Satellite imagery reveals flowstripes on Foundation Ice Stream parallel to ice flow, and meandering features on the ice-shelf that cross-cut ice flow and are thought to be formed by water exiting a well-organised subglacial system. Here, ice-penetrating radar data show flow-parallel hard-bed landforms beneath the grounded ice, and channels incised upwards into the ice shelf beneath meandering surface channels. As the ice transitions to flotation, the ice shelf incorporates a corrugation resulting from the landforms. Radar reveals the presence of subglacial water alongside the landforms, indicating a well-organised drainage system in which water exits the ice sheet as a point source, mixes with cavity water and incises upwards into a corrugation peak, accentuating the corrugation downstream. Hard-bedded landforms influence both subglacial hydrology and ice-shelf structure and, as they are known to be widespread on formerly glaciated terrain, their influence on the ice-sheet-shelf transition could be more widespread than thought previously.

中文翻译：

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坚硬的岩石地貌通过集中在基础波纹中的水产生130公里的冰架通道。

卫星图像显示出与冰流平行的基础冰河上的水流条纹，以及冰架上蜿蜒的特征，这些特征横切了冰流，并被认为是由于水从结构良好的冰河系统中流出而形成的。在这里，穿透冰的雷达数据显示了在地下冰层下方与水流平行的硬床地貌，以及在蜿蜒的地面通道下方向上切入冰架的通道。当冰过渡到浮选时，冰架上会合并起因于地形的褶皱。雷达揭示了地貌旁边存在冰川下的水，这表明排水井井井有条，其中水作为点源从冰原中流出，与空腔水混合并向上切成波纹峰，从而加剧了下游的波纹。