期刊
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
卷 118, 期 1, 页码 155-165出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2012JF002374
关键词
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资金
- NSF [EAR-0636043]
- Natural Sciences and Engineering Research Council of Canada
- National Center for Earth Surface Dynamics, an NSF Science and Technology Center [EAR-0120904]
- Division Of Earth Sciences
- Directorate For Geosciences [1242458] Funding Source: National Science Foundation
Previous work highlights the need for data collection to identify appropriate models for temporal evolution of tracer dispersal in rivers. Results of 64 gravel-bed field tracer experiments covering a wide range of flow and sediment supply regimes are compiled here to determine the probabilistic character of gravel transport. We focus on whether particle travel distances and waits are thin- or heavy-tailed. While heavy-tailed travel distance distributions are observed between successive monitoring events in different hydrological and sediment supply regimes, heavy-tailedness does not persist through total travel distance over multiple monitoring events, suggesting that individual monitoring events occur before particle travel distance exceeds the characteristic correlation length for the channel ( such that particles that start in fast paths remain in fast paths and particles in slow paths remain in slow paths). After a large number of transport events, super-diffusive spreading was not observed at any of the gravel bed streams. Continuous-time tracking of x, y, z coordinates of tracers in natural streams is necessary to capture exact step and waiting time distributions.
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