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首页> 外文期刊>Canadian Geotechnical Journal >Multi-scale hydrogeologic characterization of a leaky till-mantled fractured bedrock aquifer system
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Multi-scale hydrogeologic characterization of a leaky till-mantled fractured bedrock aquifer system

机译：渗漏耕作破裂的基岩含水层系统的多尺度水文地质表征

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The paper presents hydrogeologic properties for a leaky till-mantled fractured bedrock aquifer system based on geophysical and hydraulic tests performed at a drumlin located in northeastern Massachusetts, USA. The site profile consists of a fractured bedrock aquifer overlain by a 30 m thick unweathered, coarse-grained till aquitard. Steady state, decadal scale, hydraulics varied little until seasonal irrigation pumping was initiated in recent years, causing a substantial annual drawdown in the aquifer and leakage from the overlying till. High frequency hydraulic head data sets collected in monitoring wells record the hydraulic response to the irrigation pumping. These data sets, together with results from small scale slug and purge tests performed in monitoring wells, are used to characterize the hydrogeologic behavior of this groundwater system. Geophysical logging performed in bedrock wells confirmed the presence of numerous flowing fractures. The large-scale continuum analysis of the fractured bedrock aquifer response to the irrigation pumping yields transmissivity values consistent with those determined from the small-scale, short-term purge test results. The low hydraulic conductivity till has a significant impact on the drawdown behavior of the fractured bedrock aquifer. Calibrated values from the collective data sets and analyses result in the following properties for the 30 m thick unweathered till: hydraulic conductivity K' = 7.2 x 10(-9) m/s, transmissivity T' = 2.3 x 10(-8)m(2)/s, and storativity S' = 2.7 x 10(-4), and for the underlying fractured bedrock aquifer: T = 6.5 x 10(-6) m(2)/s with an average fracture aperture of 46 mu m and hydraulic conductivity K-f = 1.3 x 10(-3) m/s. These results should describe similar unweathered coarse-grained till-mantled fractured bedrock aquifer systems and provide useful data for preliminary analyses prior to any site-specific investigations.
机译：本文基于在美国马萨诸塞州东北部的一鼓林所进行的地球物理和水力试验，介绍了一种渗漏直至耕作破裂的基岩含水层系统的水文地质特性。场地剖面包括一个裂隙的基岩含水层，上面覆盖着30 m厚的未风化，粗粒直至阿奎塔德。直到近几年才开始季节性灌溉抽水，稳态，年代际规模，水力变化不大，导致含水层每年大量下降，并从上覆直至渗漏。在监控井中收集的高频液压头数据集记录了对灌溉泵的液压响应。这些数据集，以及在监测井中进行的小段塞和吹扫试验的结果，用于表征该地下水系统的水文地质行为。在基岩井中进行的地球物理测井证实存在大量流动裂缝。对裂缝基岩含水层对灌溉抽水的响应进行的大规模连续分析得出的透射率值与从小规模短期吹扫试验结果确定的透射率值一致。较低的水力传导率对裂隙的基岩含水层的沉降特性有重大影响。来自集体数据集和分析的校准值得出了30 m厚的未风化玻璃罐的以下特性：水力传导率K'= 7.2 x 10（-9）m / s，透射率T'= 2.3 x 10（-8）m （2）/ s，储能度S'= 2.7 x 10（-4），下层裂隙基岩含水层：T = 6.5 x 10（-6）m（2）/ s，平均裂隙孔径为46μ m和水力传导系数Kf = 1.3 x 10（-3）m / s。这些结果应描述类似的未风化的粗粒耕作至破裂的基岩含水层系统，并为任何现场特定调查之前的初步分析提供有用的数据。

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