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

9316040 Gorelick理解和描述地下非均匀性是水文学中的一个重要问题。 通常情况下，数据是稀疏的，但含水层的性质在空间上有很大的差异。 通过同时使用不同类型的数据来描绘含水层非均质性并确定水力参数值，可以确定含水层特性图，其比基于对每种类型数据本身的分析而开发的图精确得多。 事实上，对数据集进行单独分析可能会导致含水层特性图彼此不一致。 为了开发一个一致的模拟空间变化的含水层属性，我们建议开发一个耦合的方法，其中井间地震层析成像相结合的水头数据和溶质示踪剂数据。 从三个独立收集的数据集的测量被纳入到逆方法通过数值解的地震波传播，地下水流和溶质运移的方程。 我们使用“耦合模型”逆方法将模拟值与测量值相匹配。 两个试点研究表明，这一拟议的研究工作的逻辑起点。 我们将开发两种估计方法，含水层属性划定，并将其应用到萨凡纳河网站，这是很好的特点。 井间地震走时资料、示踪剂试验资料和水头资料均在该场地采集。 将根据我们两种方法的相对成功来制定统一的方法。

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.