Tidally generated sea-floor lineations in Bristol Bay, Alaska, USA |
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| Authors: | M S Marlow A J Stevenson H Chezar R A McConnaughey |
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| Institution: | (1) Coastal and Ocean Resources Inc., Sidney, BC, Canada, V8L 5Y8;(2) Alaska Science Center, U.S.Geological Survey, 1011 East Tudor Road, Anchorage, AK 99503, USA;(3) Alaska Fisheries Science Center, National Marine Fisheries Service, Seattle, WA 98115-6349, USA;(4) Quester Tangent Corporation, Sidney, BC, Canada, V8L 5Y8 |
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| Abstract: | Highly reflective linear features occur in water depths of 20–30 m in northern Bristol Bay (Alaska, USA) and are, in places, over 600 m in length. Their length-to-width ratio is over 100:1. The lineations are usually characterized by large transverse ripples with wavelengths of 1–2 m. The lineations trend about N60°E, and are spaced between 20 and 350 m. Main tidal directions near the lineations are N60°E (flood) and S45°W (ebb), which are parallel to subparallel to the lineations. They suggest that the lineations may be tidally generated. The lineations may be bright sonar reflections from a winnowed lag concentrate of coarse sand. |
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