泥沙研究2025，Vol.50Issue(4)：30-36,58,8.DOI:10.16239/j.cnki.0468-155x.2025.04.005
基于分形理论的冰下非黏性泥沙起动流速研究
Study on the incipient velocity of non-cohesive sediment under ice cover based on fractal theory
摘要
Abstract
The presence of ice cover significantly alters river hydraulic conditions,leading to unique riverbed evolution phenomena.Understanding the incipient velocity of sediment under ice cover is crucial for studying sediment transport and riverbed erosion-deposition mechanisms during ice periods.Based on Einstein's resistance partition principle and fractal theory,the relationship between sediment incipient velocity in the open channel and under ice cover is established.A two-power-law function is derived to calculate the incipient velocity of non-cohesive sediment under ice,which is validated by field prototype experiments,furthermore.The research results indicate that the vertical distribution of flow velocity in the riverbed area under ice cover exhibits fractal characteristics,the derived formula shows a high fitting degree with experimental data,with an average relative error of 6.67％.It performs better in predicting the incipient velocity of coarser sediment particles,improving accuracy by 8％compared to the Mazipu formula.Additionally,field prototype tests reveal that sediment in ice-jammed river sections is more easily mobilized,and the riverbed cross-section demonstrates the characteristic of"reduced ice jams,increased sedimentation".关键词
非黏性泥沙/起动流速/分形理论/双幂律函数/河床冲淤/冰塞Key words
non-cohesive sediment/incipient velocity/fractal theory/two-power-law function/riverbed erosion and deposition/ice jam分类
建筑与水利引用本文复制引用
陈子健,罗红春,冀鸿兰,李志军..基于分形理论的冰下非黏性泥沙起动流速研究[J].泥沙研究,2025,50(4):30-36,58,8.基金项目
国家自然科学基金联合基金项目(U23A2012) （U23A2012）
国家自然科学基金项目(52379014) （52379014）
内蒙古自然科学基金青年基金项目(2023QN05026) （2023QN05026）
内蒙古自治区教育厅一流学科科研专项项目(YLXKZX-NND-010) （YLXKZX-NND-010）
