Effects of cross-sectional geometry on sediment transport ratio: Case study in the Lower Yellow River

Sediment transport ratio fitted by measured data indicates a closely relation with average discharge and suspended sediment concentration. However, theoretical speaking, the cross-sectional geometry may also influence the sediment transport. In present study, numerical simulation is adopted to analyze the influence of cross-sectional geometry on sediment transport ratio. Two flood events occurred in 1977 were simulated by onedimensional model for unsteady hyper-concentrated sediment-laden flow. Analysis indicates that, the crosssectional formation during flood events may also contribute to sediment transport ratio. Besides, over-flooding hyper-concentrated flood followed by normal one may lead to larger sediment transport ratio