柯林斯冰帽雷达测厚和冰下地形研究

RADAR SOUNDING AND STUDY OF THE BEDROCK TOPOGRAPHY ON COLLINS ICE CAP

使用一台３００ＭＨｚ高频脉冲雷达，对柯林斯冰帽１５０个测点进行冰厚探测，描绘出１５ｋｍ冰床雷达回波剖面。该冰帽小冰穹最大冰厚１２５－１３１ｍ，位于其顶部，小冰穹顶至主冰穹顶脊线上的平均厚度约１０９ｍ；主冰穹顶部附近５０－８５ｍ深度处有一被钻探证实为含水界面的雷达回波；小冰穹近乎南北向的冰下地形与该岛北方台地地形相似。

Using a high frequency pulse radar of 300MHz, radar sounding was carried out at 150 points on Collins Ice Cap and the echo profile of bedrock in 15km distance was given. The maximum ice thickness, 125-131m, at Small Dome of this ice cap was located on the summit; the average thickness on the ridge from summit of Small Dome to summit of Main Dome was about 109m; a radar echo was observed at the depth of 50-85m around the summit of Main Dome, which was proven a water table by ice coring; the bedrock topography of Small Dome in the direction near south to north was similar to that of Northern Terrace.