科研之友
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摘要
The time-varying transport dynamics of complex hydrodynamic systems with long transit times are difficult to observe due to the need for multiple tracer injections. Where only one or two distinct tracers are available, overprinting in the output concentrations limits the injection frequency. In this letter we propose an experimental method (the Periodic Tracer Hierarchy) that allows overprinted breakthrough curves to be decomposed into contributions from multiple injections of the same tracer, so long as the transporting flow is periodic. This method allows the time-varying transit time distributions to be observed efficiently while making no a priori assumptions about the transport processes operating in the system. Simulations of transport through a soil column subject to a periodic sequence of irrigation events demonstrate that the distinct transit time distributions associated with each irrigation event can be retrieved almost exactly. Key Points Observations of time-variable lumped transport need multiple tracer injections Method decomposes overprinted breakthrough curves into individual contributions Allows efficient use of single tracer in experimental studies with periodic flow
- 出版日期2014-3-16
