Freezeup Processes on Arctic Beaches
ABSTRACT. Observations made along the northern Alaskan coast during 1972 served to indicate the processes by which arctic winter beach features are formed. In sub-zero (centigrade) temperatures ice forms on the surface of brackish lagoonal and estuarine waters, and is often moved offshore by wind-ge...
| Main Authors: | , , , , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.457.9729 http://arctic.synergiesprairies.ca/arctic/index.php/arctic/article/viewFile/2875/2852/ |
| Summary: | ABSTRACT. Observations made along the northern Alaskan coast during 1972 served to indicate the processes by which arctic winter beach features are formed. In sub-zero (centigrade) temperatures ice forms on the surface of brackish lagoonal and estuarine waters, and is often moved offshore by wind-generated and tidal currents. When waves, wind, and storm surges coincide with the presence of ice in the nearshore zone, the ice and frozen swash mass are deposited contiguously with sediment on the beach as distinctive ice and ice-sediment structures. These structures include ice-slush berms, ice-sediment interbedding, and buried ice boulders. RÉSUMfi. Processus d'engel sur des plages arctiques. Des observations men & le long de la côte nord de l'Alaska en 1972 ont servi à indiquer les processus selon lesquels les traits hivernaux des plages arctiques se forment. Par des températures sous zéro (Celsius), la glace se forme à la surface des eaux saumâtres des lagunes et des estuaires et est souvent emportée vers le large par les courants d'origine éolienne et tidale. Si les vagues, le vent et la houle de tempête coïncident avec la présence de glace dans la zone côtière, cette glace et la masse d'écume gelée se déposent avec les sédiments sur la plage, sous forme de structures bien distinctives de glace et de sédiments mêl6s de glace. Parmi ces structures, on compte des banquettes de boueige, des lits alternés de glace et de sédiments et des blocs glaciels enfouis. PE3IOME. Ilpoyeccat o6pa3oeawu ~ nt & nu no6epext.e Apxmuxu. H~JIIOA~AEISI |
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