Comparison of instantaneous and constant-rate stream tracer experiments through non-parametric analysis of residence time distributions
Article first published online: 4 JUN 2008
Copyright 2008 by the American Geophysical Union.
Water Resources Research
Volume 44, Issue 6, June 2008
How to Cite
2008), Comparison of instantaneous and constant-rate stream tracer experiments through non-parametric analysis of residence time distributions, Water Resour. Res., 44, W06404, doi:10.1029/2007WR006274., , , , , , , and (
- Issue published online: 4 JUN 2008
- Article first published online: 4 JUN 2008
- Manuscript Accepted: 5 FEB 2008
- Manuscript Revised: 30 NOV 2007
- Manuscript Received: 16 JUN 2007
- Residence time distribution;
- tracer experiments;
- stream hydrology
 Artificial tracers are frequently employed to characterize solute residence times in stream systems and infer the nature of water retention. When the duration of tracer application is different between experiments, tracer breakthrough curves at downstream locations are difficult to compare directly. We explore methods for deriving stream solute residence time distributions (RTD) from tracer test data, allowing direct, non-parametric comparison of results from experiments of different durations. Paired short- and long-duration field experiments were performed using instantaneous and constant-rate tracer releases, respectively. The experiments were conducted in two study reaches that were morphologically distinct in channel structure and substrate size. Frequency- and time domain deconvolution techniques were used to derive RTDs from the resulting tracer concentrations. Comparisons of results between experiments of different duration demonstrated few differences in hydrologic retention characteristics inferred from short- and long-term tracer tests. Because non-parametric RTD analysis does not presume any shape of the distribution, it is useful for comparisons across tracer experiments with variable inputs and for validations of fundamental transport model assumptions.