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推移质簇群是山区河流床面微地貌结构的重要组成部分，对泥沙输移、河床阻力及河道地形塑造具有显著影响。通过连续水流变化条件下的均匀推移质簇群演化概化试验，分析了簇群演变过程与水流强度响应关系及簇群形态的统计特征。试验结果表明，簇群形成数量的概率密度分布与水流强度关系密切，不同床面布置形式的簇群演变过程特征参数存在差异。矩形密排床面的簇群形成、稳定、崩解阶段存在明确的水流强度阈值，通过对颗粒与床面接触面受力分析可知，梅花形密排床面的颗粒起动水流拖曳力为矩形密排床面的73.82%,因此相同水流条件下梅花形密排床面的簇群运动更剧烈，较难形成稳定阶段。研究成果为理解推移质簇群演变机理提供了理论基础，也为山区河流微地貌变化与水流条件响应量化关系研究提供了参考。
Abstract：Bedload clusters, as the important component of the microtopographic structure in mountain rivers, significantly affect bedload transport, bed surface resistance, and riverbed shaping. This study investigates the evolution processes of bedload clusters and quantifies the relationship between cluster evolution and flow intensity under two different particle arrangements on the river bed through open-channel flume experiments with changing flow conditions. The experimental results indicate that the probability density distribution of cluster formation quantity is closely related to water flow intensity, and there are differences in the characteristic parameters of cluster evolution process under different river bed arrangements. Under the rectangular river bed arrangement, there are clear flow intensity thresholds for the formation, stability, and disintegration stages of clusters. Through force analysis on the contact surface between particles and the bed surface, it is known that the starting flow drag force of particles on the quincuncial bed surface is 73.82% of that on the rectangular river bed arrangement. Therefore, under the same flow conditions, cluster movement on the quincuncial bed is more intense and a stable stage is harder to form. The research results provide a theoretical basis for understanding the evolution mechanism of bedload clusters, and also provide a reference for quantifying the relationship between micro geomorphological changes and flow conditions in mountainous rivers.
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基本信息:
DOI：10.16239/j.cnki.0468-155x.2026.01.003
中图分类号:TV142.2
引用信息:
[1]肖毅,尹思琪,邓敬宏,等.山区河流推移质簇群形成及演变特征试验研究[J].泥沙研究,2026,51(01):16-22.DOI:10.16239/j.cnki.0468-155x.2026.01.003.
基金信息:
国家自然科学基金项目(52179059)
2025-12-15
2025-12-15
2025-12-15