Hydraulic Conductivities of Low Permeability Sediments Inferred from a Triple Pumping Test and Observed Vertical Gradients
Identifieur interne : 000677 ( Istex/Curation ); précédent : 000676; suivant : 000678Hydraulic Conductivities of Low Permeability Sediments Inferred from a Triple Pumping Test and Observed Vertical Gradients
Auteurs : Luc Lebbe [Belgique] ; Nathalie Van Meir [Belgique]Source :
- Groundwater [ 0017-467X ] ; 2000-01.
Abstract
Knowing vertical conductivities of thick aquitards is important for simulating regional or local ground water flow. These hydraulic parameters are best determined by calibration of these models. Collection of reliable data from heavily pumped ground water reservoirs can be problematic. Another way to infer these hydraulic parameters is the simultaneous interpretation of different parts of a multiple pumping test using an inverse numerical model. Here, the drawdowns observed in the indirectly pumped aquifers allow us to deduce the vertical conductivities of the aquitards with an equivalent accuracy as the horizontal conductivities of the aquifers. When the hydraulic resistances of the aquitards are too large, it becomes impossible to induce observable drawdowns in the indirectly pumped aquifers, and the inverse model loses valuable input data. Observing vertical gradients in and over the aquitards in case of important vertical flow can make up for this loss. These data allow us to estimate the specific discharges through the successive parts of the aquitard and hence their hydraulic resistances. This useful information allows us to consider all these hydraulic resistances in one group of hydraulic parameters during the simultaneous interpretation of the multiple pumping test using an inverse numerical model. As this procedure reduces the number of identified parameter groups, it enhances their reliability. In this paper it is demonstrated how this reliability can be deduced from a number of statistical parameters that can also be used in the collinear diagnosis. The proposed interpretation procedure is demonstrated on a triple pumping test performed in and around the most important aquitard in Flanders, Belgium. The obtained results should first be integrated in a local ground water flow model. By the performance of a number of such integrated hydrogeological studies, the lateral change in the hydraulic properties of this aquitard can be evaluated.
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DOI: 10.1111/j.1745-6584.2000.tb00204.x
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Hydraulic Conductivities of Low Permeability Sediments Inferred from a Triple Pumping Test and Observed Vertical Gradients</title><author><name sortKey="Lebbe, Luc" sort="Lebbe, Luc" uniqKey="Lebbe L" first="Luc" last="Lebbe">Luc Lebbe</name><affiliation><mods:affiliation>Fund of Scientific Research‐Flanders. E‐mail: luc.lebbe@rug.ac.be (first author).</mods:affiliation><wicri:noCountry code="no comma">Fund of Scientific Research‐Flanders. E‐mail: luc.lebbe@rug.ac.be (first author).</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent, Belgium.</mods:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent</wicri:regionArea></affiliation></author><author><name sortKey="Van Meir, Nathalie" sort="Van Meir, Nathalie" uniqKey="Van Meir N" first="Nathalie" last="Van Meir">Nathalie Van Meir</name><affiliation><mods:affiliation>Flemish Institute for Promotion of Scientific Technological Research in Industry.</mods:affiliation><wicri:noCountry code="no comma">Flemish Institute for Promotion of Scientific Technological Research in Industry.</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent, Belgium.</mods:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:D10882F574544F0E535311224FED6BA0BE37BE78</idno><date when="2000" year="2000">2000</date><idno type="doi">10.1111/j.1745-6584.2000.tb00204.x</idno><idno type="url">https://api.istex.fr/ark:/67375/WNG-Z3D679C0-R/fulltext.pdf</idno><idno type="wicri:Area/Istex/Corpus">000697</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000697</idno><idno type="wicri:Area/Istex/Curation">000677</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main">Hydraulic Conductivities of Low Permeability Sediments Inferred from a Triple Pumping Test and Observed Vertical Gradients</title><author><name sortKey="Lebbe, Luc" sort="Lebbe, Luc" uniqKey="Lebbe L" first="Luc" last="Lebbe">Luc Lebbe</name><affiliation><mods:affiliation>Fund of Scientific Research‐Flanders. E‐mail: luc.lebbe@rug.ac.be (first author).</mods:affiliation></affiliation><affiliation wicri:level="1"><mods:affiliation>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent, Belgium.</mods:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent</wicri:regionArea></affiliation></author><author><name sortKey="Van Meir, Nathalie" sort="Van Meir, Nathalie" uniqKey="Van Meir N" first="Nathalie" last="Van Meir">Nathalie Van Meir</name><affiliation><mods:affiliation>Flemish Institute for Promotion of Scientific Technological Research in Industry.</mods:affiliation></affiliation><affiliation wicri:level="1"><mods:affiliation>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent, Belgium.</mods:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Now at the Laboratory of Applied Geology and Hydrogeology, University of Gent, Krijgslaan 281 (S8), B‐9000 Gent</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Groundwater</title><idno type="ISSN">0017-467X</idno><idno type="eISSN">1745-6584</idno><imprint><biblScope unit="vol">38</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="76">76</biblScope><biblScope unit="page" to="88">88</biblScope><biblScope unit="page-count">13</biblScope><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2000-01">2000-01</date></imprint><idno type="ISSN">0017-467X</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0017-467X</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Knowing vertical conductivities of thick aquitards is important for simulating regional or local ground water flow. These hydraulic parameters are best determined by calibration of these models. Collection of reliable data from heavily pumped ground water reservoirs can be problematic. Another way to infer these hydraulic parameters is the simultaneous interpretation of different parts of a multiple pumping test using an inverse numerical model. Here, the drawdowns observed in the indirectly pumped aquifers allow us to deduce the vertical conductivities of the aquitards with an equivalent accuracy as the horizontal conductivities of the aquifers. When the hydraulic resistances of the aquitards are too large, it becomes impossible to induce observable drawdowns in the indirectly pumped aquifers, and the inverse model loses valuable input data. Observing vertical gradients in and over the aquitards in case of important vertical flow can make up for this loss. These data allow us to estimate the specific discharges through the successive parts of the aquitard and hence their hydraulic resistances. This useful information allows us to consider all these hydraulic resistances in one group of hydraulic parameters during the simultaneous interpretation of the multiple pumping test using an inverse numerical model. As this procedure reduces the number of identified parameter groups, it enhances their reliability. In this paper it is demonstrated how this reliability can be deduced from a number of statistical parameters that can also be used in the collinear diagnosis. The proposed interpretation procedure is demonstrated on a triple pumping test performed in and around the most important aquitard in Flanders, Belgium. The obtained results should first be integrated in a local ground water flow model. By the performance of a number of such integrated hydrogeological studies, the lateral change in the hydraulic properties of this aquitard can be evaluated.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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