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Fully Coupled Hydrogeophysical Inversion of Salt-Tracer Experiments

盐示踪实验的全耦合水文地球物理反演

基本信息

批准号：
172142440
负责人：
Professor Dr.-Ing. Olaf A. Cirpka
金额：
--
依托单位：
Arbeitsgruppe Hydrogeologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/172142440?language=en
关键词：
Fully Coupled Hydrogeophysical Inversion Salt

项目摘要

Estimating hydraulic conductivity in heterogeneous aquifers remains a challenge of groundwater hydraulics. The propagation of salt plumes, introduced during controlled-release experiments, can be monitored by time-lapse electrical-resistivity tomography (ERT) using multiple combinations of current and potential electrodes. So far, the analysis of these ERT data has been cumbersome, because the inversion produces concentration images that still need to be interpreted in a hydraulic context. In a preceding project, we have developed a fully coupled hydrogeophysical inversion method for ERT data obtained during salt-tracer tests. The time series of electrical signals are characterized by their temporal moments. Temporal moment-generating equations allow approximating the mean breakthrough time of the electrical signal from flow and concentrationmoment equations without solving transient equations. These equations have been integrated into a geostatistical inversion method to infer the hydraulic-conductivity distribution from ERT data. The method has been applied to artificially generated test cases. Within the proposed one-year extension project, we will perform several series of salt-tracer tests in a quasi two-dimensional sandbox with increasingly complex fillings, monitor the experiments by time-lapse ERT, and invert their temporal moments with the fully coupled hydrogeophysical inversion method. We will simulate the transient concentration distributions with the inferred hydraulic conductivity fields and compare them to images taken during the experiments.

非均质含水层导水系数的估算一直是地下水水力学研究的一个难题。控制释放实验期间引入的盐羽的传播可以通过使用电流和电位电极的多种组合的延时电阻率层析成像（ERT）来监测。到目前为止，这些ERT数据的分析一直很麻烦，因为反演产生的浓度图像，仍然需要在水力环境中进行解释。在前一个项目中，我们已经开发了一个完全耦合的水文地球物理反演方法的ERT数据盐示踪剂试验期间获得。电信号的时间序列的特征在于它们的时间矩。时间矩生成方程允许近似的平均突破时间的电信号从流量和concentrationmoment方程，而无需求解瞬态方程。这些方程已被集成到一个地质统计学反演方法来推断从ERT数据的导水率分布。该方法已应用于人工生成的测试用例。在拟议的为期一年的扩展项目，我们将进行几个系列的盐示踪剂测试，在一个准二维沙箱越来越复杂的填充物，监测实验的延时ERT，并反演其时间矩与完全耦合的水文地球物理反演方法。我们将模拟与推断的水力传导率场的瞬态浓度分布，并将它们与实验期间拍摄的图像进行比较。