Processus hydrogéochimiques et séparation d’hydrogrammes de crue sur un bassin versant en milieu soudano-tropical de socle au Bénin (Donga, haute vallée de l’Ouémé)

Kamagaté, Bamory; Séguis, Luc; Lanciné, Gone Droh; Favreau, Guillaume; Koffi, Kouadio

doi:10.7202/018782ar

Cited by 2 publications

(4 citation statements)

References 17 publications

(7 reference statements)

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“…, 1990; Key, 1992; Wright, 1992; Faillat et al. , 1999; Lasm and Razack, 2001; Razack and Lasm, 2006; Neves and Morales, 2007; Bamory et al. , 2008; Batte et al.…”

Section: Discussion Of Some ‘Established’ Concepts In Hr Hydrogeologymentioning

confidence: 99%

“…Several other authors have described and ⁄ or characterized the assumed structure of HRA and stated that their fracturing is of tectonic origin (see for instance Guiraud et al, 1990;Key, 1992;Wright, 1992;Faillat et al, 1999;Lasm and Razack, 2001;Razack and Lasm, 2006;Neves and Morales, 2007;Bamory et al, 2008;Batte et al, 2008;Kouame´et al, 2010). And yet they did not demonstrate that hypothesis.…”

Section: Genetics Of the Fissured Layer By Tectonic Fracturingmentioning

confidence: 99%

“…Most of the cited examples are taken from the French ÔMassif ArmoricainÕ (French Brittany), a HR area presently considered as almost inactive (Moreau et al, 2006) (from a tectonic standpoint it is often considered as a median between TAA and really stable areas) but comprising, like most HR areas in the world, several thousands of water wells (Mougin et al, 2005). Razack and Lasm, 2006;Bamory et al, 2008;Kouame´et al, 2010). However, faults are complex geological objects, with various facies (Caine et al, 1996) and thus exhibit a wide range of hydraulic conductivities from permeable to highly impermeable.…”

Section: Tectonic Fracturing Of Hr Outside Taamentioning

confidence: 99%

“…Tectonic fracturing does not systematically create permeable structures. Tectonic faults/fractures are often considered only as permeable structures (see for instance Razack and Lasm, 2006; Bamory et al. , 2008; Kouamé et al.…”

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confidence: 99%

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The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

Lachassagne

Wyns

Dewandel³

2011

Terra Nova

205

154

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Terra Nova, 23, 145–161, 2011 Abstract The hydrogeology of superficial (∼0–100 m b.g.l.) Hard Rock Aquifers (HRA; i.e. plutonic and metamorphic rocks) has so far been dominated by a few concepts considered to be relevant by a large majority of the HRA community. One of the most fundamental of these concepts is that their (secondary, fissure/fracture) permeability is either of tectonic origin or related to unloading processes. We will show that these genetic concepts are erroneous. We will demonstrate how the hydraulic conductivity of HRAs is a consequence of the (palaeo) weathering processes, with a stratiform fissured layer located immediately below the unconsolidated saprolite and, to a lesser extent, a verticalized fissured layer at the periphery of (or within) pre‐existing discontinuities (veins, joints, ancient faults, lithological contacts, etc.). This result opens up large perspectives in terms of applied hydrogeology and applied geology. A specifically dedicated methodological toolkit well adapted to the operational survey, management and protection of HRAs is briefly presented.

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“…, 1990; Key, 1992; Wright, 1992; Faillat et al. , 1999; Lasm and Razack, 2001; Razack and Lasm, 2006; Neves and Morales, 2007; Bamory et al. , 2008; Batte et al.…”

Section: Discussion Of Some ‘Established’ Concepts In Hr Hydrogeologymentioning

confidence: 99%