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Groundwater level monitoring for hydraulic characterization of an unconfined aquifer by common mid-point measurements using GPR

Abstract

Because of its limited bandwidth, ground penetrating radar (GPR) signal has an oscillating character that degrades the ability to distinguish reflection events and introduces an error in the velocity analysis. In this paper, we use the analytic signal to calculate the envelope velocity spectrum, which is void of the oscillating nature of a GPR wavelet. A comparison study on a synthetic common mid-point (CMP) gather demonstrates that the envelope velocity spectrum gives a more robust velocity estimation. We applied this technique to explore the potential of GPR for monitoring the pumping-induced groundwater level change, then estimating the hydraulic properties of an aquifer in Ulaanbaatar, the capital of Mongolia. A field survey was conducted along three different directions when a production well was under pumping and static conditions. In addition, a simple velocity picking scheme was suggested based on the maximum coherency curve. From the velocity picks, the vertical profiles of interval electromagnetic velocity and water content were estimated. The groundwater table was easily identified in these profiles. The groundwater level changes under the CMP sounding locations along the northeast and north survey lines were estimated to be 27 and 23 cm, respectively, whereas it failed to detect the groundwater level change on the northwest survey line because of the effect of strong scatterers near the groundwater table. The estimated groundwater level change was input into the unconfined aquifer model for estimating the hydraulic conductivity, which yields comparable results with a previous study. We conclude that the hydraulic parameter estimation using GPR is much easier and effective than the conventional hydraulic test methods.


ISSN: 1083-1363
EISSN: 1943-2658
Serial Title: Journal of Environmental & Engineering Geophysics
Serial Volume: 19
Serial Issue: 4
Title: Groundwater level monitoring for hydraulic characterization of an unconfined aquifer by common mid-point measurements using GPR
Affiliation: Xiamen University, Department of Electronic Sciences, Xiamen, China
Pages: 259-268
Published: 201412
Text Language: English
Publisher: Environmental and Engineering Geophysical Society, Englewood, CO, United States
References: 37
Accession Number: 2015-007733
Categories: HydrogeologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Tongji University, CHN, ChinaGuangzhou University, CHN, ChinaTohoku University, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201504
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