Time-dependent magnetometric resistivity anomalies of groundwater contamination: Synthetic results from computational hydro-geophysical modeling

Yang, Jianwen

doi:10.1007/s11770-008-0041-3

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…It is equally critical in environmental issues as groundwater flow controls the behavior of contaminant transport via advection and hydrodynamic dispersion [2]. A variety of mechanisms have been deemed responsible for groundwater flow [3], among which topography and buoyancy are the two driving forces commonly encountered in reality, particularly in large-scale groundwater systems.…”

mentioning

confidence: 99%

Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow

Yang

Feng

et al. 2010

Sci. China Ser. D-Earth Sci.

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Both topography and buoyancy can drive groundwater flow; however, the interactions between them are still poorly understood. In this paper, the authors conduct numerical simulations of variable-density fluid flow and heat transport to quantify their relative importance. The finite element modeling experiments on a 2-D conceptual model reveal that the pattern of groundwater flow depends largely upon the relative magnitude of the flow rate due to topography alone and the flow rate due to buoyancy alone. When fluid velocity due to topography is greater than that due to buoyancy at large water table gradients, topography-driven 'forced convection' overwhelms buoyancy-driven 'free convection'. When flow velocity due to buoyancy is greater than that due to topography at small water table gradients, mixed free and forced convection takes place. In this case, free convection becomes dominant, but topography-driven flow still plays an important role since it pushes the free convection cells to migrate laterally in the downhill direction. Consequently, hydrothermal fluid flow remains changing periodically with time and no steady state can be reached. The presence of a low-permeability layer near the surface helps eliminate the topography effect on the underlying free convection. hydrothermal flow, free convection, forced convection, topography, buoyancy, finite element modeling Citation:Yang J W, Feng Z H, Luo X R, et al. Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow. Sci

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mentioning

confidence: 99%

Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow

Yang

Feng

et al. 2010

Sci. China Ser. D-Earth Sci.

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“…The anions and cations present in leachate make it electrically more conductive than the surrounding rock and soil, thus enabling geo-electrical methods ideal for mapping the extent of leachate distribution (Loke, 1999;Radulescu, Valerian, & Yang, 2007;Zhu & Yang, 2008).…”

Section: Geophysical Surveysmentioning

confidence: 99%

“…However, boreholes only provide a very limited and point-source typed information, disregarding the areal extent of the contamination at the sites (Zume et al, 2006). Non-invasive geophysical methods, especially geo-electrical methods, have proven their credibility in landfill-related studies, and become standard tools over the past decades in the determination of internal landfill structure, leachate levels and cap material thickness (e.g., Loke, 1999;Osiensky, 1999;Bernstone et al, 2000;Radulescu, Valerian, & Yang, 2007;Zhu & Yang, 2008;Joshi, 2013).…”

Section: Introductionmentioning

confidence: 99%

Hydro-Geophysical Investigation of Contaminant Distribution at a Closed Landfill in Southwestern Ontario, Canada

Yang¹,

Joshi²

2014

GEP

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This paper presents a hydro-geophysical investigation into the landfill leachate distribution and subsurface geology at a closed site in southwestern Ontario, Canada, using geophysical mapping and hydrological modeling approaches. Conductivity mapping was first conducted over the study site using a frequency-domain EM terrain conductivity meter, revealing an anomalous high-conductivity zone of about 200 m (S-N) × 80 m (W-E) at the western half of the site. The DC resistivity survey was then carried out at this anomalous zone with eight S-N profiles and three W-E profiles measuring 200m in length using a Wenner-α configuration. Our resistivity survey results indicate that the landfill leachate travels mainly south-east wards over the upper aquifer, with a minor vertical component into the upper weathered portion of the silt/sand aquitard at some locations. No contamination seems to exist in the lower sand aquifer. The geophysical results were later used to develop two conceptualized models for hydrological modeling. Our numerical results predict the leachate distribution at the study site in the future, confirming that the contaminant will occupy the entire upper aquifer and the most of the aquitard in a time of 1000 years, and that the barrier of the aquitard will protect the lower sand aquifer from the leachate pollution. These findings are critical in evaluating the current leachate conditions and the existing compliance monitoring plan for potential implementation at this study site and other sites in elsewhere.

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“…(如矿床成矿、油气运移、板块构造、地热传导、成岩及变质作用等) [1] . 它在环境方面也有同样的重要性, 因为地下水可以控制污染物质在水圈的迁移 [2] . 影响地下水流动的机制有多种 [3] , 其中, 地形起伏和浮力这两种驱动因素在现实中较常遇到, 特别在大尺度的地下水流动系统中.…”

Section: 地下水流在很多地质过程中都起着重要的作用unclassified

数值模拟定量探索地形起伏及浮力在驱动地下水流中的相对重要性

罗¹,

冯²,

杨³

et al. 2010

Sci. Sin.-Terrae

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Time-dependent magnetometric resistivity anomalies of groundwater contamination: Synthetic results from computational hydro-geophysical modeling

Cited by 10 publications

References 21 publications

Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow

Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow

Hydro-Geophysical Investigation of Contaminant Distribution at a Closed Landfill in Southwestern Ontario, Canada

数值模拟定量探索地形起伏及浮力在驱动地下水流中的相对重要性

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