Spatio-temporal patterns of sediment particle movement on 2D and 3D bedforms
Spatio-temporal patterns of sediment particle movement on 2D and 3D bedforms
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DOI：
10.1007/s00348-018-2551-y
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发表时间：
2018-05
影响因子：
2.4
通讯作者：
R. Tsubaki;S. Baranya;M. Muste;Yuji Toda
中科院分区：
文献类型：
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作者：
R. Tsubaki;S. Baranya;M. Muste;Yuji Toda
进行了一项实验研究，以探索明渠中沉积物颗粒的运动及其与床形特征的关系。使用高清水下摄像机来记录沙丘长度范围内的粒子运动图像。进行图像处理是为了考虑由于河床几何不规则性和水面光反射造成的照明不均匀性。随后使用定制算法识别运动颗粒，然后使用颗粒图像测速法评估沉积物颗粒的瞬时速度分布。获得的实验结果表明，沙丘顶部沉积物颗粒的运动因沙丘几何形状（即分别为二维或三维）而异。还讨论了沉积物运动及其与沙丘形状和动力学的关系。
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.