Anmerkungen:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Beschreibung:
Source: https://erdc-library.erdc.dren.mil/jspui/ ; Tn October 1980 the U. S. Army Corps of Engineers conducted a beach nourishment project at the Lexington (Michigan) Harbor on the southwest shore of Lake Huron, a project designed to mitigate beach erosion attributable to the installation of the harbor. In response to a request from the Coastal Engineering Research Center (CERC), the U.S. Fish and Wildlife Service's Great Lakes Fishery Laboratory conducted a Corps-funded study from June 1980 to October 1981 along a 8.4-kilometer segment of shoreline adjacent to the harbor to determine the effect of the Corps beach nourishment project on the nearshore aquatic environment. The study performed by the service included aerial photographic surveys of the study area; measurements of dissolved oxygen, turbitity, and suspended particulate matter levels; and collection of lake bottom sediments. macrozoobethos, and fish. Analysis of the aerial photography showed that the beach profile changed markedly during the study period. Dredging of about 19,000 cubic meters of beach sediment from an accretion area adjacent to the harbor's north breakwater caused the beach face to recede, while depositions of this sediment on a feeder beach south of the harbor caused the beach face there to extend lakeward. Deposition on a second feeder beach south of the harbor of about 35,000 cubic meters of sediment from a land borrow site caused the beach face at the second feeder beach to extend lakeward. One year after the beah nourishment project was completed the beach face in the accretion area had returned to its predredged location, while the beach face south of the harbor still occupied a position similar to that observed at the completion of the beach nourishment project in October 1981. Analysis of the other data collected revealed no change in the particle-size distribution of the bottom sediments, the water quality, or the distribution and abundance of macrozoobenthos and fish in the study area that could be attributed to the Corps' ...