CAREER: Wavelet Analysis of Scale Effects on Subsurface Flow and Transport

职业：地下流动和输运尺度效应的小波分析

• 批准号: 0520995
• 负责人: Roseanna Neupauer
• 金额: $ 31.87万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0520995&HistoricalAwards=false
• 关键词: CAREER; Wavelet; Analysis; Scale; Effects

0237702NeupauerSpatial variability of aquifer properties affects the movement and spread of contaminants in the subsurface. Since a complete spatial representation of the heterogeneous aquifer properties cannot be obtained, predictions of solute movement through porous media contain uncertainty. An understanding of the spatial variability of aquifer properties and their effects on flow and transport is essential for making reliable predictions of solute transport, a necessary component of optimal design of remediation systems, risk assessment, siting of water supply wells, and others. Aquifer heterogeneity occurs at multiple scales; however, measurements of aquifer properties are often made at only a limited number of scales. These measurement scales may not correspond to the scales that control subsurface flow and transport. In this study, we will analyze dominant scales of aquifer properties that affect groundwater flow and solute transport and identify relationships between dominant scales and physical and chemical heterogeneity of aquifer properties. Continuous wavelet transforms (CWT) will be used to extract scale information from data sets of the spatial distribution of aquifer properties and system states (hydraulic head and solute concentration). The CWT is a tool that extracts local information at multiple scales. The technique will be developed and tested using synthetic data sets and numerical simulations. It will subsequently be used with data from laboratory- and field-scale flow and transport experiments to identify dominant scales of aquifer properties; the evolution of dominant scales of system states; and the relationships between dominant scales, the degree of heterogeneity, and the effects on solute transport. Knowledge of the dominant scales of flow and transport and the relationship between them and aquifer heterogeneity will facilitate more targeted sampling for aquifer characterization and improved predictions of subsurface flow and transport.The educational goals are to teach students to recognize variability and uncertainty in physical systems and to perform engineering design and analysis that accounts for this uncertainty; to improve science and engineering education by emphasizing the practical applications of engineering and science knowledge; and to encourage women and underrepresented minorities to consider technical fields. They will be achieved through exposure to realistic, complex data sets for analysis and design; practical hands-on activities to accompany lectures; and outreach activities to promote science and engineering fields to underrepresented minorities and women.

0237702 Neupauer含水层特性的空间变异性影响地下污染物的移动和扩散。 由于不可能获得非均质含水层特性的完整空间表示，因此通过多孔介质的溶质运动预测包含不确定性。 了解含水层特性的空间变异性及其对水流和运输的影响，对于可靠地预测溶质运输是至关重要的，这是修复系统、风险评估、供水威尔斯选址等优化设计的必要组成部分。含水层的异质性存在于多个尺度上;然而，含水层特性的测量往往只在有限的尺度上进行。这些测量尺度可能与控制地下水流和输运的尺度不一致。 在这项研究中，我们将分析影响地下水流和溶质运移的含水层性质的主导尺度，并确定主导尺度与含水层性质的物理和化学异质性之间的关系。 连续小波变换将用于从含水层特性和系统状态（水头和溶质浓度）的空间分布数据集中提取尺度信息。CWT是一种在多个尺度上提取局部信息的工具。该技术将使用合成数据集和数值模拟进行开发和测试。随后将使用实验室和现场规模的流量和运输实验的数据，以确定主要规模的含水层特性;系统状态的主导规模的演变;和主导规模之间的关系，异质性的程度，溶质运移的影响。 了解水流和运移的主要规模及其与含水层异质性之间的关系，将有助于更有针对性地取样，以确定含水层的特性，并改进对地下水流和运移的预测，教育目标是教学生认识物理系统的可变性和不确定性，并进行工程设计和分析，以解决这种不确定性;通过强调工程和科学知识的实际应用来改善科学和工程教育;鼓励妇女和代表性不足的少数民族考虑技术领域。实现这些目标的途径是接触用于分析和设计的现实、复杂的数据集;配合讲座开展实际动手活动;开展外联活动，向代表性不足的少数群体和妇女宣传科学和工程领域。