Department of Geoscience, Universityof Wisconsin-Madison, Madison, WI 53706, USA.
Ground Water. 2012 Sep-Oct;50(5):726-35. doi: 10.1111/j.1745-6584.2012.00913.x. Epub 2012 Feb 9.
Subsurface heterogeneity in hydraulic properties and processes is a fundamental challenge in hydrogeology. We have developed an improved method of borehole dilution testing for hydrostratigraphic characterization, in which distributed temperature sensing (DTS) is used to monitor advective heat movement. DTS offers many advantages over conventional technologies including response times in the order of seconds rather than minutes, the ability to profile temperature synoptically in a well without disturbing the fluid column, sensitivity to a wider range of flow rates than conventional spinner and heat pulse flow meters, and the ease of interpretation. Open-well thermal dilution tests in two multiaquifer wells near Madison, Wisconsin, provided detailed information on the borehole flow regimes, including flow rates and the locations of inflows from both fractures and porous media. The results led to an enhanced understanding of flow in a hydrostratigraphic unit previously conceptualized as homogenous and isotropic.
地下水力性质和过程的表层非均质性是水文地质学的一个基本挑战。我们已经开发出一种改进的钻孔稀释测试方法，用于水文地层特征描述，其中分布式温度传感 (DTS) 用于监测平流热运动。DTS 相对于传统技术具有许多优势，包括响应时间为数秒而不是数分钟，无需干扰流体柱即可在井中全面分析温度的能力，比传统的旋转式和热脉冲流量计更能感应更宽范围的流速，以及易于解释。威斯康星州麦迪逊附近的两口多含水层井中的开井热稀释测试提供了有关钻孔流态的详细信息，包括流量以及裂缝和多孔介质的流入位置。结果增强了对先前被概念化为均质各向同性的水文地层单元中水流的理解。
