Analysis of groundwater pollution caused by mine leachate leakage considering natural impermeable layer

The purpose of the paper is to apply two methods to groundwater pollution in porous media. The methods are the weighted finite difference method and the boundary element method, which were proposed or developed by Kanoh et al. (1986,1988) for advective diffusion problems. Numerical modeling of groundwater pollution is also investigated in this paper. By subdividing the domain into subdomains, the nonlinearity is localized to a small region. Computational time for groundwater pollution problems can be saved by the boundary element method; accurate numerical results can be obtained by the weighted finite difference method. The computational solutions to the problem of seawater intrusion into coastal aquifers are compared with experimental results.

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Sand- and Clay-Photocured-Geomembrane Interface Shear Characteristics Using Direct Shear Test

Sustainability ◽

10.3390/su13158201 ◽

2021 ◽

Vol 13 (15) ◽

pp. 8201

Author(s):

Lihua Li ◽

Han Yan ◽

Henglin Xiao ◽

Wentao Li ◽

Zhangshuai Geng

Keyword(s):

Soil Surface ◽

Friction Angle ◽

Direct Shear ◽

Tensile Crack ◽

Shear Tests ◽

Interface Shear ◽

Direct Shear Tests ◽

Carbon Black Powder ◽

Shear Characteristics ◽

Impermeable Layer

It is well known that geomembranes frequently and easily fail at the seams, which has been a ubiquitous problem in various applications. To avoid the failure of geomembrane at the seams, photocuring was carried out with 1~5% photoinitiator and 2% carbon black powder. This geomembrane can be sprayed and cured on the soil surface. The obtained geomembrane was then used as a barrier, separator, or reinforcement. In this study, the direct shear tests were carried out with the aim to investigate the interfacial characteristics of photocured geomembrane–clay/sand. The results show that a 2% photoinitiator has a significant effect on the impermeable layer for the photocured geomembrane–clay interface. As for the photocured geomembrane–sand interface, it is reasonable to choose a geomembrane made from a 4% photoinitiator at the boundary of the drainage layer and the impermeable layer in the landfill. In the cover system, it is reasonable to choose a 5% photoinitiator geomembrane. Moreover, as for the interface between the photocurable geomembrane and clay/sand, the friction coefficient increases initially and decreases afterward with the increase of normal stress. Furthermore, the friction angle of the interface between photocurable geomembrane and sand is larger than that of the photocurable geomembrane–clay interface. In other words, the interface between photocurable geomembrane and sand has better shear and tensile crack resistance.

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Groundwater pollution in the region of Relizane, Algeria with focus on the physical–chemical and bacteriological characteristics

International Journal of Energy and Water Resources ◽

10.1007/s42108-021-00124-6 ◽

2021 ◽

Author(s):

R. Fares ◽

H. Naim ◽

A. Bouadi

Keyword(s):

Groundwater Pollution ◽

Physical Chemical

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Benefits of the induced polarization geoelectric method to hydrocarbon exploration

Geophysics ◽

10.1190/1.3076607 ◽

2009 ◽

Vol 74 (2) ◽

pp. B47-B59 ◽

Cited By ~ 42

Author(s):

Paul C. Veeken ◽

Peter J. Legeydo ◽

Yuri A. Davidenko ◽

Elena O. Kudryavceva ◽

Sergei A. Ivanov ◽

...

Keyword(s):

Processing Parameters ◽

Induced Polarization ◽

Hydrocarbon Exploration ◽

Petroleum Exploration ◽

Alteration Zone ◽

Impermeable Barrier ◽

Reasonable Cost ◽

Impermeable Layer ◽

Local Enrichment ◽

Target Depth

Delineation of hydrocarbon prospective areas is an important issue in petroleum exploration. The geoelectric method helps to identify attractive areas and reduces the overall drilling risk. For this purpose, induced polarization (IP) effects are mapped caused by the presence of epigenetic pyrite microcrystals in sedimentary rocks. These crystals occur in a shallow halo-shaped mineralogical alteration zone, often overlying a deeper-seated hydrocarbon accumulation. Local enrichment in pyrite results from reducing geochemical conditions below an impermeable layer. The imperfect top seal of the accumulation permits minor amounts of hydrocarbons to escape and migrate through the overlying rocks to shallower levels. During migration, hydro-carbons encounter an impermeable barrier, forming an altera-tion zone. Induced polarization logging and coring in wells confirm this working model. Geoelectric surveying visual-izes anomalies in electric potential difference measured be-tween receiver electrodes. The differentially normalized method (DNME) inverts the registered decay in potential differences, establishing a depth model constrained by seismic and petro-physical data. Diagnostic geoelectric attributes are proposed, giving a better grip on chargeability and resistivity distribution. Acquisition and processing parameters are adjusted to the target depth. Encouraging results are obtained in deeper [Formula: see text] as well as in very shallow water. Onshore, a grounded current transmitter is used. Geoelectric surveys cover different geologic settings with varying target depths. The success ratio for predicting hydrocarbon occurrences is high. So far, 40 successful wells have been drilled in Russia on mapped geoelectric anomalies. Out of 126 wells, the method produced satisfactory results in all but two cases. The technique reduces the risk attached to new hydrocarbon prospects and allows better ranking at a reasonable cost.

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The phreatic aquifer of the ?Plana de Castell�n? (Spain):relationships between animal assemblages and groundwater pollution

Hydrobiologia ◽

10.1007/bf00019288 ◽

1995 ◽

Vol 297 (3) ◽

pp. 241-249 ◽

Cited By ~ 13

Author(s):

J. Notenboom ◽

R. Serrano ◽

I. Morell ◽

F. Hern�ndez

Keyword(s):

Groundwater Pollution ◽

Phreatic Aquifer

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Comparison of Aminocyclopyrachlor to Common Herbicides for Kudzu (Pueraria montana) Management

Invasive Plant Science and Management ◽

10.1614/ipsm-d-11-00024.1 ◽

2011 ◽

Vol 4 (4) ◽

pp. 419-426 ◽

Cited By ~ 15

Author(s):

Patrick J. Minogue ◽

Stephen F. Enloe ◽

Anna Osiecka ◽

Dwight K. Lauer

Keyword(s):

Growth Rates ◽

Groundwater Pollution ◽

Fast Growth ◽

Control Measures ◽

Volume Index ◽

Metsulfuron Methyl ◽

Herbicide Treatment ◽

Herbicide Treatments ◽

Repeated Applications ◽

Pueraria Montana

AbstractKudzu is an invasive perennial climbing vine characterized by fast growth rates and tolerance to control measures. Repeated applications with high rates of 2,4-D plus picloram provide effective kudzu control, but picloram use is not permitted in certain states due to groundwater pollution concerns. Studies were conducted in Alabama and Florida to compare kudzu control with aminocyclopyrachlor, a new herbicide, to control provided by aminopyralid, clopyralid, metsulfuron methyl, and picloram plus 2,4-D, which are common treatments for kudzu management. Two annual applications of the same herbicide treatment were evaluated for effects on kudzu cover, kudzu volume index, and cover of other vegetation. Aminocyclopyrachlor at 140 to 280 g ae ha−1 (2 to 4 oz ae ac−1) was as effective as the standard 4.48 kg ae ha−1 (4 lb ae ac−1) 2,4-D amine plus 1.2 kg ae ha−1 picloram for kudzu control. There were no differences in kudzu control among the three rates of aminocyclopyrachlor tested. Colonization by graminoids, forbs, and Rubus spp. at 2 yr was greatest for herbicides providing the best kudzu control: aminocyclopyrachlor, and 2,4-D plus picloram. Herbicide treatments were more effective in controlling kudzu at the Alabama location, but repeated annual applications for 2 yr did not completely eliminate kudzu with any treatment at either site.

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