DCHP-1 Online
riffle ((v.)) [< n.] 
v. ruffle; cause to form into wavelets or ripples.
- 1903 Suddenly you make out the bottom . . . and the big suckers and catfish idling over its riffled sands. . . .
- 1954 As Hazel walked down the crooked hauling-road, her ears caught the slight rushing murmur of the Black Brook, riffling across a stretch of stony bottom.
- 1958 So land-locked and cliff-flanked is the Inlet that the surface waters are rarely riffled by wind and so make a perfect mirror.
- 1903 Suddenly you make out the bottom . . . and the big suckers and catfish idling over its riffled sands. . . .