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s
Determination of parameters in the Zhang Ruijin’ formula for sediment-transport capacity
in low sediment-laden flows and its application in the Jingjiang Reach

ZHOU Meirong，XIA Junqiang，DENG Shanshan，LIU Xin
（State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan 430072，China）

Abstract：The selection of the formula for sediment-transport capacity and the determination of its parame⁃
ters directly affect the simulation accuracy of morphodynamic models. In the rivers with low sediment con⁃
centration， Zhang Ruijin's formula is more applicable to calculate the sediment-transport capacity. Howev⁃
er，the parameters k and m in the Zhang's formula have different values in various studies with many un⁃
certainties. Therefore，573 sets of data were selected in the Middle Yangtze River （MYR） at a quasi-equi⁃
librium stage， which were used to calculate the sediment-transport capacity. Then the relationship between
the sediment-transport capacity and the comprehensive flow-sediment parameter was plotted，with the calcu⁃
lation formulas for parameters k and m being proposed. Finally， the improved calculation formula of sedi⁃
ment-transport capacity was embedded in a one-dimensional morphodynamic model to simulate the process⁃
es of flow and sediment transport in the Jingjiang Reach of the MYR in 2016. The results show that when
the parameters of Zhang's formula were determined by calculation formulas， the average relative errors
（MREs） of the calculated and measured sediment concentrations at the hydrometric stations were between
26% and 36%；when these parameters were taken as constants，the values of MREs were in the range of
39% - 49% . Therefore， the simulation accuracy of sediment transport was improved when the calculation
formula was adopted to determine the parameters of Zhang's formula. In summary， the calculation formulas
of parameters can enable the model to adjust the parameters of Zhang's formula based on the actual flow
and sediment conditions，which helps to improve the adaptability of morphodynamic models applied to natu⁃
ral rivers.
Keywords： low sediment concentration； quasi-equilibrium stage； sediment-transport capacity； determination
of parameters；Jingjiang Reach

（责任编辑：李福田）

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