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Effect of slope borders in reducing splash erosion during sediment transport by rain-induced overland flow
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2023-03-17 , DOI: 10.1111/ejss.13360
Lin Liu, Yi Zhang, Zhongwu Li, Fei Xu, Qinghui Zhang

Splash erosion plays a vital role in the loss of eroded materials. Unlike those in slope central areas, laterally ejected splashed materials in slope border areas cannot be replenished easily because slope edges prevent splash erosion particles from entering the slope. Thus, splashed materials in slope border areas are less than those in slope central areas because of the lack of source areas for splash-eroded materials. However, this phenomenon, called the slope border effect, has received minimal attention by researchers. The partially missing splash erosion induced by the slope border effect on sediment transport was investigated to understand the slope erosion mechanism further in this paper. A modified soil pan divided into four areas, namely, central erosion test area (length = 100 cm, width = 35 cm, depth = 45 cm), border erosion test area (length = 100 cm, width = 35 cm, depth = 45 cm), splash compensate border area (length = 110 cm, width = 30 cm, depth = 45 cm) and splash collection area (length = 100 cm, width = 2.5 cm, depth = 45 cm) was used to monitor diffusion and splash erosion under simulated rainfall. Results showed that the splash detachment rate increased with the increase in slope but initially decreased and then increased with the increase in rainfall intensity. The runoff rate and diffuse erosion rates for complete splash erosion (SE) treatments were higher than those without partial splash erosion (SEL). Under low rainfall erosive power and runoff transport capacity (e.g., 5° slope and 60 mm h−1), the transported clay in SE treatments was approximately 2% more than that in SEL treatments. This amount changed to more than 2% sand under high rainfall and runoff erosive power. However, the mass fraction accounted for by silt particles in the sediments of the SEL treatments was more than that in the SE treatments. Thus, the partially missing splash erosion can weaken the selective transport ability of runoff for sediments. The effect of missing partial splash erosion on diffuse erosion was enhanced with an increase in erosive power. The results of our paper will provide insights into the effect of the boundary effect zone of slope on soil erosion and its related mechanisms.

中文翻译:

边坡边界在减少降雨引起的地表漫流输沙过程中的飞溅侵蚀中的作用

飞溅侵蚀在侵蚀材料的损失中起着至关重要的作用。与斜坡中心区域不同,斜坡边缘区域横向喷射的溅射材料不易得到补充,因为斜坡边缘阻止了溅蚀颗粒进入斜坡。因此,由于缺乏溅蚀物质的源区,边坡区的溅射物质少于坡中区。然而,这种称为斜坡边界效应的现象很少受到研究人员的关注。为了进一步了解边坡侵蚀机理,研究了边坡边界效应对输沙作用引起的部分缺失的飞溅侵蚀。改造后的土盘分为四个区域,即中央侵蚀试验区(长=100厘米,宽=35厘米,深=45厘米),边界侵蚀测试区(长度 = 100 厘米,宽度 = 35 厘米,深度 = 45 厘米),飞溅补偿边界区域(长度 = 110 厘米,宽度 = 30 厘米,深度 = 45 厘米)和飞溅收集区(长度 = 100 厘米) ,宽度 = 2.5 厘米,深度 = 45 厘米)用于监测模拟降雨下的扩散和飞溅侵蚀。结果表明,飞溅脱落率随着坡度的增加而增加,但随着降雨强度的增加先降低后增加。完全飞溅侵蚀的径流率和扩散侵蚀率(结果表明,飞溅脱落率随着坡度的增加而增加,但随着降雨强度的增加先降低后增加。完全飞溅侵蚀的径流率和扩散侵蚀率(结果表明,飞溅脱落率随着坡度的增加而增加,但随着降雨强度的增加先降低后增加。完全飞溅侵蚀的径流率和扩散侵蚀率(SE ) 处理高于没有部分飞溅侵蚀 ( SE L ) 的处理。在低降雨侵蚀力和径流输送能力(例如,5° 坡度和 60 mm h -1 )下, SE处理中输送的粘土比SE L处理多约 2% 。在高降雨量和径流侵蚀力下,这个量变成了 2% 以上的沙子。然而, SE L处理的沉积物中泥沙颗粒所占的质量分数高于SE治疗。因此,部分缺失的溅蚀会削弱径流对泥沙的选择性输运能力。随着侵蚀力的增加,缺失部分飞溅侵蚀对漫侵蚀的影响增强。我们的论文结果将有助于深入了解边坡边界效应带对土壤侵蚀的影响及其相关机制。
更新日期:2023-03-17
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