Geostatistical estimation of the transmissivity in a highly fractured metamorphic and crystalline aquifer (Man-Danane Region, Western Ivory Coast)

Razack, Moumtaz; Lasm, Théophile

doi:10.1016/j.jhydrol.2005.10.014

Cited by 63 publications

(60 citation statements)

References 21 publications

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“…, span two orders of magnitude, and reflect the heterogeneity of these aquifers. This finding is in agreement with the works performed in basement of Côte d'Ivoire and West Africa (Faillat and Leblond, 1982;Faillat, 1986 a and b;Biémi, 1992;Lasm, 2000;Jourda, 2005;Lasm et al, 2004;Razack and Lasm, 2006). The summary statistics is given in table 1 and the frequency distribution of raw transmissivity (logT) is illustrated on figure 3.…”

Section: Study Areasupporting

confidence: 88%

“…Transmissivity values were determined from the interpretation of pumping tests data using the recovery test data and Theis recovery method (Theis, 1935) in order to eliminate the effect of turbulent head losses in the borehole and gravel pack (Razack and Lasm, 2006;Lasm et al, 2008). Drawdowns were measured directly in pumping well.…”

Section: Study Areamentioning

confidence: 99%

“…Obtaining reliable hydrological input parameters is one of the key challenges in groundwater modelling applications. Transmissivity is a major hydraulic parameter of aquifers and is evaluated using pumping tests (Mace et al, 1999;Razack and Lasm, 2006;Gupta, 1989;Kawecki, 1993, Helweg, 1994. However, available pumping tests are often few, which does not allow analysing and assessing the distribution of this important parameter on large areas using classical methods.…”

Section: Introductionmentioning

confidence: 99%

“…The use of geostatistical techniques allow the estimation of this parameter on the entire study domain with a better accuracy (Razack and Lasm, 2006;Lasm et al, 2008;Baka et al, 2011). During the last decades, several studies De Marsily, 1987, 1993;Fabbri, 1997;De Marsily et al, 1999;Razack and Lasm, 2006;Lasm et al, 2008) have been carried out in geostatistical analysis of aquifers hydraulic parameters such as transmissivity and permeability. The different findings have shown that the geostatistical approach can lead to a reliable estimation of the transmissivity.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately these studies are limited to statistical description. There are very few works (Lasm, 2000;Razack and Lasm, 2006;Lasm et al, 2008;Lasm et al, 2009) concerning geostatistical estimation of fractured crystalline and metamorphic aquifers parameters. Techniques to estimate transmissivity data have been successfully applied in many aquifers in Côte d'Ivoire by Lasm (2000), Razack and Lasm (2006) and Lasm et al (2008) and elsewhere to provide valuable information for inputting in numerical models and for evaluating water resources.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of aquifer transmissivity assessment in crystalline and metamorphic fractured rocks in Bondoukou area, North-Eastern Côte d’Ivoire

Lasm¹,

Youan²

2012

AJSIR`

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This study is performed in the Bondoukou area located in north-eastern Côte d'Ivoire. The aim of this study was to improve the assessment of transmissivity of the highly fractured aquifers of Bondoukou area using kriging techniques. A previous estimation of the transmissivity was conducted with aquifer transmissivity of crystalline rocks (n = 62). These transmissivities were later supplemented by 78 samples of aquifer transmissivity of metamorphic rocks. The results of this study were compared with those obtained in crystalline rock aquifers. In both cases, the variogram exhibits a large nugget effect representing respectively 63 and 70% of total dispersion. The nugget effect of this study is less important than the previous study. The range is equal to 12 km and is larger than that obtained in the previous study. The structuring of the variogram is enhanced when we consider the aquifer transmissivity of metamorphic rocks. Transmissivity estimated in both studies varies between 4.00E-06 and 1.72 E-06 E-05 m 2 .s -1 and between 3.86 E-06 and 1.84 E-05 m 2 .s -1 respectively in the previous study and in this study. In both cases, the observed and estimated transmissivities values are comparable and are spread over two orders of magnitude. Kriging maps showed that the estimation of transmissivity in Bondoukou area is better in this study. The results obtained in this study are interesting because they showed improved estimate of the transmisssivity in the Bondoukou area.

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Section: Study Areasupporting

confidence: 88%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of aquifer transmissivity assessment in crystalline and metamorphic fractured rocks in Bondoukou area, North-Eastern Côte d’Ivoire

Lasm¹,

Youan²

2012

AJSIR`

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A methodology for regionalizing 3‐D effective porosity at watershed scale in crystalline aquifers

Dewandel¹,

Caballero²,

Perrin

et al. 2017

Hydrological Processes

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International audience13 An innovative approach for regionalizing the 3-D effective-porosity field is presented and 14 applied to two large, overexploited and deeply weathered crystalline aquifers located in 15 southern India. The method derives from earlier work on regionalizing a 2-D effective-16 porosity field in that part of an aquifer where the water table fluctuates, which is now 17 extended over the entire aquifer using a 3-D approach. A method based on geological and 18 geophysical surveys has also been developed for mapping the weathering profile layers 19 (saprolite and fractured layers). The method for regionalizing 3-D effective porosity 20 combines: water-table fluctuation and groundwater budget techniques at various cell sizes 21 with the use of satellite based data (for groundwater abstraction), the structure of the 22 weathering profile and geostatistical techniques. The approach is presented in detail for the 23 Kudaliar watershed (983 km 2), and tested on the 730 km 2 Anantapur watershed. At watershed 24 scale, the effective porosity of the aquifer ranges from 0.5% to 2% in Kudaliar and between 25 0.3% and 1% in Anantapur, which agrees with earlier works. Results show that: i) depending 26 on the geology and on the structure of the weathering profile, the vertical distribution of 27 effective porosity can be very different, and that the fractured layers in crystalline aquifers are 28 not necessarily characterized by a rapid decrease in effective porosity; and ii) that the lateral 29 variations in effective porosity can be larger than the vertical ones. These variations suggest 30 that within a same weathering profile the density of open fractures and/or degree of 31 weathering in the fractured zone may significantly varies from a place to another. 32 The proposed method provides information on the spatial distribution of effective porosity 33 which is of prime interest in terms of flux and contaminant transport in crystalline aquifers. 34 Implications for mapping groundwater storage and scarcity are also discussed, which should 35 help in improving groundwater resource management strategies. 36 3

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Hydrological Processes

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2006. Hydroclimatological influences on water column and streambed thermal dynamics in an alpine river system. Journal of Hydrology 325: 1-20. Cooper D, Sanderson J, Stannard D, Groeneveld D. 2006. Effects of long-term water table drawdown on evapotranspiration and vegetation in an arid region phreatophyte community. Journal of Hydrology 325: 21-34. Enfield D, Cid-Serrano L. 2006. Projecting the risk of future climate shifts. International Journal of Climatology 26: 885-895. Laakso L, Koponen I, Monkkonen P, Kulmala M, Kerminen V, Wehner B, Wiedensohler A, Wu Z, Hu M. 2006. Aerosol particles in the developing world; A comparison between New Delhi in India and Beijing in China. Water Air and Soil Pollution 173: 5-20.

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Geostatistical estimation of the transmissivity in a highly fractured metamorphic and crystalline aquifer (Man-Danane Region, Western Ivory Coast)

Cited by 63 publications

References 21 publications

Improvement of aquifer transmissivity assessment in crystalline and metamorphic fractured rocks in Bondoukou area, North-Eastern Côte d’Ivoire

Improvement of aquifer transmissivity assessment in crystalline and metamorphic fractured rocks in Bondoukou area, North-Eastern Côte d’Ivoire

A methodology for regionalizing 3‐D effective porosity at watershed scale in crystalline aquifers

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