930 resultados para Naval Underwater Systems Center (U.S.)


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National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

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Federal Transit Administration, Washington, D.C.

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"Report date: February 1988"--Technical report documentation page.

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Performed by Naval Weapons Support Center, Applied Sciences Department.

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Chiefly tables and diagrams.

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4 leaves in pocket.

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"January 1977."

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The objective of this study was to determine the effects, if any, of sublethal concentrations of suspended materials on the fish in estuarine systems. Experimental sediment suspensions reproduced the concentrations frequently found during flooding and at dredging sites and dredged-material disposal sites. The suspensions were of natural sediment, obtained from the Patuxent River estuary, Maryland, or commercially available Fuller's earth. Fish were collected in the Patuxent River estuary and transported to the laboratory. The selected fish species inhabited ecologically different sections of the estuary; therefore, the overall reactions of each species were unique. Seven species of estuarine fish were exposed to Fuller's earth and natural sediment suspensions for timed periods and hematological changes were noted. The effects of various concentrations of Fuller's earth suspensions on white perch gill tissue were determined. Oxygen consumption rates of striped bass, white perch, and toadfish were measured in filtered Patuxent River water and compared to consumption rates in filtered river water suspensions of Fuller's earth or Patuxent River sediment. Fish showed signs of stress in response to suspended sediments in most of the experiments. Results indicate that sublethal concentrations of suspended solids can affect estuarine fish.

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Issued October 1977.

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"February 1980."

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"Scale factor system, oblique photo, developmental. Contract NOas 59-6067-c, Aeronautics specification XPH 118 (modified)."

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At head of cover title: 23-70. Generalized computer program.

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"A contract between Amphibious Branch, Office of Naval Research, U. S. Naval Photographic Interpretation Center, Monitor [and] School of Civil Engineering, Cornell University. Beach accessibility and trafficability, project no. NR 257 001, contract N6onr, task order # 11. Petrographic analysis by Francisco J. Cordova. D. J. Belcher, director."

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Includes bibliographical references.

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"EPA 814/B-96-004."