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Alternative TitleMechanism simulation on soil and water conservation of slope farmland side ditch
蔡雄飞1,2,3; 雷丽1; 梁萍1; 傅斌2,3; 王济1; 徐佩2,3; 王玉宽2,3
Source Publication中国水土保持科学
Contribution Rank2
Abstract坡耕地边沟(简称地边沟)我国南方丘陵区坡面水系工程措施体系的重要措施之一,在坡耕地的保护与治理中发挥了重要的作用。为了探讨地边沟的水土保持机制,选取了典型紫色土分布区盐亭、遂宁的4个野外试验点,通过野外调查、大田人工模拟降雨试验等方法,开展了11场模拟试验。结果表明: 1)地边沟具有很好的减流作用,减流率在14.08% ~ 36.72%之间,平均24.7%;随着降雨强度的增大,减流率减小,耕地土壤厚度是影响地边沟减流效果的主要因素。2)地边沟具有很好的减沙作用,减沙率在31.93% ~ 64.95%之间,平均50.08%,随着降雨强度的增大,减沙率增大。3)由于地边沟对泥沙的沉积作用,B小区(试验小区)输移泥沙中黏粒和细粉粒率比A小区(对比试验小区)平均增加12.85%,而粗粉粒及以上颗粒比A小区平均减少40.21%。地边沟减沙作用随降雨强度的增大而更加显著,比较适合于我国南方降水丰富的丘陵地区。
Other Abstract[Background] Slope farmland side ditch ( SFSD) is one of important slope water system engineering measures in the hilly region of southern China,and plays an important role in the protection and management of sloping farmland. This work aims to explore the mechanism of soil and water conservation on SFSD. [Methods]Four field experimental areas from the typical purple soil distribution in Yanting county and Suining city,Sichuan province were selected,in each area 2 plots ( plot A and plot B) were set up. By investigation and artificial simulated rainfall experiment ( 3 rainfall intensities 20 mm/h,55.48 mm/h,and 110.95 mm/h. Rainfall duration was 40 min ) in field,11 simulation experiments were conducted. After the rainfall began,the runoff generation time of plot A and plot B were recorded respectively,and then one runoff sample was collected every interval of 4 ~ 5 min and brought back to the laboratory for analysis and test. After each rainfall,the collector trough in area A was washed,pictures were taken,the sediment in the gutter in area B were measured and removed. [Results]1) The SFSD had the remarkable capacity for runoff reduction,the runoff reduction rate ranged from 14.08% to 36.72%,and the average value was 24.7%,the runoff reduction rate decreased with the increase of rainfall intensities,soil thickness of sloping farmland was the main factor that affected runoff reduction effect of SFSD. 2) The SFSD had the remarkable capacity for sediment reduction,the sediment reduction rate ranged from 31.93% to 64.95%,and the average value was 50.08%,the sediment reduction rate increased with increase of rainfall intensities. 3) Due to sedimentation influence of SFSD to sediment,the clay and fine particle rate of transporting sediment in plot B ( test plot) increased 12.85% on average in comparison with plot A ( comparative test plot),while coarse silt and above particles in plot B ( test plot ) decreased 40.21% on average in comparison with plot A. [Conclusions] The sediment reduction effect of SFSD increases with increase of rainfall intensities, indicating that SFSD is suitable for hilly areas with abundant precipitation in southern China.
Keyword坡地边沟 水土保持机制 坡耕地
Indexed ByCSCD
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Document Type期刊论文
Corresponding Author雷丽
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
蔡雄飞,雷丽,梁萍,等. 坡耕地边沟水土保持机制模拟研究[J]. 中国水土保持科学,2019,17(4):41-48.
APA 蔡雄飞.,雷丽.,梁萍.,傅斌.,王济.,...&王玉宽.(2019).坡耕地边沟水土保持机制模拟研究.中国水土保持科学,17(4),41-48.
MLA 蔡雄飞,et al."坡耕地边沟水土保持机制模拟研究".中国水土保持科学 17.4(2019):41-48.
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