乔治王岛菲尔德斯半岛周围海岸地貌研究

本文对南设得兰群岛乔治王岛菲尔德斯半岛周围现代和上升海岸地貌进行了研究。认为现代海岸地貌有三类:碎屑海岸、基岩海岸和冰崖海岸。对碎屑海岸受负载浮冰的波浪作用造成的各种现象进行了成因和类型研究。系统研究上升海岸之后得出结论,该区上升海岸地貌以海拔20米为界,上下分别属较老组和较新组。海岸平均上升速度为10毫米/年。

THE COASTAL PHENOMENA AROUND FILDES PENINSULA OF KING GEORGE ISLAND, SOUTH SHETLAND ISLANDS, ANTARCTICA

Field investigation of the modern coastal phenomena around the Fildes Peninsula of King George Island, South Shetland Islands, Antarctica permits us to suggest that there are three kinds of modern coastal features: fragmental coast, rock coast and ice cliff coast. The fragmental coast shows some peculiar high latitude landfbrms formed by wave action with floating ice. They are linear gravel ridges near back shore terrace, vertical gravel channels and ridges, pavements, graval pits and network structure in tideland.The typical features appear in tideland with gravel of 15-20 cm diameter and slopebelow 5°. Ice cliff coast is an important geomorphic element in polar area and hasspecific characteristics and process. Wave action is an important process for the ablat -ion of ice cliff coast and can accelerate the collapes of ice cliff. The raised coastal features belong to two groups, the younger and the older groups. The younger group is located below 20 meters above sea level and was formed in the Holocene (post-glatiation). The elevation of older group is approximately 20 meters above sea level and was formed during the last interglaciation or even earlier. The raising rate of Fildes Peninsula is 10.0 mm/a, which is larger than that of the margin of Antarctic Continent.