Spatio-temporal patterns of sediment particle movement on 2D and 3D bedforms
An experimental study was conducted to explore sediment particle motion in an open channel and its relationship to bedform characteristics. High-definition submersed video cameras were utilized to record images of particle motion over a dune’s length scale. Image processing was conducted to account for illumination heterogeneity due to bedform geometric irregularity and light reflection at the water’s surface. Identification of moving particles using a customized algorithm was subsequently conducted and then the instantaneous velocity distribution of sediment particles was evaluated using particle image velocimetry. Obtained experimental results indicate that the motion of sediment particles atop dunes differs depending on dune geometry (i.e., two-dimensional or three-dimensional, respectively). Sediment motion and its relationship to dune shape and dynamics are also discussed.
We acknowledge the critical support offered by graduate students H. Xu and H-W. Tsai in conducting laboratory experiments. Valuable practical inputs were received from B. Barquist and J. Niemeyer in assembling various in-house developed components. The first author is grateful to participants at IIHR seminars where he introduced some portions of this study. His effort was partially funded by grants from the Chugoku Civil Engineering Foundation for Mutual Aid, Japan; the Foundation for River and Watershed Environment Management, Japan; and JSPS KAKENHI Grant Numbers JP17K06574 and JP17K06575. Collected and processed laboratory data are available from the corresponding author. The second author acknowledges the support of the ÚNKP-17-4/III, from the New National Excellence Program of the Ministry of Human Capacities, Hungary.
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