A Method for Evaluating Water-Level Response to Hydrolic Stress PDF Download
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Author: Edward R. German
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Author: Edward R. German
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
Author:
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ISBN:
Category :
Languages : en
Pages : 11
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Standard hydraulic test methods, such as constant-rate pumping tests, may be impractical for characterizing hazardous waste sites located near fluctuating hydrologic boundaries such as rivers or oceans. An alternate approach for hydrologic characterization at these locations is to analyze the groundwater responses associated with river-stage or tidal fluctuations to aquifer properties (i.e., hydraulic diffusivity). Based on this approach, aquifer properties were determined for an area adjoining the Columbia River on the Hanford Site using two sinusoidal analysis techniques described in Ferris (1952, 1963). The first method uses the observed groundwater time-lag response, the second uses the amplitude ratio of well water level to river stage. Both techniques assume the river fluctuations can be approximated by a sinusoidal pattern. A range for hydraulic conductivity was calculated based on the hydraulic diffusivity estimates obtained from the methods together with the known aquifer thickness (50 ft) and assumed specific yield (0.1). The analysis methods produced two overlapping hydraulic conductivity ranges, with the Ferris time-lag analysis method forming the upper bound of the range, and the Ferris well water-level/river-stage amplitude ratio method forming the lower bound. Results from a nearby standard constant-rate discharge aquifer test were also examined for comparison. These results were within the upper bound of the hydraulic conductivity range.
Author:
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Category :
Languages : en
Pages : 80
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The constant-rate discharge test is the principal field method used in hydrogeologic investigations for characterizing the hydraulic properties of aquifers. To implement this test, the aquifer is stressed by withdrawing ground water from a well, by using a downhole pump. Discharge during the withdrawal period is regulated and maintained at a constant rate. Water-level response within the well is monitored during the active pumping phase (i.e., drawdown) and during the subsequent recovery phase following termination of pumping. The analysis of drawdown and recovery response within the stress well (and any monitored, nearby observation wells) provides a means for estimating the hydraulic properties of the tested aquifer, as well as discerning formational and nonformational flow conditions (e.g., wellbore storage, wellbore damage, presence of boundaries, etc.). Standard analytical methods that are used for constant-rate pumping tests include both log-log type-curve matching and semi-log straight-line methods. This report presents a current state of the art'' review of selected transient analysis procedures for constant-rate discharge tests. Specific topics examined include: analytical methods for constant-rate discharge tests conducted within confined and unconfined aquifers; effects of various nonideal formation factors (e.g., anisotropy, hydrologic boundaries) and well construction conditions (e.g., partial penetration, wellbore storage) on constant-rate test response; and the use of pressure derivatives in diagnostic analysis for the identification of specific formation, well construction, and boundary conditions.
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Category :
Languages : en
Pages : 5
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A number of programs have been implemented on the Hanford Site that utilize the pumping and treatment of contaminated groundwater as part of their remediation strategy. Often the treated water is reinjected into the aquifer at injection well sites. The implementation of remedial pump and treat systems, however, results in hydraulic pressure responses, both areally and vertically (i.e., with depth) within the pumped aquifer. The area within the aquifer affected by the pump and treat system (i.e., radius of influence) is commonly estimated based on detecting associated water-level responses within surrounding monitor wells. Natural external stresses, such as barometric pressure fluctuations, however, can have a discernible impact on well water-level measurements. These temporal barometric effects may significantly mask water-level responses within more distant wells that are only slightly affected (
Author:
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Category :
Languages : en
Pages : 5
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Book Description
A number of programs have been implemented on the Hanford Site that utilize the pumping and treatment of contaminated groundwater as part of their remediation strategy. Often the treated water is reinjected into the aquifer at injection well sites. The implementation of remedial pump and treat systems, however, results in hydraulic pressure responses, both areally and vertically (i.e., with depth) within the pumped aquifer. The area within the aquifer affected by the pump and treat system (i.e., radius of influence) is commonly estimated based on detecting associated water-level responses within surrounding monitor wells. Natural external stresses, such as barometric pressure fluctuations, however, can have a discernible impact on well water-level measurements. These temporal barometric effects may significantly mask water-level responses within more distant wells that are only slightly affected (
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Category :
Languages : en
Pages :
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Robust performance evaluation represents one of the most challenging aspects of groundwater pump-and-treat (P & T) remedy implementation. In most cases, the primary goal of the P & T system is hydraulic containment, and ultimately recovery, of contaminants to protect downgradient receptors. Estimating the extent of hydraulic containment is particularly challenging under changing flow patterns due to variable pumping, boundaries and/or other conditions. We present a systematic approach to estimate hydraulic containment using multiple lines of evidence based on (a) water-level mapping and (b) groundwater modeling. Capture Frequency Maps (CFMs) are developed by particle tracking on water-level maps developed for each available water level data set using universal kriging. In a similar manner, Capture Efficiency Maps (CEMs) are developed by particle tracking on water-levels calculated using a transient groundwater flow model: tracking is undertaken independently for each stress period using a very low effective porosity, depicting the 'instantaneous' fate of each particle each stress period. Although conceptually similar, the two methods differ in their underlying assumptions and their limitations: their use together identifies areas where containment may be reliable (i.e., where the methods are in agreement) and where containment is uncertain (typically, where the methods disagree). A field-scale example is presented to illustrate these concepts.
Author:
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ISBN:
Category : Water-supply
Languages : en
Pages : 524
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Author: Geoff Beale
Publisher: CSIRO PUBLISHING
ISBN: 064310836X
Category : Nature
Languages : en
Pages : 615
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Book Description
Guidelines for Evaluating Water in Pit Slope Stability is a comprehensive account of the hydrogeological procedures that should be followed when performing open pit slope stability design studies. Created as an outcome of the Large Open Pit (LOP) project, an international research and technology transfer project on the stability of rock slopes in open pit mines, this book expands on the hydrogeological model chapter in the LOP project's previous book Guidelines for Open Pit Slope Design (Read & Stacey, 2009; CSIRO PUBLISHING). The book comprises six sections which outline the latest technology and best practice procedures for hydrogeological investigations. The sections cover: the framework used to assess the effect of water in slope stability; how water pressures are measured and tested in the field; how a conceptual hydrogeological model is prepared; how water pressures are modelled numerically; how slope depressurisation systems are implemented; and how the performance of a slope depressurisation program is monitored and reconciled with the design. Guidelines for Evaluating Water in Pit Slope Stability offers slope design practitioners a road map that will help them decide how to investigate and treat water pressures in pit slopes. It provides guidance and essential information for mining and civil engineers, geotechnical engineers, engineering geologists and hydrogeologists involved in the investigation, design and construction of stable rock slopes.
Author: G. P. Kruseman
Publisher:
ISBN:
Category : Aquifers
Languages : en
Pages : 388
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Author:
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ISBN:
Category : Environmental engineering
Languages : en
Pages : 692
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