Modified Convergent Flow Tracing Method for Evaluating Advective Velocity and Effective Porosity in Fractured Rock Aquifers
| Autor: | Byung-Woo Kim, Hangbok Lee |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Hydraulic engineering
010504 meteorology & atmospheric sciences Flow tracer modified convergent flow tracing method Geography Planning and Development convergent flow tracer test 0207 environmental engineering 02 engineering and technology Aquatic Science Tracing 01 natural sciences Biochemistry lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 TRACER 020701 environmental engineering Porosity 0105 earth and related environmental sciences Water Science and Technology drift-and-pumpback equations lcsh:TD201-500 Advection Mechanics Effective porosity Volumetric flow rate effective porosity Flow (mathematics) solute transport Geology |
| Zdroj: | Water, Vol 12, Iss 3565, p 3565 (2020) Water Volume 12 Issue 12 |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w12123565 |
| Popis: | This study presented the analysis of the modified convergent flow tracing method, which is a modified virtual solute transport approach to retrieve tracer masses from a pulse image (virtual) well to an extraction well. In the convergent flow tracer test, approximate analytical solutions were extended for the pulse image well using a single-well tracing method. This method transformed the drift-and-pumpback conditions of the single-well tracing method. The method requires a prior information of the effective porosity. Using sodium chloride as a tracer mass, the tracer data sampled through field-scale tests were used to obtain breakthrough curves. This modified method was different from the pre-existing single method because it considers both the ambient groundwater movement (the two classes of drifts) and the constant volumetric flow rate during the pumping phase. The method was applied to the tracer test at underground research tunnel for verifying the theory inductively derived from the single tracing method. Through field tests, the values of velocity and porosity were compared to the results of the drift-and-pumpback equations of the single-well test, and the several different equations related to breakthrough curves of the two-well tests conducted on a field scale. |
| Databáze: | OpenAIRE |
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