Effects of sediment characteristics on the sediment transport capacity of overland flow
作者机构：Institute of Soil and Water ConservationNorthwest A&F UniversityYanglingShaanxi712100PR China State Key Laboratory of SoilErosion and Dryland Farming on the Loess PlateauInstitute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourceYanglingShaanxi712100PR China Beijing Key Laboratory of Environmental Remote Sensing and Digital CityFaculty of Geographical ScienceBejing Normal UniversityBejing100875PR China
出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)
年 卷 期：2023年第11卷第1期
页 面：75-85页
核心收录：
学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0815[工学-水利工程] 081502[工学-水力学及河流动力学] 0903[农学-农业资源与环境]
基 金：funded by the National Natural Science Foundation of China(42177308 42130701).
主 题：Sediment transport capacity Soil mechanical composition Soil aggregates Sediment settling velocity Dimensional analysis
摘 要：The transport of sediments is a crucial part of soil erosion.Accurately calculating the sediment transport capacity is key to the construction of soil erosion process models.Research on Tc has focused mainly on the dynamics of a single particle of sediment and hydraulic variables.There have been few studies of the impact of soil aggregates on the Tc.To clarify how sediment characteristics,including those for single particles and aggregates,affect the Tc of overland flow with no raindrop import,flume experiments were implemented at slope gradients varying from 5.24%to 26.80%and flow discharges ranging from 0.68 to 5.41×10^(-3)m^(2)s^(-1).The experimental materials were five typical soils in China.The results indicated that the correlation between the measured Tc and sediment mechanical composition indexes of the five soils was indistinctive in this study.The sediment settling velocity with aggregates has a significant corre-lation with the measured Tc.New equations,including for the sediment settling velocity with aggregatesωud75,were established to calculate the Tc.The empirical equation that includedωud75,slope gradient and unit discharge performed greatly in predicting Tc(R^(2)=0.93,NSE=0.90).ωud75 can effectively improve the calculation accuracy of Tc.The new equation including flow and sediment properties obtained through dimensional analysis performed well in predicting Tc(R^(2)=0.99,NSE=0.91),and the calculation accuracy was better than that of the empirical model derived in this study.These findings indicate that the sediment settling velocity is an important variable in the equation for predicting sediment transport capacity of overland flow.
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