Abstract
Two tracer tests with conservative species have been carried out in a shallow glacial sand aquifer at the BGS in situ research site at Drigg in Cumbria. The objectives of the tests were to determine the transport properties of the aquifer, to compare the use of the three `conservative` tracers (chloride as NaCI, iodine-131 as KI and tritium as HTO) and to provide a reference for further experiments involving chemical reactive solutes. A 2-D layered model was used to estimate the hydraulic conductivity of each layer from the tracer breakthroughs. A 1-D analytical solution to the advection-dispersion equation was used to estimate the dispersion lengths of each layer. Longitudinal dispersion lengths ranged from 0.5 cm to 5 cm; 50-150 times less than the path length. The aquifer properties are slightly altered by the running of the tests. Thus, future tests with reactive tracers should be carried out with simultaneous injection of a conservative tracer for comparison. On a simple level the aquifer can be characterized as a number of layers with a high conductivity zone in the middle and small dispersion lengths of the order of a centimetre, although the detailed flow patterns are quite complex resulting in multiple peaks
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Sen, M A;
Williams, G M;
Wealthall, G P
[1]
- British Geological Survey, Keyworth (GB). Fluid Processes Research Group
Citation Formats
Sen, M A, Williams, G M, and Wealthall, G P.
Analysis of the migration of Cl, {sup 131}I and {sup 3}H in a shallow sand aquifer.
France: N. p.,
1991.
Web.
Sen, M A, Williams, G M, & Wealthall, G P.
Analysis of the migration of Cl, {sup 131}I and {sup 3}H in a shallow sand aquifer.
France.
Sen, M A, Williams, G M, and Wealthall, G P.
1991.
"Analysis of the migration of Cl, {sup 131}I and {sup 3}H in a shallow sand aquifer."
France.
@misc{etde_10131336,
title = {Analysis of the migration of Cl, {sup 131}I and {sup 3}H in a shallow sand aquifer}
author = {Sen, M A, Williams, G M, and Wealthall, G P}
abstractNote = {Two tracer tests with conservative species have been carried out in a shallow glacial sand aquifer at the BGS in situ research site at Drigg in Cumbria. The objectives of the tests were to determine the transport properties of the aquifer, to compare the use of the three `conservative` tracers (chloride as NaCI, iodine-131 as KI and tritium as HTO) and to provide a reference for further experiments involving chemical reactive solutes. A 2-D layered model was used to estimate the hydraulic conductivity of each layer from the tracer breakthroughs. A 1-D analytical solution to the advection-dispersion equation was used to estimate the dispersion lengths of each layer. Longitudinal dispersion lengths ranged from 0.5 cm to 5 cm; 50-150 times less than the path length. The aquifer properties are slightly altered by the running of the tests. Thus, future tests with reactive tracers should be carried out with simultaneous injection of a conservative tracer for comparison. On a simple level the aquifer can be characterized as a number of layers with a high conductivity zone in the middle and small dispersion lengths of the order of a centimetre, although the detailed flow patterns are quite complex resulting in multiple peaks on some breakthrough curves. Using 1-D transport analysis should be adequate to estimate any retardation effects on a reactive tracer. Any of chloride, iodide-131 or tritium could be used as conservative reference tracers in future tests, although the analytical precision offered by radiotracers is to be preferred. 15 figs.; 6 tab.; 5 refs.}
place = {France}
year = {1991}
month = {Dec}
}
title = {Analysis of the migration of Cl, {sup 131}I and {sup 3}H in a shallow sand aquifer}
author = {Sen, M A, Williams, G M, and Wealthall, G P}
abstractNote = {Two tracer tests with conservative species have been carried out in a shallow glacial sand aquifer at the BGS in situ research site at Drigg in Cumbria. The objectives of the tests were to determine the transport properties of the aquifer, to compare the use of the three `conservative` tracers (chloride as NaCI, iodine-131 as KI and tritium as HTO) and to provide a reference for further experiments involving chemical reactive solutes. A 2-D layered model was used to estimate the hydraulic conductivity of each layer from the tracer breakthroughs. A 1-D analytical solution to the advection-dispersion equation was used to estimate the dispersion lengths of each layer. Longitudinal dispersion lengths ranged from 0.5 cm to 5 cm; 50-150 times less than the path length. The aquifer properties are slightly altered by the running of the tests. Thus, future tests with reactive tracers should be carried out with simultaneous injection of a conservative tracer for comparison. On a simple level the aquifer can be characterized as a number of layers with a high conductivity zone in the middle and small dispersion lengths of the order of a centimetre, although the detailed flow patterns are quite complex resulting in multiple peaks on some breakthrough curves. Using 1-D transport analysis should be adequate to estimate any retardation effects on a reactive tracer. Any of chloride, iodide-131 or tritium could be used as conservative reference tracers in future tests, although the analytical precision offered by radiotracers is to be preferred. 15 figs.; 6 tab.; 5 refs.}
place = {France}
year = {1991}
month = {Dec}
}