CAREER: Integrated Stratigraphic and Hydrogeologic Aquifer Analysis: Toward Improved Multi-scale Characterization of Alluvial Aquifer Systems

职业：综合地层和水文地质含水层分析：改进冲积含水层系统的多尺度表征

• 批准号: 0133666
• 负责人: Gary Weissmann
• 金额: $ 38万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-05-01 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0133666&HistoricalAwards=false
• 关键词: CAREER; Integrated; Stratigraphic; Hydrogeologic; Aquifer

0133666WeissmannAccurate modeling and prediction of contaminant transport and fate in groundwater systems requires that we produce detailed aquifer characterizations. Recently, the PI and colleagues developed a novel sequence stratigraphic approach to characterizing hydrofacies distributions for use in groundwater models on a stream-dominated alluvial fan system, thus integrating geological and hydrological assessment. Several questions resulted from this work that guides this proposed research project, including: 1) do sequences and systems tracts exist in other alluvial fan systems; 2) do sequences, bounded by clay-rich mature paleosols, compartmentalize groundwater flow into hydrostratigraphic units; and 3) can sequence stratigraphy provide a framework for improved groundwater modeling on other alluvial fan systems. Through sedimentologic, paleopedologic, and hydrogeologic analysis at the Lawrence Livermore National Laboratory (LLNL), a site with extensive core, geophysical well log, and 3D hydrologic test data, we intend to test hypotheses formed from these questions. Preliminary work at the LLNL site indicates that mature paleosols may bound hydrostratigraphic units, thus indicating that paleosol bounded sequences exist and that sequence geometry may strongly influence aquifer hydrodynamics. Through this work, we will (1) describe about 6000 meters of previously collected core, (2) assess paleosol morphology and chemistry, (3) model the stratigraphy, multi-scale facies distributions, groundwater flow, and contaminant transport within this complex aquifer system, and (4) assess data value to evaluate minimum data requirements for future work in similar geologic settings. These models will be tested against aquifer test and contaminant concentration data. A major objective of this work is to involve many student researchers in this project, thus several students will be directly involved in daily research activities. Additionally, aspects of this research will be incorporated into classroom activities, where students in an aquifer and petroleum reservoir assessment course will analyze core, construct the 3-D stratigraphic framework at a small site, and model the heterogeneity at the site. This will not only expose students to the research project, but will provide multiple 'realizations' of the stratigraphic character for uncertainty assessment of the modeling results.

0133666 Weissmann地下水系统中污染物迁移和归宿的精确建模和预测要求我们提供详细的含水层特征。 最近，PI及其同事开发了一种新的层序地层学方法，用于描述河流为主的冲积扇系统的地下水模型中使用的水文相分布，从而整合了地质和水文评估。 从这项工作中产生的几个问题，指导这项拟议的研究项目，包括：1）序列和体系域存在于其他冲积扇系统; 2）序列，富粘土的成熟古土壤，划分地下水流到水文地层单位;和3）层序地层学可以提供一个框架，改善地下水模拟其他冲积扇系统。 通过在劳伦斯利弗莫尔国家实验室（LLNL）进行沉积学、古土壤学和水文地质学分析，我们打算检验从这些问题中形成的假设。 在LLNL网站的初步工作表明，成熟的古土壤可能约束水文地层单位，从而表明古土壤有界序列存在，序列的几何形状可能会强烈影响含水层的水动力。 通过这项工作，我们将（1）描述约6000米以前收集的核心，（2）评估古土壤形态和化学，（3）模拟地层，多尺度相分布，地下水流，污染物在这个复杂的含水层系统中的传输，（4）评估数据价值，以评估未来在类似地质环境中工作的最低数据要求。 这些模型将根据含水层测试和污染物浓度数据进行测试。 这项工作的一个主要目标是让许多学生研究人员参与这个项目，因此一些学生将直接参与日常研究活动。 此外，这项研究的各个方面将被纳入课堂活动，在含水层和石油储层评估课程的学生将分析核心，在一个小网站构建三维地层框架，并在现场的异质性建模。 这不仅会让学生接触到研究项目，而且会为建模结果的不确定性评估提供地层特征的多重“实现”。