Data underlying the publication: Bimodality in subaqueous dune height suggests flickering behavior at high flow

This is the dataset (raw input data, computing scripts, processed data, resulting figures) underlying the publication "Bimodality in subaqueous dune height suggests flickering behavior at high flow" (de Lange et al. 2025, Nature Communications). This publication describes how bedforms in sand-bedded rivers exhibit large variability in bedform size, when water flow strength increases. These observations are based on 1) reanalysis of experimental flume data from the previously published studies by Venditti et al. (2016, DOI: 10.1111/sed.12247) and Bradley & Venditti (2019, DOI: 10.1029/2018JF004832), and 2) analysis of experimental flume data from a new experiment we performed ourselves. Both the data from the two previous flume studies and from our own flume experiment consist of sand bed elevation measurements, measured as a function of space within the laboratory (flume) setup, and for a duration of several hours of flume run time. The computing scripts analyze these datasets, to derive river dune heights and lengths as a function of water flow strength and flume run time. These results form the basis for our publication (de Lange et al. 2025).

本数据集涵盖原始输入数据、计算脚本、处理后数据与生成图表，为论文《水下沙丘高度的双峰分布特征揭示强流条件下的闪烁行为》（de Lange等，2025年，《自然·通讯（Nature Communications）》）提供核心支撑。该论文阐明，砂质河床中的底形（bedform）尺寸会随水流强度升高呈现显著波动。本研究的观测数据来源于两部分：一是对Venditti等（2016，DOI: 10.1111/sed.12247）与Bradley & Venditti（2019，DOI: 10.1029/2018JF004832）已发表研究中的实验水槽（flume）数据开展的再分析；二是对本团队自主完成的全新实验水槽数据进行的分析。上述两项已有水槽研究与本团队自有水槽实验的数据，均为实验室水槽装置内沿空间分布的砂床高程测量值，且采集时长覆盖数小时的水槽运行周期。本研究的计算脚本对上述数据集进行处理，以推导得到不同水流强度与水槽运行时长下的河流沙丘高度与长度。上述研究结果构成了de Lange等（2025）发表论文的核心研究基础。