Influence of Headcut Height on the Developmental Processes of Gully Bed Plunge Pool on a Granite Red Soil Slope

WANG Jianyu; LIN Zhe; LIAO Dalan; DUAN Xiaoqian; DENG Yusong

doi:10.13870/j.cnki.stbcxb.2024.03.035

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Influence of Headcut Height on the Developmental Processes of Gully Bed Plunge Pool on a Granite Red Soil Slope

更新时间：2025-03-12

- Influence of Headcut Height on the Developmental Processes of Gully Bed Plunge Pool on a Granite Red Soil Slope
- Vol. 38, Issue 3, Pages: 1-11(2024)
- 作者机构：
  
  1. 广西大学林学院,南宁,530004
  2. 广西大学农学院,南宁,530004
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.03.035
  CLC： S157.1
- Published：2024
- 稿件说明：
移动端阅览
WANG Jianyu, LIN Zhe, LIAO Dalan, et al. Influence of Headcut Height on the Developmental Processes of Gully Bed Plunge Pool on a Granite Red Soil Slope[J]. 2024, 38(3): 1-11.
DOI：

WANG Jianyu, LIN Zhe, LIAO Dalan, et al. Influence of Headcut Height on the Developmental Processes of Gully Bed Plunge Pool on a Granite Red Soil Slope[J]. 2024, 38(3): 1-11. DOI： 10.13870/j.cnki.stbcxb.2024.03.035.

摘要

[目的] 为明确花岗岩红壤坡面沟头溯源侵蚀的关键过程及形成机制。[方法] 通过设定5个沟头高度(25

100

125 cm)研究花岗岩红壤坡面沟床跌穴发育过程。[结果] (1)随沟头高度增加

沟床径流雷诺数、径流剪切力、径流功率和射流参数(触底流速、射流剪切应力、瞬时动能、跌穴径流能耗)均表现为增加趋势。(2)红土层沟床形成“V”形跌穴

随流量增加跌穴形态变化增大

但只形成面积较小的跌穴。而砂土层在冲刷过程中

沟床跌穴发育较为明显

当流量增大到120 L/min后

沟床破碎化程度增加

跌穴轮廓逐渐清晰

横截面积增大。(3)通过随机森林算法和沙普利值构建并表征模型各参数的关系

红土层沟床径流的弗罗德数、径流功率、水平出射动能、雷诺数与横截面积呈负相关;砂土层沟床径流的弗罗德数和跌穴径流能耗与横截面积呈负相关。沟床跌穴侵蚀程度可用随机森林算法构建模型预测(LCCC=1.02

R2adjusted=0.876和0.868)。[结论] 研究结果可为揭示沟头溯源侵蚀机理和沟蚀防治提供理论依据。

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

100 and 125 cm). [Results] (1) As the height of the headcut increased

the Re

ω and the jet parameters (Vbottom

τmax

EKbottom

and ΔEH) 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

EKbrink

and Re were negatively correlated with the cross-sectional area; and in the sandy soil layer

Fr and ΔEH were negatively correlated with the cross-sectional area. Higher accuracy of predictive models constructed by the random forest algorithm (LCCC=1.02

R2adjusted=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

Keywords

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