水土保持研究2026，Vol.33Issue(1)：54-62,70,10.DOI:10.13869/j.cnki.rswc.2026.01.013
冻融作用对WEPP模型细沟可蚀性参数的影响
Effect of freeze-thaw cycles on rill erodibility parameters in WEPP model
摘要
Abstract
[Objective]This study investigates the effects of freeze-thaw cycles on the rill erodibility parameters estimated by the Water Erosion Prediction Project(WEPP)model,aiming to provide a scientific basis for improving the model′s accuracy in predicting erosion in seasonal freeze-thaw regions.[Methods]Agricultural soil from a typical black soil region in Northeast China was selected as the research object.Different water discharge rates(1,2,3 L/min),number of freeze-thaw cycles(0,1,3,5,10 cycles),and initial soil moisture contents(16.5%,24.8%,and 33.0%by mass)were set.Laboratory simulated scouring experiments under controlled conditions were conducted to investigate the combined effects of freeze-thaw cycles and initial soil moisture on rill erosion rates and erodibility variations.Additionally,the reliability of the WEPP model′s rill erodibility parameters under freeze-thaw cycles was evaluated based on measured critical shear stress.[Results](1)Both the number of freeze-thaw cycles and initial soil moisture content significantly influenced rill erosion rates(p<0.01).As the number of freeze-thaw cycles and initial soil moisture content increased,the rill erosion rate progressively increased,with the greatest increase observed after the first freeze-thaw cycle,followed by stabilization after 3～5 cycles.Moreover,an increase in initial soil moisture content intensified the effect of freeze-thaw cycles on the erosion rate.(2)The average rill erodibility of black soil was 3.6×10⁻3 s/m,which increased by 1.84 times under freeze-thaw cycles.Under unfrozen conditions,the WEPP model demonstrated satisfactory fitting performance.However,under freeze-thaw cycles,the model generally overestimated critical shear stress,with an average overestimation of 58.59%.[Conclusion]Freeze-thaw cycles significantly increase rill erosion rates and erodibility,with higher initial soil moisture content intensifying these effects.Furthermore,the WEPP model demonstrates increased uncertainty in estimating erodibility parameters under freeze-thaw cycles.关键词
临界剪切力/冻融循环作用/初始土壤含水量/WEPP模型/细沟可蚀性Key words
critical shear stress/freeze-thaw cycles/initial soil moisture content/WEPP model/rill erodibility分类
农业科技引用本文复制引用
Zhang Zhiyi,Wang Bin,Wang Wengang,Liu Yicheng,Zhou Xiao..冻融作用对WEPP模型细沟可蚀性参数的影响[J].水土保持研究,2026,33(1):54-62,70,10.基金项目
国家自然科学基金项目"复杂界面冻融—融雪—渗流多场耦合驱动的黑土区沟道侵蚀动力机制"(42477338) （42477338）
