Internal structure and hydrological functions of an alpine proglacial moraine
Internal structure and hydrological functions of an alpine proglacial moraine
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高山冰期冰碛的内部结构和水文功能
DOI：
10.1002/hyp.8144
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发表时间：
2011
影响因子：
3.2
通讯作者：
A. Pidlisecky
中科院分区：
文献类型：
--
作者：
G. Langston;L. Bentley;M. Hayashi;A. McClymont;A. Pidlisecky
了解高山流域的地下水过程对于了解水源和下游环境的放水时间和后期水流至关重要。冰雹和距骨特征可以在高山流域的地下水流动和储存过程中发挥重要作用，但这两个过程对这些特征都没有很好的了解。我们研究了加拿大落基山脉奥哈拉湖分水岭中部分被冰芯覆盖的冰原的复杂水文地质环境。电阻率成像(ERI)和地震折射层析成像描绘了埋藏的冰和冻结的和未冻结的冰凌物质的区域。地震折射数据也清楚地显示了基岩的深度，这主要是由于上覆冰川物质的厚度而不同。一个湖的水位和冰雹上的几个油布对降雨、积雪融化和冰川融化的输入做出了不同的反应，表明这些特征与冰雹地下水流动系统的水文联系程度不同。这种差异反映了基岩地形和埋藏冰的位置和几何形状的影响。探地雷达图像和ERI显示了潜伏地下水和集中渗入的区域。这些区域的位置似乎受到埋藏的冰的控制。所有地球物理和水文数据都表明，相对较薄(5米)的饱和沉积层和/或破碎的基岩可能提供了冰雹内的主要水流系统。版权所有©2011 John Wiley&Sons，Ltd.
Understanding groundwater processes in alpine watersheds is critical to understand the timing of water release and late‐season stream flow for both headwater and downstream environments. Moraines and talus features can play an important role in groundwater flow and storage processes in alpine watersheds, but neither process is well understood for these features. We examined the complex hydrogeological environment of a partially ice‐cored moraine in the Lake O'Hara watershed in the Canadian Rockies. Electrical resistivity imaging (ERI) and seismic refraction tomography delineated regions of buried ice and frozen and unfrozen moraine material. Seismic refraction data also clearly indicated the depth to bedrock, which varied primarily due to the thickness of the overlying moraine material. Water levels in a lake and several tarns on the moraine responded differently to inputs of rain, snowmelt, and glacier melt, indicating the different degree of hydrological connectivity of these features to the groundwater flow system in the moraine. Such differences reflect the effects of bedrock topography and the location and geometry of buried ice. Ground‐penetrating radar images and ERI indicated regions of perched groundwater and focused infiltration. The location of these regions appears to be controlled by buried ice. All geophysical and hydrological data suggest that a relatively thin (<5 m) layer of saturated sediments and/or fractured bedrock likely provides a major flow system within the moraine. Copyright © 2011 John Wiley & Sons, Ltd.
影响因子：
5
作者：
C. Hilbich;L. Marescot;C. Hauck;M. Loke;R. Mäusbacher
通讯作者：
C. Hilbich;L. Marescot;C. Hauck;M. Loke;R. Mäusbacher