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  • 1
    Electronic Resource
    Electronic Resource
    Zirconocene derivatives with phosphinomethanide ligands: metal-promoted ligand metalations: tuning of regioselectivity and formation of novel zirconaphosphaheterocycles (1993)
    s.l. : American Chemical Society
    Organometallics 12 (1993), S. 2757-2766 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00031a051
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Recovery Analysis from Pumping Tests with Stepped Discharge (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 31 (1993), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Recovery analysis from pumping tests with varying discharge is well-documented but in practice often wrongly considered to be impractical or even impossible. However, the Theis recovery method for constant rate tests is popular and widely used to determine aquifer transmissivity. The purpose of this paper is to review and promote determination of transmissivity by recovery analysis in tests in which the discharge is not steady but represented by a step function. The equations for a stepped discharge recovery method are presented in a simple form, highlighting the fact that it is a direct extension of the Theis recovery method with the same advantages and ease of application. It is demonstrated that the Theis recovery method cannot generally be used with an average discharge for varying rate tests. Recovery analysis should always be approached with the stepped discharge recovery method, which reduces to the Theis method if the discharge is constant. The stepped discharge recovery method is particularly useful for step tests and for analyzing data from the pumped well, and it should be standard practice to monitor the recovery in all pumping tests on single wells. It is also shown that a different storage coefficient during recovery than during pumping does not result in a shifted straight line in the recovery analysis but in a curve passing through the origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1993.tb00591.x
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  • 3
    Electronic Resource
    Electronic Resource
    Meaningful Interpretation of Step-Drawdown Tests (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 33 (1995), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: From a critical review of literature it is concluded that the available methods of analyzing step-drawdown tests produce information which can be misleading, inaccurate, or meaningless. Calculation of the total well loss from step-drawdown tests, on the other hand, provides a meaningful evaluation of well performance but is not explicitly described in literature. Therefore, a method is presented for determining the total well loss as a function of discharge with linear and nonlinear components. The method is restricted to confined aquifers, but an observation well is not required because any reasonable estimate of the storage coefficient is usually adequate. An advantage of the method is that it is valid for any stepped pumping pattern and any observed fluctuations in discharge during a step are simply accommodated as additional steps. Field examples show that the method can be very successful and useful. Other specific conclusions are that well efficiency should not be calculated because it is misleading, and that aquifer transmissivity should be determined in step-drawdown tests from recovery data in the pumped well, not pumping data, to improve accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1995.tb00259.x
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  • 4
    Electronic Resource
    Electronic Resource
    Unconfined Linear Flow to a Horizontal Well (2005)
    Oxford, UK; Malden, USA : Blackwell Science Inc
    Ground water 43 (2005), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The validity of a previously proposed but untested modification to equations for flow to a horizontal well is assessed using a specially developed finite-difference model. This modification extends confined flow equations to allow the head in the well and the saturated depth at the well to be estimated in unconfined conditions. The study is limited to the case of two-dimensional flow with no flow in the direction parallel to the line of the well. The results show that the modified equations for both a finite unconfined aquifer and, by inference, an infinite unconfined aquifer are adequately accurate for practical application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.2005.0059.x
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of Continuous and Cyclic Pumping from a Well (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 39 (2001), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Two practically applicable pumping patterns for wells are: (1) continuous pumping at a sustainable constant rate; and (2) pumping at a sustainable constant rate for a fixed period every day (cyclic pumping). Theoretical analysis shows that with the cyclic pumping pattern the pump can be run at a higher rate than with continuous pumping. However continuous pumping at the maximum continuously sustainable constant rate produces considerably more water. If the objective is to produce as much water as possible, it is important to use a pump designed for running at the maximum continuously sustainable rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.2001.tb02351.x
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  • 6
    Electronic Resource
    Electronic Resource
    DISCUSSION (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 35 (1997), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1997.tb00117.x
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  • 7
    Electronic Resource
    Electronic Resource
    Correction for Temperature Effect in the Recovery of a Pumped Well (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 33 (1995), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Water levels measured in tests on pumped or flowing wells tapping confined aquifers are generally affected by temperature changes in the water column. This temperature effect becomes significant in deep wells, making direct hydraulic analysis of test data meaningless. The problem can be avoided by using an observation well or by monitoring bottom-hole pressure in the test well, but both these options are costly and consequently not always available. Therefore, a temperature correction method is proposed based on a simple model assumed to describe the cooling in the test well during recovery. The method is designed to determine the aquifer transmissivity from recovery data and to calculate the true drawdown during pumping. The only additional test data requirements are measurements of the initial and stabilized discharge temperatures. Despite several approximating assumptions in the cooling model, the method has given apparently successful results in a number of case studies. Although further testing of its effectiveness is still required, the method may prove to be a useful secondary alternative in many cases if observation wells and bottom-hole pressure monitoring facilities are not available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1995.tb00037.x
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  • 8
    Electronic Resource
    Electronic Resource
    Groundwater Model of Conditions in Liverpool Sandstone Aquifer (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 2 (1988), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: This study considers the groundwater conditions for the period 1948–82 in the Permo-Triassic Sandstone aquifer of the Liverpool area. During this period, significant changes have occurred in the abstraction patterns and a new railway tunnel has been constructed below sea level in Central Liverpool. To understand the flow conditions within the aquifer, detailed studies have been carried out into the aquifer properties, the influence of rivers and tunnels, and the estimation of recharge. It is found that conventional rainfall recharge accounts for only one-third of the total recharge.Numerical model solutions were used to check the adequacy of the understanding of the flow processes and the solutions have confirmed that the rising water levels in Central Liverpool result from high recharge and a reduction in abstraction. Having validated the model by comparisons with field data, the model was then used to predict the probable future water level changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1988.tb01250.x
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  • 9
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    Zirconocene derivatives with phosphinomethanide ligands: metal-promoted ligand metalations: tuning of regioselectivity and formation of novel zirconaphosphaheterocycles (1993)
    American Chemical Society
    Details
    Publication Date: 1993-07-01
    Print ISSN: 0276-7333
    Electronic ISSN: 1520-6041
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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  • 10
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    A Model to Simulate Pumping Tests in Wells with High Loss and Backflow (2010)
    Wiley
    Details
    Publication Date: 2010-08-31
    Print ISSN: 0017-467X
    Electronic ISSN: 1745-6584
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Published by Wiley
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