水土保持学报2025，Vol.39Issue(5)：92-104,13.DOI:10.13870/j.cnki.stbcxb.2025.05.036
工程堆积体坡面侵蚀过程及水动力指标对入流形式的响应
Response of Erosion Processes and Hydrodynamic Indicators to Inflow Patterns on Engineering Accumulation Slopes
摘要
Abstract
[Objective]To reveal the effects of different inflow patterns on slope erosion,sediment yield,and their hydrodynamic characteristics.[Methods]Based on simulated inflow scouring experiments,two inflow patterns(concentrated flow and sheet flow)and three flow rates(4,8,and 12 L/min)were designed to investigate the response mechanisms of slope erosion processes to inflow patterns.[Results]1)Under concentrated flow and sheet flow,the slope runoff and sediment yield processes were basically consistent.The runoff yield process shifted abruptly and then stabilized,while the sediment yield process showed an initial rapid decline and then diminished with fluctuations.Compared with sheet flow,the soil erosion rate under concentrated flow exhibited stronger fluctuations,with coefficients of variation ranging from 71.49％to 111.94％.2)The average flow velocity on the slope under concentrated flow was significantly higher than that under sheet flow(p<0.05),with differences ranging from 28.15％to 52.85％.3)Under both concentrated flow and sheet flow,the slope flow types were consistent,both showing the coexistence of transitional flow and turbulent flow.However,significant differences existed in the slope flow regimes:concentrated flow showed supercritical flow,while sheet flow showed subcritical flow.4)Under both inflow patterns,soil erosion rates were extremely significantly positively correlated(p<0.01)with Reynolds number,resistance coefficient,runoff shear stress,stream power,and runoff unit energy.However,the optimal hydrodynamic indicators differed:stream power(R2=0.68)for sheet flow and runoff shear stress(R2=0.80)for concentrated flow.5)Compared with sheet flow,the slope soil erodibility indices(Kτ,Kω,and Kε)under concentrated flow increased by 166.67％,81.25％,and 113.86％,respectively,and the corresponding critical hydrodynamic thresholds(τ0,ω0,ε0)increased by 19.78％,40.70％,and 42.11％,respectively.[Conclusion]Concentrated flow shows stronger turbulence and higher erosion energy,leading to severe soil erosion.These findings help reveal the influencing mechanisms of inflow patterns on slope erosion processes and provide a crucial theoretical basis for developing slope erosion prediction models under different inflow patterns.关键词
入流形式/股流/面流/水动力学参数/工程堆积体/土壤侵蚀Key words
inflow patterns/concentrated flow/sheet flow/hydrodynamic parameters/engineering accumulation/soil erosion分类
农业科技引用本文复制引用
陈岳岩,马宝红,栾新龙,魏晓兰,吴旭,牛耀彬..工程堆积体坡面侵蚀过程及水动力指标对入流形式的响应[J].水土保持学报,2025,39(5):92-104,13.基金项目
国家自然科学基金项目(42207397) （42207397）
山西省基础研究计划青年项目(20210302124074,20210302124373) （20210302124074,20210302124373）
