Geophysical Measurements to Determine the Hydrologic Partitioning of Snowmelt on a Snow‐Dominated Subalpine Hillslope
Geophysical Measurements to Determine the Hydrologic Partitioning of Snowmelt on a Snow‐Dominated Subalpine Hillslope
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DOI：
10.1029/2017wr021324
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发表时间：
2018-06
影响因子：
5.4
通讯作者：
D. Thayer;A. Parsekian;K. Hyde;H. Speckman;D. Beverly;B. Ewers;Matt Covalt;Nadia Fantello;T. Kelleners;N. Ohara;T. Rogers;W. Holbrook
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作者：
D. Thayer;A. Parsekian;K. Hyde;H. Speckman;D. Beverly;B. Ewers;Matt Covalt;Nadia Fantello;T. Kelleners;N. Ohara;T. Rogers;W. Holbrook
在美国西部山间的亚高山流域，积雪融化是水文系统的主要水输入。这项工作的主要重点是了解在融雪期和生长季节的其余部分从积雪水的分区。我们进行了一项时间推移电阻率断层扫描（ERT）研究，并结合水收支分析，以跟踪从降雪季节到降雪季节（2015年5月至8月）的水。地震速度提供了一个估计的风化层厚度，而蒸腾测量针叶树液流提供了深入了解根吸水。我们观察了四个水文过程时期，发现深层水流和树木水通量是水从山坡流出的主要途径。漫流和合流可以忽略不计。我们观察到的时间变化，包气带水含量超过3.0米以下的表面。我们的研究结果表明，垂直流通过薄土幔覆盖粗崩积风化层的主要途径，当地的潜水含水层。
In subalpine watersheds of the intermountain western United States, snowpack melt is the dominant water input to the hydrologic system. The primary focus of this work is to understand the partitioning of water from the snowpack during the snowmelt period and through the remainder of the growing season. We conducted a time‐lapse electrical resistivity tomography (ERT) study in conjunction with a water budget analysis to track water from the snow‐on through snow‐off season (May–August 2015). Seismic velocities provided an estimate of regolith thickness while transpiration measurements from sap flow in conifer trees provided insight into root water uptake. We observed four hydrologic process‐periods and found that deep flow and tree water fluxes are the primary pathways through which water moves off of the hillslope. Overland flow and interflow were negligible. We observed temporal changes in vadose zone water content more than 3.0 m below the surface. Our results show that vertical flow through the thin soil mantle overlaying coarse colluvial regolith was the primary pathway to a local unconfined aquifer.