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WRRCTR No.96 Waste Injection into the Hawaiian Ghyben-Herzberg Aquifer: A Laboratory Study Using a Sand-Packed Hydraulic Model

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Title:WRRCTR No.96 Waste Injection into the Hawaiian Ghyben-Herzberg Aquifer: A Laboratory Study Using a Sand-Packed Hydraulic Model
Authors:Wheatcraft, Stephen W.
Peterson, Frank L.
Heutmaker, Duane L.
LC Subject Headings:Groundwater -- Pollution -- Hawaii.
Injection wells -- Hawaii.
Sewage disposal in the ground -- Models -- Hawaii.
Date Issued:Feb 1976
Publisher:Water Resources Research Center, University of Hawaii at Manoa
Citation:Wheatcraft SW, Peterson FL, Heutmaker DL. 1976. Waste injection into the Hawaiian Ghyben-Herzberg aquifer: a laboratory study using a sand-packed hydraulic model. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 96.
Series:WRRC Technical Report
Abstract:Injection of wastes into the Hawaiian subsurface environment presents
unique problems because the waste effluents normally are injected into the salt or brackish water underlying the fresh Ghyben-Herzberg lens. Because the waste water commonly has approximately the same density as fresh water, in addition to any ambient groundwater flow effects, a buoyant uplift is
produced which causes the injected waste to move upward and outward from the injection point as a buoyant plume.
A laboratory sand-packed hydraulic model was used to study the mechanics of buoyant plume movement, and the entrainment of salt water by the plume. Simulated waste effluent was injected into a density-stratified aquifer system under static groundwater conditions, and the effects on plume mechanics of varying several different injection parameters, such as injection depth, injection rate, type of injection source, density of receiving water, etc., were observed.
The laboratory studies indicated that although several of the injection parameters (most notably depth of the injection with respect to the saltfresh interface) have an effect on the details of the injection process and the plume movement and configuration, none of the injection parameters exerts a truly significant control on the ultimate fate of the injected
plume. That is, for the conditions stipulated in this study, the injection
plumes always migrated well up into the freshwater lens, regardless of variations in any of the several injection parameters. Furthermore, these experiments showed little evidence of entrainment of the surrounding salt water into the injected buoyant plumes, which strongly suggests that the principal means of plume movement is by mass displacement rather than by mixing processes.
Pages/Duration:vii + 88 pages
Appears in Collections: WRRC Technical Reports

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