An Environmental Survey of Effects of Dredging and Spoil Disposal, New London, Connecticut.
Quarterly rept. no. 5, Jul-Sep 75.
NATIONAL MARINE FISHERIES SERVICE HIGHLANDS N J MIDDLE ATLANTIC COASTAL FISHERIES CENTER
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Surveys continue to indicate that short-term dredging impacts have been spatially and temporally limited. Assessment of long-term effects is still underway. Testing of a numerical streamflow model will aid in determining whether dredging has modified the rivers hydraulic regime. Another investigation was of currents and water movements in the disposal area, and of the effects of dumping on water and sediment characteristics there. In one experiment conducted on an ebbing tide, surface and bottom drogues were tracked from the disposal buoy through the Race and well into Block Island Sound on another ebb tide the drogues moved east toward Fishers Island Sound, and then turned north and west as the tide began to flood. Two surveys of disposal area water quality were made. Values for dissolved oxygen, pH, Eh, suspended and volatile solids were fairly uniform and unremarkable throughout the study area. Chemical oxygen demand and heavy metals of sediment generally had higher values near the center of the disposal area, but overall variations were thought to be random. No increases were seen when compared to January 1975 concentrations. It was concluded that no major changes attributable to dumping had yet been detected in sediments or water column.
- Hydrology, Limnology and Potamology
- Civil Engineering