Ĭhurch M, Jones D (1982) Channel bars in gravel bed rivers. Ĭhurch M, Hassan MA (2002) Mobility of bed material in Harris Creek. J Geophys Res Earth Surf 123:2735–2766Ĭhartrand SM, Jellinek AM, Hassan MA, Ferrer-Boix C (2019) What controls the disequilibrium state of gravel-bed rivers? Earth Surf Proc Land 44(15):3020–3041. Water Resour Res 51(11):8704–8728Ĭhartrand SM, Jellinek AM, Hassan MA, Ferrer-Boix C (2018) Morphodynamics of a width-variable gravel bed stream: new insights on pool-riffle formation from physical experiments. Earth Surf Proc Land 25:583–600Ĭhartrand SM, Hassan MA, Radić V (2015) Pool-riffle sedimentation and surface texture trends in a gravel bed stream. Earth Surf Process Land 16:19-31Ĭhartrand SM, Whiting PJ (2000) Alluvial architecture in headwater streams with special emphasis on step-pool topography.
Earth Surf Proc Land 19:319–332Ĭarling PA (1991) An appraisal of the velocity-reversal hypothesis for stable riffle-pool sequences in the River Severn, England. Earth Surf Process Land 25:369–384Ĭarling PA, Wood N (1994) Simulation of flow over pool-riffle topography: a consideration of the velocity reversal hypothesis. Master thesis Department of Geography, The University of British Columbia, Vancouver, British Columbia, Ĭarling PA, Orr HG (2000) Morphology of riffle–pool sequences in the River Severn, England. Keywordsīuckrell E (2017) The formation and adjustment of a pool-riffle sequence in a gravel bed flume. These sequences are also critical for determining particle mobility and transport in a wide range of flows and sediment supply regimes. However, riffle-pool sequences possess clear evidence of geomorphic stability as the morphological sequence and character persists under a range of conditions. Our field and experimental results show that in a natural riffle-pool morphology changes in flow rates and sediment input can drive local changes in bed topography and cause dynamic trends in sediment transport volume and texture. To better understand the evolution of stream channels with riffle-pool morphologies responding to changes in sediment supply and flow regime, we conducted a flume experiment with four runs. This persistence suggests that the riffle-pool morphology is dynamically stable and is maintained through adjustment of internal processes. The channel adjusts to flow and sediment supply regimes both vertically (erosion/deposition) and laterally, resulting in sediment movement through the reach while the riffle-pool morphology persists. To achieve our goals, we use a longitudinal monitoring campaign of 12 years of field measurements and flume experiments. In this paper, we examine temporal and spatial patterns of channel adjustment, sediment mobility and geomorphic stability of a riffle-pool reach to changes in flow and sediment supply regimes. Riffle-pool morphologies are common in gravel bed streams yet the conditions and feedbacks that maintain them remain poorly understood.
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