Skip to Main Content
Hyporheic exchange in gravel bed rivers with pool-riffle morphology: Laboratory experiments and three-dimensional modelingAuthor(s): Daniele Tonina; John M. Buffington
Source: Water Resources Research, 43: W01421.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
View PDF (1.25 MB)
DescriptionWe report the first laboratory simulations of hyporheic exchange in gravel pool-riffle channels, which are characterized by coarse sediment, steep slopes, and three-dimensional bed forms that strongly influence surface flow. These channels are particularly important habitat for salmonids, many of which are currently at risk worldwide and which incubate their offspring within the hyporheic zone. Here we perform a set of laboratory experiments examining the effects of discharge and bed form amplitude on hyporheic exchange, with surface-subsurface mixing measured directly from the concentration decay of a conservative tracer (fluorescein) injected into the surface flow. Near-bed pressure measurements were also used to predict hyporheic exchange from a three-dimensional pumping transport model. Comparison of the predicted and observed hyporheic exchange shows good agreement, indicating that the major mechanism for exchange is bed forminduced advection. However, the effect of bed forms is modulated by discharge and the degree of topographic submergence. We also tested the performance of the hydrostatic pressure as a proxy for the observed near-bed pressure in driving hyporheic exchange, which would facilitate field measurement and analysis of hyporheic flow in natural rivers. We found agreement with measured hyporheic exchange only for low bed form amplitudes and high flows.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationTonina, Daniele; Buffington, John M. 2007. Hyporheic exchange in gravel bed rivers with pool-riffle morphology: Laboratory experiments and three-dimensional modeling. Water Resources Research, 43: W01421.
Keywordsgravel bed rivers, hyporheic exchange, channels, salmonids
- Effects of stream discharge, alluvial depth and bar amplitude on hyporheic flow in pool-riffle channels
- Hyporheic exchange along a river below a dam
- Discussion of "Evaluating vertical velocities between the stream and the hyporheic zone from temperature data" by Seydell, I., Wawra, B.E., and Zanke, U.C.E. [Chapter 5].
XML: View XML