| 坡面降雨径流侵蚀输沙的不平衡特性研究 |
| 周凡凡1; 高建恩1,2,3; 王照润1; 王鹭1; 刘思璇1
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| 2021
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发表期刊 | 水土保持学报
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卷号 | 35期号:6页码:95-100 |
摘要 | 针对降雨和床面大糙度共同作用下坡面降雨径流侵蚀不平衡输沙特性研究薄弱的问题,采用室内模
拟降雨试验的方法,研究不同降雨强度和坡长条件下的坡面降雨径流侵蚀输沙特性。结果表明:( 1 )坡面
为裸坡、坡度为 10° 条件下,径流含沙量随坡长的增加呈增大趋势,当坡长由 1m 增加至 8m 时,同一雨强
下径流含沙量增大 3. 28~7. 15 倍;径流含沙量随雨强的增大而增加,当雨强由 40mm / h 增大至 120mm / h
时,同一坡长下径流含沙量增加 1. 41~2. 97 倍。( 2 )分析降雨径流侵蚀条件下,水动力学参数对坡面径流
挟沙能力的影响发现,水流挟沙能力与流速的3次方成正比,与水力半径和沉速的乘积成反比,得到降雨
条件下的水流挟沙能力计算公式。( 3 )研究坡面降雨径流侵蚀输沙的不平衡特性表明,雨强与恢复饱和系
数之间呈幂函数关系,给出坡面不平衡输沙模型并进行验证,表明该模型可以较好地模拟坡面降雨径流侵
蚀输沙沿程变化。研究结果可为预测坡面径流侵蚀输沙沿程变化及完善坡面径流侵蚀机理提供参考。 |
其他摘要 | In view of the weak research on the unbalanced sediment transport characteristics of rainfall - runoff
erosion under the combined action of rainfall and bed roughness , the variation characteristics of rainfall -
runoff sediment transport under different rainfall intensities and slope lengths were studied by using the
indoor simulated rainfall test.The results showed that :( 1 ) Under the condition that the slope was a bare
slope and the slope was10° , when the slope length increased from 1mto 8m , the sediment concentrations of
runoff increased by 3.
28~7. 15times under the same rainfall intensity.The runoff sediment concentrations
increased with the increase of rainfall intensities.When the rainfall intensities increased from 40 mm / h to
120mm / h , the runoff sediment concentrations increased by 1. 41~2. 97times under the same slope length.
(
2 ) According to the existing formula of sediment carrying capacity of river channel , after analyzing the
influence of rainfall , slope , slope length and other factors on runoff sediment carrying capacity , and based on
the rainfall test data and collected test data , the formula of sediment carrying capacity under rainfall
condition was obtained , which could be applied to the calculation of sediment carrying capacity of overland
flow under rainfall condition. ( 3 ) The influence of rainfall intensity on restoring saturation coefficient was
discussed , and the unbalanced sediment transport model was proposed and verified.The verification results
showed that the model had a good simulation effect on the variation of rainfall runoff sediment concentrationlong the slope.These results could provide reference for predicting
the variation of sediment concentrations
along the slope runoff and improving
the erosion mechanism of thin layer runoff. |
关键词 | 径流含沙量
水流挟沙能力
不平衡输沙
坡长
雨强
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收录类别 | 中文核心期刊要目总览
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语种 | 中文
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文献类型 | 期刊论文
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条目标识符 | sbir.nwafu.edu.cn/handle/361005/10398
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专题 | 水保所知识产出(1956---)
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作者单位 | 1.西北农林科技大学水土保持研究所 2.中国科学院水利部水土保持研究所 3.水利部水土保持生态工程技术研究中心
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推荐引用方式 GB/T 7714 |
周凡凡,高建恩,王照润,等. 坡面降雨径流侵蚀输沙的不平衡特性研究[J]. 水土保持学报,2021,35(6):95-100.
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APA |
周凡凡,高建恩,王照润,王鹭,&刘思璇.(2021).坡面降雨径流侵蚀输沙的不平衡特性研究.水土保持学报,35(6),95-100.
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MLA |
周凡凡,et al."坡面降雨径流侵蚀输沙的不平衡特性研究".水土保持学报 35.6(2021):95-100.
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文件名:
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坡面降雨径流侵蚀输沙的不平衡特性研究_周凡凡.pdf
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Adobe PDF
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