Reducing ambiguities in vertical electrical sounding interpretations: A geostatistical application

Kumar, Dewashish; Ahmed, Shakeel; Krishnamurthy, N.; Dewandel, Benoı̂t

doi:10.1016/j.jappgeo.2006.07.001

Cited by 58 publications

(22 citation statements)

References 37 publications

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“…They control the hydrodynamic properties of an aquifer as well as the transport of solutes and the dispersal of contaminants. Several methods can help determining the variability of permeability, or imaging the structure of the main flow zones in an aquifer around boreholes; these include geophysical and imaging logs, fluid logs-particularly temperature, conductivity and flow logs-as well as packer tests (Keys, 1990; Barton et al, 1995;Paillet and Pedler, 1996;Berkowitz, 2002;Schurch and Buckley, 2002;Maréchal et al, 2004;Kumar et al, 2007;Le Borgne et al, 2007;Chatelier et al, 2011;Dewandel et al, 2012). Whatever the geological context, the use of hydrochemical logging is less common, but has proved relevant for characterizing a heterogeneous aquifer (Schurch and Buckley, 2002;Schurch and Vuataz, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…This watershed underlain by granite, is representative of the overexploited crystalline aquifers in India (Maréchal et al, 2004Dewandel et al, 2006, Kumar et al, 2007, where links between overpumping and groundwater degradation (Perrin et al, 2011;Purushotham et al, 2011), and the appearance of dental fluorosis among children have been established. The objective was to use hydrochemical logs for improving our understanding of the anthropogenic and natural factors driving the accumulation and spatial variability of fluoride in groundwater, which required demonstrating beforehand the reliability of in-situ fluoride measurements.…”

Section: Introductionmentioning

confidence: 99%

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Hydrochemical borehole logs characterizing fluoride contamination in a crystalline aquifer (Maheshwaram, India)

Pauwels

Négrel

Dewandel³

et al. 2015

Journal of Hydrology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrochemical borehole logs characterizing fluoride contamination in a crystalline aquifer (Maheshwaram, India)

Pauwels

Négrel

Dewandel³

et al. 2015

Journal of Hydrology

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“…(Kumar et al, 2007;Yilmaz, 2011). The low values of coefficient of anisotropy (λ) falls unequivocally between-0.0352 to 0.6.…”

Section: D Contour Map Of Anisotropymentioning

confidence: 99%

Determination of Ground water potential by electric resistivity method in Rawalakot and adjoining areas of the Sub Himalayan fold and thrust Belt of Pakistan

Ijaz¹,

Yasin²

2017

Pak. j. geol.

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The study area lies in the Sub-Himalayan fold and thrust belt of Northeastern Pakistan. The electrical resistivity soundings (Schlumberger array) in 24 locations were deployed using ABEM Terameter SAS 4000 (Sweden) with all paraphernalia in the order to explore ground water at considerable depth within formations. The 2D contour maps of apparent resistivity at 30 m, 60 m and 90 m spacings, transverse resistance and anisotropic contour maps, 2D and 3D maps of aquifer thickness and longitudinal conductance were compiled. The earth resistivity model was formulated by means of IPI2win software. The qualitative and quantitative interpretation indicates that the investigated area includes confined or semi confined type aquifers beneath sedimentary cover.

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“…Geostatistics assumes that a regionalized variable at location u, Z(u), is a random function with only one realization (Moukana and Koike 2008), and comprises a set of techniques and estimators. Geostatistical technique and approaches, based on the theory of regionalized variables and the spatial auto-correlation of the target variable, have found to be useful in dealing with the variable/parameter defining the earth system (Kumar et al 2007). The first and foremost step in the geostatistical analysis is the semivariogram analysis.…”

Section: Geostatistical Approachmentioning

confidence: 99%

Validating the demarcation of eco-geographical regions: a geostatistical application

Gao

Zhao

2009

Environ Earth Sci

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Eco-geographical regional system is important for the study of global environmental changes and sustainable development, and it serves as a scientific basis for rationally managing and sustainably utilizing ecosystems and natural resources, such as constructing healthy eco-environments and making policies of environmental management. This paper explained the necessity of validation in the demarcation of eco-geographical regions, which is difficult and may be achieved with some assumptions and presumptions because of the existence of transition zones. Also in this paper, we explored the use of geostatistics in validating regions and boundaries using a case study in Qinghai-Tibet Plateau on the basis of normalized difference vegetation index (NDVI) data. The results show that: (1) eco-geographical regions have different spatial complexity and spatial heterogeneity [i.e. different characteristic values (nugget/sill, fractal) of NDVI], and regions with similar patterns of temperature and moisture have similar mean NDVI values and spatial characteristics [i.e. similar spatial characteristic values (nugget/sill, fractal) of NDVI]. Thus, based on the similarity of spatial heterogeneity or spatial patterns of distribution, demarcations of eco-geographical regions with similar conditions of temperature and moisture, such as IID1 (Ngari montane desert-steppe and desert zone), IID2 (Qaidam montane desert zone), and IID3 (Northern slopes of Kunlun montane desert zone), meet the regional validation requirement. (2) Based on the comparison of spatial heterogeneity or spatial patterns of distribution, the boundary between IIA/B1 (Western Sichuan-eastern Xizang montane coniferous forest zone) and IB1 (GologNagqu high-cold shrub-meadow zone) meets the boundary validation requirement. This boundary guarantees high similarities in an intra-region and high differences in inter-regions, because the value of fractal dimension is the minimum in buffer 1. Furthermore, this paper discussed the application of geostatistics in the choice of index system for boundaries of eco-geographical regions and the determination of region size. The results indicate that the application of geostatistics in eco-geographical regional system is broad, and such researches can serve for obtaining more reasonable and applicable eco-geographical regionalization schemes.

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Reducing ambiguities in vertical electrical sounding interpretations: A geostatistical application

Cited by 58 publications

References 37 publications

Hydrochemical borehole logs characterizing fluoride contamination in a crystalline aquifer (Maheshwaram, India)

Hydrochemical borehole logs characterizing fluoride contamination in a crystalline aquifer (Maheshwaram, India)

Determination of Ground water potential by electric resistivity method in Rawalakot and adjoining areas of the Sub Himalayan fold and thrust Belt of Pakistan

Validating the demarcation of eco-geographical regions: a geostatistical application

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