State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, People's Republic of China.
Institute of Soil and Water Conservation of Chinese Academy of Sciences and Ministry of Water Resources, Yangling, 712100, People's Republic of China.
Sci Rep. 2017 May 24;7(1):2350. doi: 10.1038/s41598-017-02565-8.
Previous research on sediment transport capacity has been inadequate and incomplete in describing the detachment and transport process of concentrated flows on slope farmlands during rill development. An indoor concentrated flow scouring experiment was carried out on steep loessial soil slope with erodible bed to investigate the sediment transport capacity under different flow rates and slope gradients. The results indicated that the sediment transport capacity increases with increasing flow rate and slope gradient, and these relationships can be described by power functions and exponential functions, respectively. Multivariate, nonlinear regression analysis showed that sediment transport capacity was more sensitive to slope gradient than to flow rate, and it was more sensitive to unit discharge per unit width than to slope gradient for sediment transport capacity in this study. When similar soil was used, the results were similar to those of previous research conducted under both erodible and non-erodible bed conditions. However, the equation derived from previous research under non-erodible bed conditions with for river bed sand tends to overestimate sediment transport capacity in our experiment.
先前关于输沙能力的研究在描述坡面农田细沟发育过程中集中水流的分离和输移过程方面不够充分和完整。在具有可蚀性床面的陡峭黄土斜坡上进行了室内集中水流冲刷试验，以研究不同流速和坡度条件下的输沙能力。结果表明，输沙能力随流速和坡度的增加而增加，这两个关系可以分别用幂函数和指数函数来描述。多元非线性回归分析表明，输沙能力对坡度的敏感性大于流速，对单位流量比坡度更敏感。在本研究中，输沙能力受单位流量比坡度更敏感。当使用类似的土壤时，结果与先前在可蚀性和不可蚀性床面条件下进行的研究相似。然而，由先前在不可蚀性床面条件下用河流床沙推导的公式在本实验中往往会高估输沙能力。
