Bei instationärer Strömung werden nach längerer Zeit die Veränderungen der linear laminaren Verluste im Grundwasserleiter bedeutend. In manchen Fällen sind die turbulenten Verluste vernachlässigbar klein. Der Koeffizient C beinhaltet die nicht-linear laminaren Verluste im Filterkies und die turbulenten Druckverluste, die bei der Einströmung in den Brunnenfilter und bei der vertikalen Aufströmung in Filter- und Aufsatzrohren entstehen. Der Koeffizient B enthält nicht nur die Druckverluste des Grundwasserleiters, sondern auch die linearen Druckverluste, die im Filterkies und in der Skin-Schicht auftreten, soweit vorhanden. Daraus kann der physikalische Hintergrund beider Koeffizienten abgeleitet werden. Diese Studie analysiert und separiert die linear laminaren, nicht-linear laminaren und turbulenten Druckverluste, die bei der Strömung vom Grundwasserleiter bis zum verfilterten Brunnen entstehen. 112:1047–1070.ĭie Koeffizienten B und C der Gleichung von Jacob (1947) werden aus Leistungspumpversuchen bestimmt und gewöhnlich als “Grundwasserleiterverluste (Aquiferverluste)” bzw. (1947) Drawdown test to determine effective radius of artesian wells. A new, explicit formulation of the Jacob equation was compared to long-duration field step-drawdown tests, three in confined unconsolidated formations and one in a fractured rock aquifer. For transient flow at larger times, the changes in linear laminar losses within the aquifer become important. In some cases, the turbulent losses are small enough to be omitted. Coefficient C contains nonlinear laminar losses from the gravel pack and turbulent losses caused by screen inflow and vertical flow through the screen and casing. The coefficient B does not contain only aquifer losses but also linear losses from the gravel pack and wellbore skin, if present. From this, one can derive a detailed physical meaning for both coefficients. This paper analyzes and separates the linear laminar, nonlinear laminar and turbulent losses occurring during flow from an aquifer to a screened well. London: McGraw-Hill, 403p.Īrid Lands, Engineering Geology Channelization and Bank Stabilization Coastal Inlets, Engineering Geology Dams, Engineering Geology Formation Pressures, Abnormal Geomorphology, Applied Hydrodynamics, Porous Media HYDROLOGY Pumping Stations and Pipelines, Engineering Geology River Engineering Urban Hydrology Wells, Aerial Wells, Water.Coefficients B and C of the Jacob (1947) equation, usually derived from step-drawdown tests, are commonly attributed to “aquifer losses” and “well losses”, respectively. Chicago: University of Chicago Press, 542–563. (ed.), Man's Role in changing the Face of the Earth. Changes in quantities and qualities of ground and surface waters, in W. The hydrological map of Europe, Episodes 4, 16–18. Hydrogeology-definition and application, Ground Water 4, 2–4. Biscayne aquifer of Dade and Broward counties, Florida, Florida Geol. Modeling techniques for groundwater evaluation, Advances in Hydroscience 10, 1–143. Water resources of southern Florida, U.S. Advances in borehole geophysics for hydrology, Geol. Water at the Surface of the Earth, International Geophysics Series, Vol. The Occurrence of Ground Water in the United States: With a Discussion of Principles, U.S. Hydrology: The Fundamental Basis of Hydraulic Engineering. The Global water balance, Eos 54 (1), 33. Port Washington, N.Y.: Water Information Center, 568p. Symposium Underground Waste Management and Artificial Recharge (New Orleans, Sept. Injection of acidic industrial waste into a saline carbonate aquifer: geochemical aspects, 2nd Internat. New York: Van Nostrand Reinhold, 515–519. Fairbridge (ed.), The Encyclopedia of Geochemistry and Environmental Sciences. Department of Agriculture 1941 Yearbook of Agriculture). The hydrologic cycle, in Climate and Man (U.S. Physical Hydrogeology, Benchmark Papers in Geology, Vol. An atlas of Long Island's water resources, New York Water Resources Comm. Chow (ed.), Handbook of Applied Hydrology. Hydrogeology of deep aquifers: the hydrogeological basin as the basis of groundwater management, Episodes 3, 18–22.Ĭhow, V. Parkville, Victoria: Australasian Institute of Mining and Metallurgy, 295p.Ĭastany, G., 1981. Falls Church, Va.: American Geological Institute, 751p.īerkman, D. Stroudsburg, Pa.: Hutchinson Ross, 432p.īates, R. Chemical Hydrogeology, Benchmark Papers in Geology, Vol.
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