论文标题
粘稠斑块附近的基底水力裂缝
Basal hydrofractures near sticky patches
论文作者
论文摘要
基底裂缝是冰盖和冰川底部的宏观结构不连续性。由观测和弹性断裂力学的动机，我们假设在存在基础水压的情况下，基础应力的空间变化可以促进和定位基础裂纹。我们在线性弹性断裂力学的理论背景下量化了这一过程。我们开发了一个评估剪切应力变化对基底裂缝生长的影响的模型。我们的结果表明，粘性斑块可以促进基底裂缝的启动，增加它们在冰中的传播长度，并在某些条件下为它们提供倾斜在上游的弯曲轨迹。对参数空间进行了详细的探索，以更好地了解粘质刺激引起的基底曲面可能发生在冰盖和冰川下的条件。
Basal crevasses are macroscopic structural discontinuities at the base of ice sheets and glaciers. Motivated by observations and the mechanics of elastic fracture, we hypothesise that in the presence of basal water pressure, spatial variations in basal stress can promote and localise basal crevassing. We quantify this process in the theoretical context of linear elastic fracture mechanics. We develop a model evaluating the effect of shear stress variation on the growth of basal crevasses. Our results indicate that sticky patches promote the initiation of basal crevasses, increase their length of propagation into the ice and, under some conditions, give them curved trajectories that incline upstream. A detailed exploration of the parameter space is conducted to gain a better understanding of the conditions under which sticky-patch-induced basal crevassing likely occurs beneath ice sheets and glaciers.
