绿肥覆盖柑橘园土壤分离能力对集中流水动力学参数的响应
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西南大学资源环境学院

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S715.1;S157.1

基金项目:

重庆市基础科学与前沿技术研究专项(No. CSTB2023NSCQ-MSX0117)


Response of Soil detachment capacity of Citrus Orchard Covered with Green Fertilizer to Concentrated Hydrodynamic Parameters
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Affiliation:

Southwestern University of resources and environment

Fund Project:

Chongqing Research Program of Basic Research and Frontier Technology(No. CSTB2023NSCQ-MSX0117)

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    摘要:

    [目的]探究三峡库区典型坡地橘园绿肥覆盖土壤分离能力与集中水流水力学特性间的关系,为进一步明晰典型坡地橘园陆上流在土壤侵蚀过程中的水力学特性提供数据支撑。[方法]通过集中流冲刷试验,分析在不同坡度(10°~25°)与流量(18~126L/min)组合的梯度水动力条件下,裸坡与绿肥(白花三叶、早熟禾以及野豌豆)覆盖地的土壤分离量,探讨绿肥覆盖下的土壤分离能力与水流动力参数(水流剪切力、水流功率)、流态流型参数(雷诺数、弗汝德数)、阻力参数(Darcy-Weisbach阻力系数、曼宁系数)的定量关系并建立相应的数学模型。[结果]绿肥覆盖能显著降低土壤分离能力(P < 0.01);裸坡与绿肥覆盖地的土壤分离能力均与水流动力和流态流型参数呈幂函数正相关(P < 0.05),与水流阻力参数呈幂函数负相关(P < 0.05);水流剪切力对土壤分离能力的预测效果好于水流功率;雷诺数预测土壤分离能力的效果比弗汝德数好;Darcy-Weisbach阻力系数的预测效果好于曼宁系数。[结论]总体比较,水流剪切力预测土壤分离能力的效果最好,精度最高(决定系数为0.957,纳什效率系数为0.963)。

    Abstract:

    [Objective]To explore the relationship between the soil detachment capacity of green manure cover and the hydraulic characteristics of concentrated water flow in typical sloping orange orchards in the Three Gorges Reservoir area, so as to provide data support for further clarifying the hydraulic characteristics of land upflow in typical sloping orange orchards during soil erosion. [Methods]Through the concentrated flow erosion test, the soil detachment capacity between bare slope and green manure (Trifolium repens, Poa annuaL, and Vicia sepium L) under the gradient hydrodynamic conditions of different slopes (10°~25°) and flow (18~126L/min) was analyzed, and the soil detachment capacity and water flow dynamic parameters (water flow shear force, water flow power), flow pattern parameters (Reynolds number, Freud number), and resistance parameters (Darcy-Weisbach resistance coefficient, Manning coefficient) and establish a corresponding mathematical model. [Results]The results showed that green manure mulching could significantly reduce soil soil detachment ability (P < 0.01). The soil detachment capacity of bare slope and green manure cover was positively correlated with the parameters of water flow dynamics and flow pattern (P < 0.05), and negatively correlated with the parameters of water flow resistance (P < 0.05). The prediction effect of water flow shear force on soil detachment capacity is better than that of water flow power. The Reynolds number predicts soil detachment capacity better than the Freud number. The prediction of the Darcy-Weisbach drag coefficient is better than that of the Manning coefficient. Overall, the shear force of water flow had the best effect in predicting soil detachment ability and had the highest accuracy (R2=0.957, NSE=0.963).

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  • 收稿日期:2024-02-04
  • 最后修改日期:2024-03-18
  • 录用日期:2024-03-18
  • 在线发布日期: 2024-04-29
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