Vegetation cover effects on sediment concentration and overland flow under artificial rainfall intensity

M. Boussaadi, L. Mouzai
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引用次数: 1

Abstract

Soil erosion depends on a number of factors including rainfall intensity, density of plant cover, and area cover. The objective of this study is to investigate the impact of these factors on flow velocity, overland flow regimes, sediment concentration, and absolute soil detachment. The soil used in this study was sandy remolded agricultural soil. The soil is packed in a tray of 1 m2 fixed on a slope of 3%; five different intensities were simulated under different vegetation cover (density and area). The results indicated that the overland flow velocity with vegetation cover was best described by polynomial function. The mean flow velocity varied from 0.021 to 1.244 m/s. Overland flow regime is subcritical and laminar. However, there are significant relationships between the vegetation cover density and sediment concentration and absolute soil detachment. The sediment concentration ranged from 1.38 to 5.65 kg/m3 whereas the absolute soil detachment ranged from 0.021?10-3 to 1.244?10-3 kg/m2/s. Finally, the vegetation cover presented a good protector to soil sediment from erosion.
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人工降雨强度下植被覆盖对泥沙浓度和坡面流的影响
土壤侵蚀取决于许多因素,包括降雨强度、植被密度和面积覆盖。本研究的目的是研究这些因素对流速、坡面流态、沉积物浓度和绝对土壤剥离的影响。本研究使用的土壤为沙质重塑农业土壤。土壤装在1平方米的托盘中,固定在3%的坡度上;在不同植被覆盖(密度和面积)条件下,模拟了5种不同的强度。结果表明,植被覆盖下的坡面流速度最好用多项式函数来描述。平均流速为0.021 ~ 1.244 m/s。坡面流型为亚临界流和层流。植被覆盖密度、底泥浓度与土壤绝对剥离呈显著相关。沉积物浓度范围为1.38 ~ 5.65 kg/m3,土壤绝对分离范围为0.021?10-3到1.244?三分kg / m2 / s。植被覆盖对土壤沉积物具有良好的保护作用。
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来源期刊
CiteScore
2.00
自引率
16.70%
发文量
16
审稿时长
12 weeks
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