![]() ![]() Riffles are typically found in the middle course of rivers, and are theoretically found at intervals around 6 times the width of the river, although local conditions cause this to vary. Nevertheless, the coarse-grained bedding of riffles suggests erosion of smaller particles, according to the Hjulstrom curve. In mining, the sectional stone or wood bottom lining of a sluice, arranged for trapping mineral particles, as of gold. A stretch of choppy water caused by such a shoal or sandbar a rapid. A shoal, reef, or shallow in a stream, producing a stretch of ruffled. A rocky shoal or sandbar lying just below the surface of a waterway. Riffles are produced during high flows by the accumulation of large bed materials. In mining, the sectional stone or wood bottom lining of a sluice, arranged for trapping mineral particles, as of gold. Riffle Definition A rocky shoal or sandbar lying just below the surface of a waterway. Riffle Gravel size or larger bed sediment where the stream is shallow and swift at low flows. Although simple fluid flow suggests slower flow in deeper water and faster flow over riffles, the true flow pattern pool and riffle waters is often helicoidal flow or turbulent, which permits more rapid erosion of the wetted perimeter. A rocky shoal or sandbar lying just below the surface of a waterway. Riffles are instrumental in the formation of meanders, with deeper pools forming alternately. ![]() Riffles are usually caused by an increase in a stream bed's slope or an obstruction in the water. As a result of the increased velocity and heightened turbulence, small ripples are frequently found. To prepare samples of material using a riffler.Įtymology: Possible alteration of ruffle, from ruffelen, akin toįreebase Rate this definition: 0.0 / 0 votesĪ Riffle is a short, relatively shallow and coarse-bedded length of stream over which the stream flows at higher velocity and higher turbulence than it normally does in comparison to a pool. To idly manipulate objects with the fingers. To shuffle playing cards by separating the deck in two and sliding the thumbs along the edges of the cards to mix the two parts. To skim or flick through the pages of a book. To flow over a fast moving shallow part of a stream. The act of shuffling cards the sound made while shuffling cards. A riffle is a shallow landform (elevated river bed) on a stream where water runs fast and in an agitated manner due to sediment deposits below the place. Also one of the cleats, grooves or steps in such trough.Ī quick skim through the pages of a book. Wiktionary Rate this definition: 0.0 / 0 votesĪ fast-flowing, shallow part of a stream causing broken water.Ī trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed. verb /rfl/ intransitive, transitive Verb Forms to turn over papers or the pages of a book quickly and without reading them all synonym leaf riffle through something He was riffling through the papers on his desk.
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