水土保持学报2026，Vol.40Issue(1)：89-98,109,11.DOI:10.13870/j.cnki.stbcxb.2026.01.038
冻融作用下高寒土细沟侵蚀过程与输沙能力经验模型
Empirical Model of Rill Erosion Processes and Sediment Transport Capacity in Alpine Soil under Freeze-Thaw Action
摘要
Abstract
[Objective]This study aims to investigate the mechanisms by which freeze-thaw action affects rill erosion.[Methods]Laboratory flume scouring experiments were conducted to analyze rill sediment transport characteristics under different combinations of flow rate(q)and slope gradient(S),and sediment transport capacity factor models were constructed.[Results]1)Freeze-thaw action increased the sediment transport capacity of rills by up to 34.34%,with a pronounced dependence on slope gradient and flow rate.Additionally,it shortened the critical slope length from 6.8～8.1 m to 5.3～6.4 m.2)The sediment transport capacity maintained a linear relationship with flow rate(Tc=Aq)both before and after freeze-thaw processes,while its relationship with slope changed.Before freeze-thaw,it increased exponentially with slope(Tc=-ae(-S/b)+c),while after freeze-thaw,it followed a power-law growth(Tc=d Sf).The established models,Tc=-0.041 4+0.110 1S+192.5q before freeze-thaw and Tc=-0.039 8+0.107 7S+213.2q after freeze-thaw,exhibited high accuracy(R²=0.96).The changes in these coefficients indicated that the influence of flow rate on sediment transport capacity increased while that of slope decreased after freeze-thaw.[Conclusions]Overall,freeze-thaw action alters soil structure,enhances the sediment transport capacity of rills,and modifies the slope response relationship.Model comparisons indicate that freeze-thaw action,soil bulk density,soil type,and experimental settings all affect the prediction performance of the models.These findings provide important theoretical support for soil erosion prediction and control in alpine regions.关键词
冻融作用/细沟侵蚀/输沙能力/预测模型Key words
freeze-thaw action/rill erosion/sediment transport capacity/prediction model分类
农业科技引用本文复制引用
田方霄,周金龙,郝宇东,赵鸿博,万丹..冻融作用下高寒土细沟侵蚀过程与输沙能力经验模型[J].水土保持学报,2026,40(1):89-98,109,11.基金项目
国家自然科学基金项目(32241036) （32241036）
西藏农牧大学林学博士点(一期)项目(533325001) （一期）
西藏农牧大学研究生创新计划项目(YJS-2024-37) （YJS-2024-37）
