Analysis of the migration of Cl, 131I and 3H in a shallow sand aquifer
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 NaCl, iodine-131 as Kl 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 to 5 cm, 50-150 times less than the path length. The aquifer properties were slightly altered by the running of the tests. Future tests with reactive tracers should therefore be carried out with simultaneous injection of a conservative tracer for comparison.
Bibliographic Reference: EUR 13635 EN (1991) 71 pp., FS, ECU 7.50
ISBN: ISBN 92-826-2992-9
Record Number: 199111292 / Last updated on: 1994-12-02
Original language: en
Available languages: en