| 项目编号: | 1446200
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| 项目名称: | Using horizontal and vertical deformation signals to characterize water availability in fractured and faulted crystalline-rock aquifer systems |
| 作者: | Thomas Burbey
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| 承担单位: | Virginia Polytechnic Institute and State University
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| 批准年: | 2014
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| 开始日期: | 2015-03-01
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| 结束日期: | 2018-02-28
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| 资助金额: | USD270302
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | water-level
; potable groundwater
; research
; vertical deformation signal
; 2-day aquifer test
; regional fractured aquifer
; water level
; aquifer property
; fractured rock aquifer
; sub-regional flow system
; new analytical aquifer testing tool
; deformation signal
; horizontal rock deformation signal
; complex aquifer
; groundwater recharge
; assessment water
; much water
; distinct horizontal deformation signal
; seasonal water-level change
; seasonal signal
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| 英文摘要: | A large portion of the world's potable groundwater occurs in fractured bedrock, and these aquifers are difficult to characterize for how much water is available and how easily accessible it is. The ability to secure sustainable and significant quantities of potable groundwater from fractured and faulted crystalline-rock environments requires novel non-invasive ways to characterize these complex aquifers. Successful characterization depends upon accurate estimates of the parameters that govern flow, recharge, and storage capacity. Most fracture characterization relies on measurements of water levels or pressure changes in wells which have been shown to be inadequate for accurately estimating aquifer properties. This project will measure vertical and horizontal rock deformation signals at the land surface and within the borehole that result from pumping-induced stresses. This project will demonstrate the use of these data for characterizing local and regional fractured aquifers and for quantifying parameters that support assessment water recharge and flow in these systems. The results of this research will improve the estimation of the quantity of water that can be safely extracted from fractured rock aquifers. The investigation is focused on sites in Ploemeur, France, and in Virginia, USA, that will establish a collaboration between the University of Rennes and Virginia Tech that affords graduate students the opportunity to study abroad and broaden their research perspectives and international exposure.
The research will invoke surface horizontal and vertical deformation signals at different temporal and spatial scales to inversely calibrate a 3D coupled poromechanical and flow model to accurately estimate fracture and host rock properties (transmissivity and storage) and flow geometries (fracture or fault orientation and root depth). A local and a sub-regional flow system in the crystalline rocks near Ploemeur will be studied. Two distinct horizontal deformation signals exist there: a seasonal signal showing deformation associated with a gently dipping horizontal contact zone and a converging deformation signal oriented along strike of a sub-vertical fracture zone associated with a 2-day aquifer test. The Ploemeur site will be used to show how vertical deformation signals with seasonal water-level changes can be used to accurately quantify groundwater recharge. The research will develop a new analytical aquifer testing tool to estimate stress-dependent parameters based on data collected at the fractured rock site in Virginia. The results of this research improve upon traditional fracture tests using forced-gradient packer tests that have been shown not to work because the measured water-level and fracture strain are stress dependent. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/95087
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Thomas Burbey. Using horizontal and vertical deformation signals to characterize water availability in fractured and faulted crystalline-rock aquifer systems. 2014-01-01.
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