LCZO -- Sediment Transport -- Mameyes Watershed -- (2010-2012)

Radio Frequency Identification tagged cobble survey data from the Rio Mameyes . Tagged tracers with positions overtime. Additional documentation is presented within the dataset file. Sediment transport is an intrinsically stochastic process, and measurement of bed load in the environment is further complicated by the unsteady nature of river flooding. Here we present a methodology for analyzing sediment tracer data with unsteady forcing. We define a dimensionless impulse by integrating the cumulative excess shear velocity for the duration of measurement, normalized by grain size. We analyze the dispersion of a plume of cobble tracers in a very flashy stream over two years. The mean and variance of transport distance collapse onto well-defined linear and power-law relations, respectively, when plotted against cumulative dimensionless impulse. Data suggest that the asymptotic limit of bed load tracer dispersion is super diffusive, in line with a broad class of geophysical flows exhibiting strong directional asymmetry (advection), thin-tailed step lengths and heavy-tailed waiting times. The impulse framework justifies the use of quasi-steady flow approximations for long-term river evolution modeling.来自马梅塞斯河（Rio Mameyes）的射频识别（Radio Frequency Identification, RFID）标记卵石勘测数据集，包含随时间记录位置的标记示踪剂数据。数据集文件中附带了额外的说明文档。泥沙输运本质上属于随机过程，而河流洪水的非稳态特性进一步加剧了野外推移质（bed load）输沙测量的复杂性。本研究提出了一种针对非稳态强迫条件下泥沙示踪数据的分析方法：通过对测量时长内的累积超额剪切流速进行积分，并以颗粒粒径进行归一化，定义了无量纲冲量。我们对两年内一条暴涨暴落溪流中的卵石示踪剂羽流的扩散过程开展了分析。当以累积无量纲冲量为横坐标绘图时，输运距离的均值和方差分别收敛于明确的线性关系与幂律关系。数据表明，推移质示踪剂扩散的渐近极限为超扩散，这与一类具备强方向不对称性（平流）、薄尾步长及重尾等待时间的地球物理流动规律一致。该冲量框架为长期河流演化建模中采用准稳态流动近似提供了理论支撑。