Download e-book for kindle: Marine Ice Atlas For Cook Inlet, Alaska by Nathan D. Mulherin

By Nathan D. Mulherin

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8 knots) between the East and West Forelands, the narrowest point of the Inlet. 1-m/s (8knot) tidal currents near constrictions, such as between the Forelands, between Harriet Point and the south *So named, not because of the time of year in which they occur, but because the tides seem to leap or “spring” higher during those times of the month when the sun and moon are aligned. Conversely, when the moon is perpendicular to the alignment of the earth and sun, “neap tides,” that is, the smallest tides of the month, occur.

The surface waters draining into Knik Arm deposit a total of 20 million tons of sediment per year, while the annual sediment discharge into Turnagain Arm is only about 3 million tons (Gatto 1976). Because of the volume of sediment delivered, the southern third of Knik Arm, which serves as the shipping approach to the Port of Anchorage, is only about 18–36 m (10–20 fathoms) deep mid-channel. 2 Currents and tides Throughout the year the strong Alaska Current trends northwesterly along the Canadian and Alaskan coastlines, bringing southern waters to the Cook Inlet region.

35 36 37 38 39 40 41 42 43 Map Set 3. Probability of occurrence for ice of any stage of development and ice of at least 5/10ths concentration for Cook Inlet (December through March). 44 45 46 47 48 49 50 51 52 5 OCEANOGRAPHY tide. S. Army Corps of Engineers excavates about 172,000 m3 of silt from the Port’s maneuvering area each year to maintain –35 ft MLLW level (USACE 1993). Between the Forelands the water reaches a depth of 124 m (68 fathoms). The channels to the east and west of Kalgin Island attain depths of 73 and 121 m (40 and 66 fathoms), respectively.

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Marine Ice Atlas For Cook Inlet, Alaska by Nathan D. Mulherin


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