Completion of Velocity Survey of Ice Stream B and Catchmentsof Ice Streams B and C

本项目支持完成南极冰流B的摄影测量。这项工作的成果包括：1)精确的流量计算，以完善质量平衡的确定；2)描述水流扰动，以显示冰流侧面和控制水流的基本特征的影响；3)计算力预算，得到可在基础力学中解释的基础阻力和滑动速度图。集水区的测量工作亦已完成。该区域的界限将被更好地定义，积累速率将被绘制出来，并沿着选定的流带获得精确的散度测量。这些数据对于准确计算南极西部冰盖的物质平衡是必要的。实地工作将于1988- 1989年进行，数据裁减将于1989- 1990年进行。

This project supports the completion of photogrammetry of ice stream B, Antarctica. Products of this work include: 1) accurate discharge calculations to refine mass balance determinations, 2) description of flow disturbances to show the influence of ice stream sides and of basal features in controlling flow, and 3) calculations of force budget for the production of maps of basal drag and sliding velocity that can be interpreted in of basal mechanics. The survey of the catchment area is also to be completed. The limits to the area will be better defined, accumulation rates mapped, and accurate divergence measurements obtained along selected flow bands. These data are necessary for the accurate calculation of the mass balance of the West Antarctic Ice Sheet. Field work is to be conducted in 1988-89 and data reduction in 1989-90.