Delineating Heterogeneous Aquifer Properties: Coupling Seismic, Hydraulic and Tracer Data

9316040戈雷里克对地下水非均质性的理解和描述是水文学中的一个重要问题。通常情况下，数据是稀疏的，但含水层的属性在空间上却有很大的差异。通过同时使用不同类型的数据来划定含水层的非均质性并确定水力参数值，可以确定比根据对每类数据本身的分析而绘制的图要准确得多的含水层属性图。事实上，对数据集的单独分析可能会导致含水层属性图彼此不一致。为了建立空间可变含水层性质的一致模拟模型，我们提出了井间地震层析成像与水头数据和溶质示踪剂数据相结合的耦合方法。通过对控制地震波传播、地下水流动和溶质运移的方程的数值解，将来自三个独立收集的数据集的测量结果合并到反方法中。我们使用“耦合模型”逆方法将模拟值与实测值进行匹配。提出了两项试点研究，以表明这一拟议研究工作的逻辑起点。我们将开发两种评估含水层属性的方法，并将它们应用于具有良好特征的萨凡纳河遗址。井间地震走时数据、示踪剂测试数据和水头数据都已在该地点收集。将根据我们两种方法的相对成功制定一种统一的方法。

9316040 Gorelick Understanding and describing subsurface heterogeneity is an important problem in hydrology. Typically, data are sparse and yet aquifers have properties that vary tremendously in space. By simultaneously using different tyes of data to delineate aquifer heterogeneities and determine hydraulic parameter values, maps of aquifer properties can be determined that are far more accurate than maps developed based on analysis of each type of data by itself. In fact, individual analysis of data sets may lead to maps of aquifer properties that are inconsistent with each other. In order to develop a consistent imate of spatially variable aquifer properties we propose to develop a coupled approach in which cross well seismic tomography is combined with hydraulic head data and solute tracer data. Measurements from the three independently collected data sets are incorporated into the inverse method through numerical solutions to the equations governing seismic wave propagation, groundwater flow, and solute transport. We match simulated values to measured values using a "coupled model" inverse approach. Two pilot studies are presented to indicate the logical starting point for this proposed research effort. We will develop two estimation approaches for aquifer property delineation and apply them to the Savannah River Site, which is well characterized. Cross well seismic traveltime data, tracer test data, and hydraulic head data have all been collected at this site. A unified approach will be developed based upon the relative success of our two approaches.