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Influence of surface cover type on sediment transport capacity and sediment retardation benefits based on flume experiments
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.still.2025.106455
Kai Zhang, Ning Li, Suhua Fu, Hongli Mu

Sediment transport capacity (Tc) is a critical parameter in predicting soil erosion, and surface cover has been found to be an effective means for reducing Tc. However, limited research exists regarding the influence of surface cover types on Tc, and the sediment retardation benefits (SRB) of surface cover types are unknown. The aim of this study was to investigate the impact of different surface cover types on Tc and SRB. Therefore, a sets of flume experiment were conducted under controlled conditions, featuring a fixed slope gradient (S = 25.88 %), a constant unit flow discharge (q = 2.70 ×10–3 m2 s–1), and three common types of surface cover commonly found on slope farmland: corn residue, rock fragment, and sweet potato). These experiments also included seven coverage levels (C = 0, 5, 10, 20, 30, 50 and 70 %) with water and sediment samples collected at regular intervals. The results showed that the relative sediment transport capacity (RT) had a negative exponential function with a C under different surface cover types (R2>0.8). Sweet potato exhibited the most effective SRB under the same C. SRB stabilized when the C of different surface cover types reached 30 %. The equations for predicting sediment transport capacity were improved. The results may contribute to the theoretical understanding of sediment transport processes under surface cover conditions and provide a foundation for the informed selection of soil and water conservation measures.

中文翻译:


基于水槽实验的表面覆盖类型对泥沙运移能力和泥沙延迟效益的影响



沉积物输送能力 (Tc) 是预测土壤侵蚀的关键参数,地表覆盖已被发现是减少 Tc 的有效手段。然而,关于表面覆盖类型对 Tc 的影响的研究有限,并且表面覆盖类型的沉积物延迟益处 (SRB) 尚不清楚。本研究的目的是调查不同表面覆盖类型对 Tc 和 SRB 的影响。因此,在受控条件下进行了一组水槽试验,具有固定的坡度梯度 (S = 25.88 %)、恒定的单位流量排放 (q = 2.70 ×10–3 m2 s–1) 以及坡地上常见的三种常见类型的表面覆盖物:玉米渣、岩石碎片和甘薯)。这些实验还包括 7 个覆盖水平 (C = 0、5、10、20、30、50 和 70%),并定期收集水和沉积物样本。结果表明,在不同表层覆盖类型下,相对沉积物输运能力 (RT) 具有负指数函数,值为 C (R2>0.8)。甘薯在相同碳素下表现出最有效的 SRB,当不同表面覆盖类型的碳含量达到 30 % 时,甘薯的 SRB 趋于稳定。预测沉积物运输能力的方程得到了改进。研究结果可能有助于从理论上理解地表覆盖条件下沉积物的迁移过程,并为明智选择水土保持措施提供基础。
更新日期:2025-01-21
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