. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Figure 15-4. Potentially hazardous areas of northern Bering Sea (from Thor and Nelson 1979). dominant. Current speeds in this regime are no greater than 30 cm/sec. Calm weather conditions prevail for about 90 percent of the year in the northern Bering Sea, and less than 50 percent of the sediment transport takes place under these conditions (Cacchione and Drake 1979a). Norton Sound is commonly exposed to strong southerly and southwesterly winds generated by low-pressure weather systems i
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Figure 15-4. Potentially hazardous areas of northern Bering Sea (from Thor and Nelson 1979). dominant. Current speeds in this regime are no greater than 30 cm/sec. Calm weather conditions prevail for about 90 percent of the year in the northern Bering Sea, and less than 50 percent of the sediment transport takes place under these conditions (Cacchione and Drake 1979a). Norton Sound is commonly exposed to strong southerly and southwesterly winds generated by low-pressure weather systems in September, October, and November. A two-day storm in Sep- tember 1977 transported sediment equal to the trans- port that would occur during four months of quies- cent conditions. Current speeds were as much as 70 cm/sec during this storm. Graded storm-sand layers to 20 cm thick (Nelson 1977) occur in sea-floor strata of the northern Bering Sea, widespread evidence of major storm-surge events. The effects of storm surge are intensified by two factors: extremely shallow water depth (less than 20 m), and strong bottom return currents that may move large amounts of sediment northward to the Chukchi Sea. The thickness of Holocene sediment in Norton Sound relative to Holocene sediment input from the Yukon River indicates that significant amounts of
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