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

该项目支持完成南极B冰流的摄影测量。这项工作的成果包括：1)精确的流量计算，以改进质量平衡的确定；2)流动扰动的描述，以显示冰流侧面和基本特征在控制流动中的影响；3)力平衡的计算，以产生可在基础力学中解释的基本阻力和滑动速度图。集水区的勘测工作也将完成。将更好地定义该区域的界限，绘制累积率图，并沿选定的流带获得准确的发散测量结果。这些数据对于准确计算西南极冰盖的物质平衡是必要的。实地工作将在1988-89年度进行，数据整理工作将在1989-90年度进行。

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.