A riffle is a shallow landform in a flowing channel, and it has specific topographic, sedimentary, and hydraulic indicators. These are almost always assessed at a very low discharge compared to the flow that fills the channel (approximately 10–20%), and as a result the water moving over a riffle appears shallow and fast, with a wavy, disturbed water surface. The water's surface over a riffle at low flow also has a much steeper slope than that over other in-channel landforms. Channel sections with a mean water surface slope of roughly 0.1 to 0.5% exhibit riffles, though they can occur in steeper or gentler sloping channels with coarser or finer bed materials, respectively. Except in the period after a flood (when fresh material is deposited on a riffle), the sediment on the riverbed in a riffle is usually much coarser than on that in any other in-channel landform.
Terrestrial valleys normally consist of channels – geometric depressions in the valley floor carved by flowing water – and overbank regions that include floodplains and terraces. Some channels have shapes and sizes that hardly change along the river; these do not have riffles. However, many channels exhibit readily apparent changes in width, bed elevation, and slope. In these cases, scientists realized that the riverbed often tends to rise and fall with distance downstream relative to an average elevation of the river's slope. That led scientists to map the bed elevation down the deepest path in a channel, called the thalweg, to obtian a longitudinal profile. Then, the piecewise linear slope of the river is computed and removed to leave just the rise and fall of the elevation about the channel's trendline. According to the zero-crossing method, riffles are all the locations along the channel whose residual elevation is greater than zero. Because of the prevalence of this method for identifying and mapping riffles, riffles are often thought of as part of a paired sequence, alternating with pools- the lows between the riffles. However, modern topographic maps of rivers with meter-scale resolution reveal that rivers exhibit a diversity of in-channel landforms.
For a long time, scientists have observed that, all other things being equal, riffles tend to be substantially wider than other in-channel landforms, but only recently has there been high enough quality of river maps to confirm that this is true. The physics mechanism that explains why this happens is called flow convergence routing. This mechanism may be used in river engineering to design self-sustainable riffles, given a suitable sediment supply and flow regime. When an in-channel landform is shallow and narrow, instead of shallow and wide, it is called a nozzle.
Riffles are biologically very important, because many aquatic species rely on them in one way or another. Many benthic macroinvertebrates are present in riffles, so fish often locate just downstream of a riffle to wait for these small creatures to drift down to them. That draws fisherman to these natural fish feeding stations as well. Riffles also serve to aerate the water, increasing the amount of dissolved oxygen.
- Leopold, Luna; Wolman, M. Gordon (1957). "River channel patterns: Braided, meandering, and straight". Professional Paper 282-B. United States Geological Survey.
- Wyrick, J. R.; Senter, A. E.; Pasternack, G. B. (2014-04-01). "Revealing the natural complexity of fluvial morphology through 2D hydrodynamic delineation of river landforms". Geomorphology. 210: 14–22. Bibcode:2014Geomo.210...14W. doi:10.1016/j.geomorph.2013.12.013.
- Milne, J. A. (1982-04-01). "Bed-material size and the riffle-pool sequence". Sedimentology. 29 (2): 267–278. Bibcode:1982Sedim..29..267M. doi:10.1111/j.1365-3091.1982.tb01723.x. ISSN 1365-3091.
- Carling, Paul A.; Orr, Harriet G. (2000-04-01). "Morphology of riffle–pool sequences in the River Severn, England". Earth Surface Processes and Landforms. 25 (4): 369–384. doi:10.1002/(SICI)1096-9837(200004)25:43.0.CO;2-M. ISSN 1096-9837.
- Wyrick, J. R.; Pasternack, G. B. (2014-05-15). "Geospatial organization of fluvial landforms in a gravel–cobble river: Beyond the riffle–pool couplet". Geomorphology. 213: 48–65. Bibcode:2014Geomo.213...48W. doi:10.1016/j.geomorph.2013.12.040.
- Richards, K. S. (1976-06-01). "Channel width and the riffle-pool sequence". GSA Bulletin. 87 (6): 883–890. doi:10.1130/0016-7606(1976)87<883:CWATRS>2.0.CO;2. ISSN 0016-7606.
- Brown, Rocko A.; Pasternack, Gregory B. (2017-01-11). "Bed and width oscillations form coherent patterns in a partially confined, regulated gravel–cobble-bedded river adjusting to anthropogenic disturbances". Earth Surface Dynamics. 5 (1): 1–20. Bibcode:2017ESuD....5....1B. doi:10.5194/esurf-5-1-2017. ISSN 2196-6311.
- MacWilliams, Michael L.; Wheaton, Joseph M.; Pasternack, Gregory B.; Street, Robert L.; Kitanidis, Peter K. (2006-10-01). "Flow convergence routing hypothesis for pool-riffle maintenance in alluvial rivers". Water Resources Research. 42 (10): W10427. Bibcode:2006WRR....4210427M. doi:10.1029/2005WR004391. ISSN 1944-7973.
- Sawyer, April M.; Pasternack, Gregory B.; Moir, Hamish J.; Fulton, Aaron A. (2010-01-15). "Riffle-pool maintenance and flow convergence routing observed on a large gravel-bed river". Geomorphology. 114 (3): 143–160. Bibcode:2010Geomo.114..143S. doi:10.1016/j.geomorph.2009.06.021.
- Wheaton, Joseph M.; Brasington, James; Darby, Stephen E.; Merz, Joseph; Pasternack, Gregory B.; Sear, David; Vericat, Damiá (2010-05-01). "Linking geomorphic changes to salmonid habitat at a scale relevant to fish". River Research and Applications. 26 (4): 469–486. doi:10.1002/rra.1305. ISSN 1535-1467.
- Brown, Rocko A.; Pasternack, Gregory B.; Lin, Tin (2016-04-01). "The Topographic Design of River Channels for Form-Process Linkages". Environmental Management. 57 (4): 929–942. Bibcode:2016EnMan..57..929B. doi:10.1007/s00267-015-0648-0. ISSN 0364-152X.
- Gary Chapman (1986). Ambient Aquatic Life Water Quality Criteria for Dissolved Oxygen. U.S. Environmental Protection Agency, Office of Water Regulations and Standards. p. 3.
- Setting up a Riffle Tank, by Cliff Zoller