Investigation of Dominant Controls on Electrical Properties of Granitic Regolith

花岗质风化层电特性的主导控制研究

• 批准号: 2219403
• 负责人: Qifei Niu
• 金额: $ 37.74万
• 依托单位: Boise State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2219403&HistoricalAwards=false
• 关键词: Investigation; Dominant; Controls; Electrical; Properties

The Earth's critical zone is the thin layer that extends from the top of the bedrock to the canopy of trees. Despite its relatively thin thickness, the critical zone plays a vital role in our society by providing life-sustaining resources such as water and food. Knowing the internal structure of the underground part of the critical zone is an important step that will help us understand and predict its role in global water, energy, carbon, and nutrient cycles. Geophysical imaging is used to "see" the unseen critical zone underneath the surface. However, the acquired geophysical images need to be translated into physical properties such as density, moisture content, and chemical composition that are understandable and usable to other scientists. This project will advance current understanding of the physical properties of geological materials in the critical zones by using a combination of laboratory and geophysical field investigations. The outcome of this project will help scientists better depict the subsurface of this thin but invaluable critical zone layer of the Earth. The researchers will investigate the dominant controls on the electrical properties of granitic regolith from a combination of field sampling, laboratory experiments, and theoretical modeling. Granitic regolith samples will be collected from the field, and their electrical properties, under controlled hydraulic states, will be measured using a newly developed soil column and a pressure plate extractor equipped with novel hydro-geophysical probes. Experimental data will be used to quantify the relative influences of hydraulic state, chemical weathering-induced textural change, and chemical weathering-induced mineralogy alternation on the electrical properties of the samples in both fully developed regolith and the weathering front. A new electrical model integrating chemical weathering will be developed to describe the entire regolith. This process-based understanding and modeling will enhance our ability to see into the complex underground environment and monitor various important subsurface processes. This project is jointly funded by the Hydrologic Sciences, the Established Program to Stimulate Competitive Research (EPSCoR), and Geobiology and Low Temperature geochemistry programs.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

地球的临界区是从基岩的顶部到树冠的薄层。尽管厚度相对较薄，但临界区域通过提供诸如水和食物之类的生命资源，在我们的社会中起着至关重要的作用。了解关键区域地下部分的内部结构是一个重要的步骤，它将帮助我们理解和预测其在全球水，能源，碳和营养周期中的作用。地球物理成像用于“查看”表面下方看不见的临界区域。但是，所获得的地球物理图像需要转化为物理特性，例如密度，水分含量和化学成分，这些特性是可以理解的，并且可用于其他科学家。该项目将通过结合实验室和地球物理野外研究的结合来提高关键区域地质材料物理特性的当前理解。该项目的结果将帮助科学家更好地描述地球这个薄但宝贵的临界区域的地下。研究人员将从场采样，实验室实验和理论模型的结合中研究花岗岩岩石的电性能的主要控制。将从现场收集花岗岩岩石样品，并将使用新开发的土壤柱和配备有新型水力地球物理探针的压力板提取器来测量其电气性能。实验数据将用于量化液压状态的相对影响，化学风化引起的纹理变化以及化学风化诱导的矿物学交替对完全发育的Regolith和Weathering Front的样品电气性能的相对影响。将开发出一种新的电气模型整合化学风化，以描述整个雷果石。这种基于过程的理解和建模将增强我们看到复杂地下环境并监视各种重要地下过程的能力。该项目由水文科学，既定的竞争研究计划（EPSCOR）以及地球生物学和低温地球化学计划共同资助。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响来通过评估来支持的。