文章摘要
周苍宁, 王清震, 唐恺, 叶志鑫, 冯家伟, 梁心蓝.紫色土坡耕地不同微地形地表汇流网络特征[J].水土保持学报,2022,36(2):146~152
紫色土坡耕地不同微地形地表汇流网络特征
Characteristics of Surface Confluence Network in Different Micro-topography Types of Purple Soil Slope Farmland
投稿时间:2021-09-18  
DOI:10.13870/j.cnki.stbcxb.2022.02.019
中文关键词: 凹陷  凸起  微地形  紫色土  汇流网络
英文关键词: depression  mound  micro-topography  purple soil  confluence network
基金项目:国家自然科学青年基金项目(41601292);四川省教育厅项目(15ZB0007);四川农业大学社科研究专项重点项目(2018ZD01)
作者单位E-mail
周苍宁, 王清震, 唐恺, 叶志鑫, 冯家伟, 梁心蓝 四川农业大学水利水电学院, 四川 雅安 625014 liangxinlan@sicau.edu.cn 
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中文摘要:
      为了揭示不同微地形汇流网络的特征,通过野外人工降雨模拟试验,结合近景摄影测量技术,在相同降雨历时下,提取并分析了60,90,120 mm/h雨强下,连续凹陷、间隔凹陷、连续凸起、间隔凸起、凹凸相连、凹凸相间以及对照组7种微地形措施的汇流网络。结果表明:(1)7种微地形的汇流密度随集水面积阈值的增大而逐渐减小,间隔凹陷和凹凸相连的最佳阈值为450 m2,对照组、连续凹陷和间隔凸起的最佳阈值为550 m2,连续凸起和凹凸相间的最佳阈值为650 m2;(2)对照组、连续凹陷和间隔凹陷的汇流形态为树枝状,间隔凸起和凹凸相间的汇流形态为既有树枝状也有平行状的混合状,连续凸起和凹凸相连的汇流形态为平行状;在微地形中凹陷起着汇集径流、减少低级径流数量的作用,而凸起则是起着改变径流流向、降低径流汇合几率的作用;(3)7种微地形的汇流密度和径流频度表现为树枝状>混合状>平行状,随着降雨强度的增大各措施的汇流密度无显著变化,但径流频度则随着降雨强度的增大总体呈现增大的趋势。
英文摘要:
      In order to reveal the characteristics of confluence network of different micro-topography types, field artificial rainfall simulation experiments were conducted. The confluence networks of seven micro-topography types were abstracted and analyzed by close-range photogrammetry. The rainfall events with 60, 90 and 120 mm/h rainfall intensity lasted for 90 minutes. The seven micro-topography types were continuous depressions, alternate depressions, continuous mounds, alternate mounds, continuous mounds and depressions, alternate mounds and depressions, and smooth slope. The results showed that:(1) The drainage density gradually decreased with the increasing of drainage area threshold. The optimal thresholds for alternate depressions and continuous mounds and depressions were 450 m2, those for smooth slope, continuous depressions and alternate mounds were 550 m2, and those for continuous mounds and alternate mounds and depressions were 650 m2. (2) The morphology of confluence network of the control group, continuous depressions and alternate depressions was dendritic pattern. The confluence network of alternate mounds and alternate mounds and depressions was mixed pattern, which was a mixture of dendritic pattern and parallel pattern. The confluence network of continuous mounds and continuous mounds and depressions was parallel pattern. In the micro-topography, depression played a role in collecting runoff and reducing the amount of low-level runoff, while the mound played a role in changing runoff direction and reducing convergence possibility of runoff. (3) The drainage density and stream frequency of the seven micro-topography types followed the order of dendritic pattern>mixed pattern>parallel pattern. With the rainfall intensity increased, the stream frequency generally increased while the drainage density changed only a little.
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