Collaborative Res: Assessing Aquifer Properties from Stress and Strain Distributions in Leaky-Confined Aquifers using Insar, GPS and Three-Dimensional Deformation and Flow Modeling

0106474布尔贝含水层测试通常涉及收集抽水井附近的时间下降数据，目的是制作用于估计含水层或含水层系统的存储系数和transmittance的图。 全球定位系统技术和干涉合成孔径雷达卫星图像的最新进展使得能够详细和精确地计算地表位移。 在主动抽水试验期间，固定GPS监测结合同一地区的干涉合成孔径雷达干涉图，将允许收集时间压缩（和时间水平应变）数据，并结合水文数据，为估计承压含水层的蓄水系数提供更有诊断意义的试验。 此外，在越流含水层系统中，封闭单元是主要的可压缩单元，时间压实数据可以提供必要的信息，以准确地计算specric存储和垂直水力传导性的封闭单元，参数通常是难以评估。 本文提出了一种新的解析解，根据时间-沉降数据和数值模拟结果，推导出了该半对数的储存系数（conrined）和semi-log（leaky）方法表明，可以对含水层的储存量以及封闭单元的储存量和垂直导水率进行非常精确的估计。GPS和干涉合成孔径雷达测量还将提供有关在陆地表面，并可以证实三维变形和流动的假设建模的结果，这表明超过50%的抽水是从封闭含水层中与水平应变相关的储存中释放出来的。 这些结果可能有巨大的影响，测量沉降，实际上可以预期通过封闭单元的泄漏量，并解释长期含水层测试。 此外，在存在三维应变的情况下，通过限制单元的应变配置将大不相同，这将影响随着时间的推移通过限制单元的潜在压实和泄漏。 水的潜在贡献来自水平应变，这可能要求我们重新考虑目前的存储系数的定义，这种应变已被忽略。

0106474BurbeyAquifer tests typically involve collecting time-drawdown data in the vicinity of a pumping well for the purpose of producing plots for estimating the storage coefficient and transmissivity of the aquifer or aquifer system. Recent advances in GPS technology and INSAR (interferometric synthetic aperture radar) satellite imagery, allow for detailed and precise calculation of land surface displacements. Stationary GPS monitoring during an active pumping test in conjunction with INSAR interferograms for the same region will allow for time-compaction (and time-horizontal strain) data to be collected in conjunction with the hydrograph data providing a far more diagnostic test for estimating storage coefiricient of confined aquifers. Furthermore, in leaky aquifer systems in which the confining unit is the primary compressible unit, the time-compaction data can provide the necessary information to accurately calculate the speciric storage and vertical hydraulic conductivity of the confining unit, parameters that are typically difficult to evaluate. A new analytical solution has been developed to derive the storage coefficient from time-subsidence data and numerical simulation results applied to this semi-log (conrined) and semi-log (leaky) methodology indicates that extremely accurate estimates for storage of the aquifer and storage and vertical hydraulic conductivity of the confining unit can be made.GPS and INSAR surveys will also provide detailed information on horizontal deformation occurring at the land surface and can corroborate results from hypothetical modeling of three-dimensional deformation and flow, which indicate that more than 50 percent of pumped water is released from storage associated with horizontal strain in confined aquifers. These results may have tremendous implications with regard to measuring subsidence, the quantity of leakage that can actually be expected through confining units, and the interpretation of long-term aquifer tests. Furthermore, the strain configuration through the confining unit will be much different in the presence of three-dimensional strain, which will affect the potential compaction and leakage through the confining unit over time. The potential contribution of water from horizontal strain may require us to rethink the current definition of storage coefficient where such strains have been neglected.