Development of a proof-of-concept geoelectric monitoring system for advancing research and education in hydrogeophysics at Boise State University

开发概念验证地电监测系统，以推进博伊西州立大学的水文地球物理学研究和教育

• 批准号: 2054805
• 负责人: Qifei Niu
• 金额: $ 12.32万
• 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: 2021
• 资助国家: 美国
• 起止时间: 2021-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2054805&HistoricalAwards=false
• 关键词: Development; proof; concept; geoelectric; monitoring

Groundwater is a valuable resource for our society and the ecosystem. It is critical to understand how climate change and human activities affect the storage, age, quality, and the flow route of groundwater. Geoelectrical methods, which use either natural electric current or active electric sources, are important geophysical tools for studying these hydrological problems. It enables an effective determination of the water distribution and their movement in the subsurface with minimal disturbances to the field condition. This award will support scientific infrastructure by developing the next-generation geoelectrical instrumentation for groundwater-related studies and education. This award will also help broaden the participation of undergraduate students in hydrological and geophysical research at Boise State University.This proof of concept project will develop a new hydrogeophysical instrument by integrating traditional hydrological measurement into geoelectrical field tests. Newly designed hydrogeophysical probes will be fabricated in the laboratory by integrating Ag-AgCl electrodes into traditional tensiometers. These developed probes can simultaneously measure the soil tension (matric suction) and electrical properties (resistivity, induced polarization, and electrokinetic potential) when they are integrated into a traditional geoelectrical acquisition instrument. In this project, laboratory experiments are planned to measure the main characteristics of the probes such as drifting and temperature coefficient, and a field test is planned to monitor the snowmelt infiltration process in a soil pit. The field monitoring will be conducted at a mountain ridge in a small catchment of the Dry Creek Experimental Watershed near Boise, Idaho. The monitored hydraulic and geoelectrical data will be jointly analyzed to evaluate the performance of the integrated hydrogeophysical instrument at field conditions. This award received co-funding from the Established Program to Stimulate Competitive Research (EPSCoR) office.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.

地下水是人类社会和生态系统的宝贵资源。了解气候变化和人类活动如何影响地下水的储存、年龄、质量和流动路线是至关重要的。地电方法是研究这些水文问题的重要地球物理工具，它使用自然电流或有源电源。它可以有效地确定水的分布及其在地下的运动，对现场条件的干扰最小。该合同将通过开发用于地下水相关研究和教育的下一代地电仪器来支持科学基础设施。该奖项还将有助于扩大博伊西州立大学本科生对水文和地球物理研究的参与。这个概念验证项目将开发一种新的水文地球物理仪器，将传统的水文测量与地电场测试相结合。新设计的水文地球物理探测器将在实验室中通过将Ag-AgCl电极集成到传统的张力计中来制造。这些开发的探针可以同时测量土壤张力（基质吸力）和电性能（电阻率、感应极化和电动势），当它们集成到传统的地电采集仪器中时。本项目拟进行室内试验，测量探针的漂移、温度系数等主要特性；拟进行现场试验，监测土壤坑内融雪入渗过程。实地监测将在爱达荷州博伊西附近干溪实验流域的一个小集水区的山脊上进行。将对监测的水力和地电数据进行联合分析，以评估综合水文地球物理仪器在野外条件下的性能。该奖项得到了EPSCoR办公室的共同资助。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。