Monitoring the thermal state of permafrost by automated time-lapse capacitive resistivity imaging

通过自动延时电容电阻率成像监测永久冻土的热状态

基本信息

批准号：
NE/I000917/1
负责人：
Oliver Kuras
金额：
$ 16.06万
依托单位：
British Geological Survey
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FI000917%2F1
关键词：
Monitoring thermal state permafrost automated

项目摘要

Long-term monitoring of subsurface processes increasingly relies on intelligent, systematic data collection by innovative field sensors. The aim of the proposed project is to develop a new technology concept for the non-invasive volumetric imaging and routine temporal monitoring of the thermal state of permafrost. Permafrost has been identified as one of six cryospheric indicators of global climate change within the monitoring framework of the World Meteorological Organization (WMO) Global Climate Observing System (GCOS). Changes in permafrost temperature, associated with the freezing or thawing of pore water, result in significant changes in electrical resistivity. Non-invasive assessment and volumetric monitoring of resistivity changes are facilitated by 4D Electrical Resistivity Tomography (ERT). Tomographic reconstruction with appropriate spatial and temporal resolution enables intuitive visualisation and opens up the important opportunity for quantitative analysis of freeze and thaw processes, including the calibration to permafrost temperature. However, despite the broad appeal of conventional ERT methodology, electrical sensors require galvanic coupling with the ground. In permafrost regions, metal electrodes must be physically implanted into the active layer, which is subject to seasonal freezing and thawing. This can lead to significant practical limitations on field measurements due to high levels of and large variations in contact resistances between sensors and the host bedrock, soil or building material as it freezes and thaws. Using a novel capacitively-coupled ERT approach, we propose to demonstrate the technical feasibility of undertaking time-lapse tomographic measurements using permanent, in-situ capacitive sensors to remotely monitor the thermal state of permafrost. This will lead to significant improvements in monitoring capability, both for permafrost simulation experiments in the laboratory and for practical applications in the field. The work will include numerical simulation to determine optimal distributed capacitive sensor networks required for volumetric imaging and long-term monitoring of permafrost, both at the field and at the laboratory scale. Based on the results, a measurement system for multi-sensor automated time-lapse data acquisition will be designed and a viable architecture for a laboratory prototype system will be established. Subsequently, a functional benchtop prototype will be developed and technical feasibility of multi-sensor data acquisition and automated operation will be demonstrated. Finally, we will validate the concept of making automated time-lapse temperature-calibrated CRI measurements in controlled laboratory experiments that simulate permafrost growth, persistence and thaw in bedrock.

对地下过程的长期监控越来越依赖于创新的现场传感器收集智能的系统数据。拟议项目的目的是开发一种新的技术概念，用于对永久冻土热状态的非侵入性体积成像和常规时间监测。永久冻土已被确定为世界气象组织监测框架（WMO）全球气候观察系统（GCOS）中全球气候变化的六个冰冻圈指标之一。与孔隙水的冷冻或解冻有关的多年冻土温度的变化导致电阻率的显着变化。 4D电阻率断层扫描（ERT）促进了电阻率变化的非侵入性评估和体积监测。通过适当的空间和时间分辨率进行的层析成像重建可以实现直观的可视化，并为冻结和解冻过程（包括校准到永久冻土温度）开辟了重要的机会。然而，尽管传统的ERT方法论具有广泛的吸引力，但电气传感器仍需要与地面进行电流耦合。在多年冻土区域中，金属电极必须物理植入活性层，该层需要季节性冷冻和解冻。由于传感器和宿主基岩，土壤或建筑材料之间的接触电阻的高度变化，这可能会导致对现场测量的显着限制，因为它冻结和融化。我们使用一种新型的电容耦合的ERT方法，建议证明使用永久的，原位的电容式传感器进行延时断层扫描测量的技术可行性，以远程监测多年冻土的热状态。这将导致监测能力的显着改善，包括实验室中的多年冻土模拟实验以及该领域的实际应用。这项工作将包括数值模拟，以确定在田间和实验室尺度上进行体积成像和长期监测所需的最佳分布式电容传感器网络。根据结果，将设计用于多传感器自动延时数据采集的测量系统，并将建立实验室原型系统的可行体系结构。随后，将开发功能性的台式原型，并将展示多传感器数据采集和自动化操作的技术可行性。最后，我们将验证在受控实验室实验中进行自动延时温度校准的CRI测量值的概念，以模拟基岩中的永久冻土生长，持久性和解冻。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Encyclopedia of Solid Earth Geophysics

DOI：
10.1007/978-3-030-10475-7
发表时间：
2020
期刊：
Encyclopedia of Earth Sciences Series
影响因子：
0
作者：
D. James
通讯作者：
D. James

The use of capacitive resistivity imaging (CRI) for monitoring laboratory experiments simulating permafrost growth, persistence and thaw in bedrock

使用电容电阻率成像 (CRI) 监测模拟基岩中永久冻土生长、持久性和融化的实验室实验

DOI：
发表时间：
2012
期刊：
AGU Fall Meeting Abstracts
影响因子：
0
作者：
Kuras O.
通讯作者：
Kuras O.

Monitoring rock freezing and thawing by novel geoelectrical and acoustic techniques

DOI：
10.1002/2016jf003948
发表时间：
2016-12
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
0
作者：
J. Murton;O. Kuras;M. Krautblatter;T. Cane;D. Tschofen;S. Uhlemann;Sandra Schober;P. Watson
通讯作者：
J. Murton;O. Kuras;M. Krautblatter;T. Cane;D. Tschofen;S. Uhlemann;Sandra Schober;P. Watson

Recent developments in the direct-current geoelectrical imaging method