DTIC ADA195719: The Environmental Evaluation Work Group pdf

DTIC ADA195719: The Environmental Evaluation Work Group

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Shipping through ice creates pressure waves. Pressure waves can displace benthos. The object of this study was to determine if through ‘hinge’ cracks in the ice the quantitative and qualitative loss was significant to the total estimated benthic population at three St. Marys River sites sampled between January 26 and March 27, 1979. Benthic displacement was associated with vessel length, speed, channel distance, bottom contours of the river, ice thickness and benthic density. The study found that approximately 0.1% of the benthic population below the ice was displaced and concluded that at Coast Guard regulated vessel speed limits, little damage would occur to existing benthic populations as a result of displacement through surface ice ‘hinge’ cracks. Keywords: Diptera; Environmental impact. (kt

• Creator/s: Defense Technical Information Center
• Date: 7/31/1979
• Year: 1979
• Book Topics/Themes: DTIC Archive, Gleason, Gale R, LAKE SUPERIOR STATE COLL SAULT STE MARIE MI DEPT OF BIOLOGY AND CHEMISTRY, *ENVIRONMENTAL IMPACT, *AQUATIC ORGANISMS, *SHIPPING, BENTHONIC ZONES, BOTTOM, CHANNELS, COAST GUARD, CONTOURS, CRACKS, DAMAGE, DEMONSTRATIONS, DENSITY, DIPTERA, DISPLACEMENT, ENVIRONMENTS, ESTIMATES, ICE, LENGTH, NAVIGATION, POPULATION, PRESSURE, RANGE(DISTANCE), RIVERS, SITES, SURFACES, TEST AND EVALUATION, THICKNESS, WAVES, WINTER, ICE BREAKUP, STRESS WAVES

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