERSITY OF MARYLAND, NATURAL RESOURCES INSTITUTE, "Hydraulic and 

 Ecological Effects of Enlargement of the Chesapeake and Delaware Canal, 

 Summary of Research Findings," Final Report No. CONTRIB-566, Solomons, 

 Md., Sept. 1973. 



An estimate of the ecological effects of the enlargement of the Chesa- 

 peake and Delaware Canal from control dimensions of 8 meters by 76 meters to 

 11 meters by 137 meters is given. Serious constraints exist as the study was 

 initiated late in the process of canal enlargement and the time available for 

 the study was short. Specific subgoals were identified as objectives for the 

 described research program. These dealt with the salinity and flow patterns 

 of the canal; its value as a nursery for fish; the movements of fish through- 

 out the canal; and the populations of other organisms within it. In each 

 case, the effects of the enlargement were sought and the most advantageous 

 operation of the canal from various ecological points of view were considered. 

 Basically, all our studies can be grouped under two major headings: one deal- 

 ing with the hydrographic effects and the other with the ecological effects of 

 canal enlargement. Findings and results are discussed in detail in each of the 

 14 appendixes that cover a specific study. . 



184. VAUGHAN, R., and KIMBER, C, "Maintenance Dredging Effects on Vegetation 

 Adjacent to the Gulf Intracoastal Waterway - Cedar Lakes Section," Sea 

 Grant Publication TAMU-SG-77-207, Texas A & M University, Geography Depart- 

 ment, College Station, Tex., June 1977. 



The relationship of spoil deposition and bank erosion to habitat conditions 

 and vegetation is examined in six sites along the gulf Intracoastal Waterway 

 in Brazoria County, Texas. Fourteen mappable plant assemblages were identified 

 and verified in the field. Species frequencies are presented and compared with 

 environmental data collected along the same transects. Vegetation maps depict 

 the pattern of assemblages for each site. 



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