Quantifying Dynamic Water Storage in Unsaturated Bedrock with Borehole Nuclear Magnetic Resonance

Quantifying Dynamic Water Storage in Unsaturated Bedrock with Borehole Nuclear Magnetic Resonance
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利用钻孔核磁共振量化非饱和基岩中的动态储水量

DOI:
10.1029/2020gl089600
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发表时间:
2020
影响因子:
5.2
通讯作者:
Rempe, Daniella
Rempe, Daniella
中科院分区:
地球科学1区
文献类型:
--
作者:
Schmidt, Logan;Rempe, Daniella

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量化地下水的储存量对于研究生态系统的水可用性、边坡稳定性和水岩相互作用至关重要。在各种环境中,水以岩石水分的形式储存在断裂和风化的基岩中。然而,很少有技术可用于测量非饱和岩石中的岩石水分,使得难以获得水储存动态的直接估计。在这里,我们使用钻孔核磁共振(NMR)在季节性干燥的加州的两个网站,以量化动态岩石水分储存。我们表现出很强的NMR估计的动态存储和来自中子测井和质量平衡技术的估计之间的协议。动态贮水深度可达9 m,反映了根系吸水的深度范围。据我们所知,这些数据是第一个量化的体积和深度的动态水存储在基岩包气带通过钻孔核磁共振。
Quantifying the volume of water that is stored in the subsurface is critical to studies of water availability to ecosystems, slope stability, and water‐rock interactions. In a variety of settings, water is stored in fractured and weathered bedrock as rock moisture. However, few techniques are available to measure rock moisture in unsaturated rock, making direct estimates of water storage dynamics difficult to obtain. Here, we use borehole nuclear magnetic resonance (NMR) at two sites in seasonally dry California to quantify dynamic rock moisture storage. We show strong agreement between NMR estimates of dynamic storage and estimates derived from neutron logging and mass balance techniques. The depths of dynamic storage are up to 9 m and likely reflect the depth extent of root water uptake. To our knowledge, these data are the first to quantify the volume and depths of dynamic water storage in the bedrock vadose zone via borehole NMR.
DOI: --
发表时间: 1981
期刊:
影响因子: --
作者:
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