Development and Placement of Instrumented Probes for Studies of Deforming Subglacial Till

OPP-00-85085 Harrison Echelmeyer首席调查人员将获得为期两年的资金，以开发将仪器探头插入阿拉斯加黑色急流冰川下几米主动变形的技术。最近的观察发现，冰川最活跃的部分下方有4至7米的耕层，冰川表面运动的近三分之二是由于冰盖底部几米处的过程。冰柜交界处的滑动可以忽略不计。在其他冰川下也观察到了TIL，在其中的许多冰川中，它可能会影响它们的流动模式。因此，发展一种研究厚、活性耕层流动的方法具有重要意义。首席调查员将使用热水钻头钻到收银机的顶部，然后用沉重的潜孔锤将探头钻入收银机，在不使用电线的情况下接收数据。目前，还没有足够的方法来研究在厚的、快速移动的冰层下原位耕作的行为。这项研究工作将开发出进行这些必要测量的方法。

AbstractOPP-00-85085HarrisonEchelmeyerThe Principal Investigators will be funded for two years to develop techniques for inserting instrumented probes into several meters of actively deforming till under the Black Rapids Glacier in Alaska. Recent observations have identified a four to seven meter till layer under the most active part of the Glacier, and that almost two-thirds of the surface motion of the glacier is due to processes acting in the bottom few meters of the till. There is negligible sliding at the ice-till interface. Till has been observed under other glaciers, and in many of them, it may affect their flow pattern. Therefore, it is important to develop a method for studying the flow of thick, active till. The Principal Investigators will drill to the to the top of the till using a hot-water drill and then drive the probes into the till with a heavy down-hole hammer and receive data without the use of wires. At the present time, there is no adequate way to investigate the behavior of tills in situ under thick, rapidly moving ice. This research effort would develop the means to make these essential measurements.