泥沙研究2025，Vol.50Issue(6)：9-15,29,8.DOI:10.16239/j.cnki.0468-155x.2025.06.002
冰盖流泥沙起动规律研究
Study on incipient motion of sediment in ice-covered flow
摘要
Abstract
In cold regions,ice cover or even ice jam frequently occurs in river during winter,which signifi-cantly altering flow conditions and complicating sediment initiation mechanisms.Based on Einstein's division hypothesis of flow resistance and adopting an exponential velocity distribution formula,a unified sediment in-cipient velocity formula for open channel flow,ice-covered flow and ice-jammed flow under diverse roughness combinations is established and validated with experimental data.The results show that calculated sediment incipient velocities by the proposed formula agree well with experimental data,the average relative error re-duces to 4.256％after considering the different sediment motion incipient criteria under different experimental conditions,compared that of 7.245％to 10％calculated by conventional formulas in the literature.The incipi-ent flow velocity for sediment motion in open channel flow is greater than that in ice-covered flow,and the lat-ter is greater than that in ice-jammed flow.The maximum incipient sediment particle size under varying bound-ary conditions ranks as:ice-jammed flow＞ice-covered flow＞open channel flow.关键词
明渠流/冰盖流/冰塞流/糙率/泥沙起动流速/最大可起动粒径Key words
open channel flow/ice-covered flow/ice jam flow/roughness/incipient velocity/maximum incipi-ent particle size分类
建筑与水利引用本文复制引用
许晓阳,王平,陈月君,胡恬..冰盖流泥沙起动规律研究[J].泥沙研究,2025,50(6):9-15,29,8.基金项目
河南省重大科技专项(231100320100) （231100320100）
广西重点研发计划项目(2023AB24010036) （2023AB24010036）
中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2023-18) （HKY-JBYW-2023-18）
