不同雨强条件下坡度对红壤坡面侵蚀的影响

发布时间：2019-07-15 15:19

【摘要】：坡度是红壤坡面侵蚀的重要因子,通过室内模拟降雨试验研究3个降雨强度(1.0,1.5,2.0 mm/min),3个坡度(10°,15°,20°)条件下坡度对红壤坡面产流、产沙过程影响。结果表明:(1)相同雨强下,坡面初始产流时间随坡度增加逐渐缩短,坡度与坡面径流量呈正相关关系;相同坡度下,随雨强增加初始产流时间及坡面径流量差异均减小。(2)坡度对红壤坡面含沙量的影响表现为平均产沙量随坡度增加而增大,其中15°坡度下坡面产沙过程波动较大。(3)坡度对坡面径流量的贡献率在60%以上,而坡度对坡面产沙量贡献率保持在30%左右。通过分析不同降雨条件下坡度对红壤坡面侵蚀过程影响,以期为红壤水土流失地区的水土保持预测与措施布没提供相应理论参考。
[Abstract]:Slope is an important factor of red soil slope erosion. The effects of three rainfall intensities (1.0, 1.5, 2.0 mm/min) and 3 slopes (10 掳, 15 掳, 20 掳) on runoff yield and sediment yield on red soil slope were studied by simulated rainfall experiment in laboratory. The results show that: (1) under the same rain intensity, the initial runoff generation time of the slope is gradually shortened with the increase of the slope, and there is a positive correlation between the slope and the runoff of the slope; Under the same slope, the initial runoff yield time and the difference of slope runoff decreased with the increase of rain intensity. (2) the effect of slope on sediment concentration on red soil slope increased with the increase of slope, in which the sediment yield process fluctuated greatly under 15 掳slope. (3) the contribution rate of slope to slope runoff was more than 60%, while the contribution rate of slope to slope sediment yield was about 30%. The influence of slope on the erosion process of red soil slope under different rainfall conditions is analyzed in order to provide the corresponding theoretical reference for the prediction of soil and water conservation and the distribution of measures in the area of soil and water loss in red soil.
【作者单位】：湿润亚热带山地生态国家重点实验室培育基地;福建师范大学地理科学研究所;
【基金】：国家重点研发计划“南方红壤低山丘陵区水土流失综合治理”(2017YFC05054)
【分类号】：S157.1

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