The Hvorslev () method of slug test analysis addresses a variety of well and aquifer geometries, is easy to apply, and is widely used. Its underlying. The Hvorslev () slug test is designed to estimate the hydraulic conductivity of an aquifer. The rate of inflow or outflow, q, at the piezometer tip at any time t is. with three different methods of analysis: Hvorslev, Bouwer-Rice and . The basic Hvorslev () equation, if the length of the piezometer.
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For a well abutting a confining unit, Equation 1 is replaced by the following expression: While intended for confined aquifers, the Hvorslev method can yield appropriate estimates of K for overdamped tests in unconfined aquifers as long as the well screen is not too close to the water table more information.
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Hvorslev Slug Test Solution for Confined Aquifers
For a well abutting a confining unit, Equation 1 is replaced by the following expression:. Downward hydraulic potentials were identified down to 65 m and upward potentials from the bottom up to 65 m. Danish-American geotechnical engineer Mikael Juul Hvorslev introduced an approximate mathematical model for the interpretation of overdamped slug tests in partially penetrating wells or piezometers.
Scientific Research An Academic Publisher. This work aims to contribute to the development of this subject, through the presentation of the results of an investigation in which geophysical hvorsev tools and straddle packers were used, which allowed the development of a more suitable hydrogeological conceptual model of the study area.
Corps of Engrs, U.
Hvorslev’s equation for a partially penetrating well or piezometer not in contact with an impermable boundary is hvorlsev follows:.
The investigation of contaminated areas in fractured aquifers represents a great technical challenge, due to the frequent conditions of heterogeneity and anisotropy of these environments, which often make it difficult to identify and predict pathways of subsurface contamination. The following assumptions apply to the use of hvkrslev Hvorslev slug test method: Heatpulse flowmeter and straddle packers were then used to obtain data on hydraulic potentials and flows and for the collection of discrete water samples for chemical analysis.
AQTESOLV includes recommended head ranges Butler for the Hvorslev solution that can reduce ambiguity when interpreting response data with a concave upward appearance. In the case of a fully penetrating well, the following relationship is used instead of Equation 1 Butler Hvorslev’s transient solution omits storativity of the formation and assumes quasi-steady-state flow between the control well and the tested formation.
Army, Vicksburg, Mississippi, pp. Note that r w is typically taken as the borehole radius i.
Hvorslev Slug Test Solution for Confined Aquifers
Seven groups of fractures were defined, being those of Group 1, with low dip angles, the most frequent and important for flow until 65 m, and Group 2 N to NE-SW with high dips to W and NW more frequent in deeper hvorskev gneisses.
Journal of Water Resource and ProtectionVol. A hydraulic test allowed identifying the occurrence of hydraulic connection between the shallow weathering zone and the underlying fractured aquifer. Zlotnik introduced an equivalent well radius for partially penetrating wells to incorporate hydraulic conductivity anisotropy.
Corps of Engrs, U. Two boreholes were drilled and geophysical logging gamma, caliper and high resolution acoustic televiewer were used for the geological-structural characterization of the aquifer. Analysis involves matching a straight line to water-level displacement data collected during an overdamped slug test. Hvorslev’s equation for a partially penetrating well or piezometer not in contact with an impermable boundary is as follows: