水土保持学报2024，Vol.38Issue(3)：1-11,11.DOI:10.13870/j.cnki.stbcxb.2024.03.035
花岗岩红壤坡面沟头高度对沟床跌穴发育过程的影响
Influence of Headcut Height on the Developmental Processes of Gully Bed Plunge Pool on a Granite Red Soil Slope
摘要
Abstract
[Objective]Headcut bed plunge pool point development is a key process in headcut erosion on granitic red soil slopes,but the mechanism of its formation is not clear.[Methods]We investigated the process of gully bed plunge pool development on granite red soil slopes by setting five headcut heights(25,50,75,100 and 125 cm).[Results](1)As the height of the headcut increased,the Re,r,ω and the jet parameters(Vbottom,τmax,EKbottom,and △EH)showed an increasing trend.(2)After the laterite soil layer scouring to form a"V"type of small plunge pool,with the increase in the flow of the form of plunge pool gradually increased,but it is difficult to form a large area of the plunge pool,and the laterite soil layer is more stable than the sandy soil layer.During the scouring process of the sandy soil layer,the development of headcut bed drop points was more obvious,and when the flow rate increased to 120 L/min,the degree of gully bed fragmentation was gradually drastic,and the outline of the drop points was gradually clearer,and the cross-sectional area increased.(3)The random forest algorithm and Shapley values were used to construct the model and characterize the relationship between the parameters.The results showed that in the laterite layer,Fr,ω,EKbrink,and Re were negatively correlated with the cross-sectional area;and in the sandy soil layer,Fr and △EH were negatively correlated with the cross-sectional area.Higher accuracy of predictive models constructed by the random forest algorithm(LCCC=1.02,R2djusted=0.876 and 0.868).[Conclusion]The results of the study can provide a theoretical basis for revealing the mechanisms of headcut erosion and gully erosion control.关键词
花岗岩红壤/沟床跌穴/水力参数/形态演变Key words
granite red soil/plunge pool/hydraulic parameters/morphological evolution分类
农业科技引用本文复制引用
王建羽,林哲,廖达兰,段晓倩,邓羽松..花岗岩红壤坡面沟头高度对沟床跌穴发育过程的影响[J].水土保持学报,2024,38(3):1-11,11.基金项目
国家自然科学基金项目(42107350) （42107350）
中央引导地方科技发展资金项目(桂科ZY21195022) （桂科ZY21195022）
