Stream Recovery Post Channelization: A Case Study of Low-Gradient Streams in Central Illinois, USA

Stream channelization, which entails reducing the sinuosity of a stream, widening, and in some cases deepening stream channel, is widespread practice agricultural regions. Channelization efforts central Illinois have significant impacts on geomorphology, flow regime, sediment transport both adjacent to modified reaches. The goal this study was characterize changes channels by comparing three streams that are at various stages recovery post 5 years (1900N), 7 (Frog), 35 (Bray), an unmodified reach (Crooked) estimate rate. Measured channel slopes within were one order magnitude larger than measured channelized Crooked. two most recently exhibited little geomorphic change since their while segment ago experienced bank failure immature meander development. lack redevelopment resulted values lower Crooked, reestablishment meanders similar Crooked would take estimated 11,000 years. distributions sediments all comprised poorly sorted sand pebbles. distribution resembles source, glacial diamicton serves as surficial sediments. Mobilization frequent, with recorded scour greater sedimentation. Overall, segments limited recovery. still degrading (1900N Frog) or transitioning into threshold stage (Bray).