| Автор | Raven, K. G. |
| Автор | Novakowski, K. S. |
| Автор | Lapcevic, P. A. |
| Дата выпуска | 1988 |
| dc.description | The results and interpretation of five induced‐gradient tracer tests performed at five different average interborehole fluid velocities in a single fracture in monzonitic gneiss are described. The experiments were conducted using radioactive <sup>82</sup>Br and a fluorescent dye as conservative tracers where the tracers were pulse injected into radial convergent and injection‐withdrawal flow fields. The flow fields were established between straddle packers isolating the fracture in three boreholes over distances of 12.7–29.8 m. The tracer breakthrough curves were determined from samples of the withdrawn groundwater and were interpreted using residence time distribution (RTD) theory and two deterministic simulation models. The RTD curves of the tracer experiments were interpreted by fitting to the field data a simple advection‐dispersion model and an advection‐dispersion model with transient solute storage in immobile fluid zones. Both models consider the different flow field geometries associated with injection‐withdrawal and radial convergent tests. Comparison of the fits obtained by the simulation models suggest that the initial period of solute transport in single fractures is advection dominated and with increasing tracer residence time or decreasing fluid velocity, transport progresses toward more Fickian‐like behavior. During the advective‐dominated period, the transient solute storage model is shown to adequately describe the asymmetries and long tails characteristic of the fracture RTDs. Interpretation of the tracer experiments using both simulation models further suggests that induced‐gradient tracer experiments are likely to underestimate the dispersive characteristics of single fractures under natural flow conditions. |
| Формат | application.pdf |
| Копирайт | Copyright 1988 by the American Geophysical Union. |
| Тема | HYDROLOGY |
| Тема | Groundwater/surface water interaction |
| Тема | PHYSICAL PROPERTIES OF ROCKS |
| Тема | Transport properties |
| Тема | Fracture and flow |
| Тема | Permeability and porosity |
| Название | Interpretation of field tracer tests of a single fracture using a transient solute storage model |
| Тип | article |
| DOI | 10.1029/WR024i012p02019 |
| Electronic ISSN | 1944-7973 |
| Print ISSN | 0043-1397 |
| Журнал | Water Resources Research |
| Том | 24 |
| Первая страница | 2019 |
| Последняя страница | 2032 |
| Выпуск | 12 |
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