. Hydrochemical, vegetational and microbiological effects of a natural and a constructed wetland on the control of acid mine drainage . Mine drainage; Acid mine drainage; Wetlands. dh/dl = average hydraulic gradient dh = change in head dl = change in length Interpretation of the results of tracer tests involves plotting the concentration of a tracer as a function of time or volume of water passing through the aquifer. In the resulting "breakthrough curve" the concentration is commonly given as a ratio of the measured concentration at the observation well, "C", to the initia
. Hydrochemical, vegetational and microbiological effects of a natural and a constructed wetland on the control of acid mine drainage . Mine drainage; Acid mine drainage; Wetlands. dh/dl = average hydraulic gradient dh = change in head dl = change in length Interpretation of the results of tracer tests involves plotting the concentration of a tracer as a function of time or volume of water passing through the aquifer. In the resulting "breakthrough curve" the concentration is commonly given as a ratio of the measured concentration at the observation well, "C", to the initial tracer concentration injected, "Co". The average travel time of a non-reactive (conservative) tracer can be determined from a breakthrough curve for transport from the injection point to the observation point. The first arrival time of a tracer as it moves through the system represents the maximum velocity of the groundwater. The peak concentration of the tracer represents the average transit time of groundwater through the system, if a conservative tracer is used. Retardation of the transit time of a tracer is related to the breath of the breakthrough curve. Figure 5-1 gives hypothetical examples of breakthrough curves for a mixture of tracers injected as a single slug into an aquifer. Notice the change in the curve shape when the tracer is not conservative and interacts with the aquifer Breakthrough curves of four different tracer types: (a) is conservative, (b) some effect of sorption, (c) large effect of sorption, and (d) precipitated or destroyed (From Davis et al, 1985). 25. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Montana State University (Bozeman, Mont. ). Reclamation Research Unit; Dollhopf, D. J; MSI Detoxification, Inc. [Bozeman, Mont. ? : Montana State Univ. ?]
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