| 陈培济,黄炎和,蒋芳市,林金石,詹振芝,胡安东,黄清瑜,申芳芳,陈泽文.集中水流冲刷条件下土石崩积混合物坡面产沙特征[J].水土保持学报,2016,(3): |
| 集中水流冲刷条件下土石崩积混合物坡面产沙特征 |
| Feature of Sediment Yield on Soil-rock Mixed Colluvial Soil Slope under Concentrated Flow |
| 投稿时间：2016-01-06 修订日期：2016-03-06 |
| DOI： |
| 中文关键词: 崩岗崩积体 土石混合物 集中水流 土壤侵蚀 |
| 英文关键词: colluvial soil soil-rock mixture concentrated flow soil erosion |
| 基金项目:国家自然科学基金项目；国家科技支撑计划项目 |
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| 中文摘要: |
| 通过室内人工放水冲刷试验，探究不同流量（2 L/min、4 L/min、8 L/min、16 L/min）和砾石含量（0%、20%、40%、60%）条件之下土石崩积混合物坡面产沙特征。结果表明：各条件下产沙过程均呈“先增大后减小再趋于稳定”的趋势。产沙量随着流量的增大而增大，而含沙量随流量的增大总体呈减小的趋势；在2 L/min和4 L/min条件下，产沙量及含沙量随着砾石含量的增大呈先减小后增大的趋势，存在临界砾石含量（20-40%之间）；在8 L/min和16 L/min条件下，产沙量及含沙量随着砾石含量的增大而增大。产沙率与含沙量的关系表明含石量对产沙的影响存在临界含石量（20% - 40%）。砾石含量和流量可以用来很好地预测土石崩积混合物的产沙率，但对含沙量的预测效果较差。流量对产沙率及含沙量的影响均大于砾石含量。 |
| 英文摘要: |
| The soil-rock mixed colluvial slope was selected to study the feature of sediment yield that was affected by four gravel contents(0%，20%，40%，60%) and four discharges(2 L/min ，4 L/min，8 L/min，16 L/min) in indoor artificial runoff experimental condition．The results showed that: the process of sediment yield indicated that the sediment yield overall increased first, and then decreased, reached a steady finally with erosion duration. Sediment volume increased with increasing discharge, whereas sediment concentration decreased with increasing discharge; sediment volume and sediment concentration firstly decreased and then increased with increasing gravel content at the discharges of 2 L/min and 4 L/min, existing critical gravel content (20% - 40%), but sediment yield and sediment concentration increased with increasing gravel content at the discharges of 8 L/min and 16 L/min. According to the relationship between sediment yield rate and sediment concentration, it was indicated that the effect of gravel content on sediment yield existed critical gravel content (20% - 40%). Gravel content and discharge could be used to predict sediment yield rate of soil-gravel mixed colluvial slope correctly, but prediction for sediment concentration was poorer. The effects of discharge were higher than gravel content. |
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