水保所知识产出(1956---)知识库

Purpose The sediment transport capacity provides a theoretical basis for accurate prediction of soil erosion. The aim of this
study is to develop a sediment transport capacity prediction model applicable to a variety of soils.
Materials and methods Sandy loess and loess soil (d 50 = 0.095 mm and d 50 ’ = 0.04 mm) were used to conduct indoor sediment
transport experiments under different hydraulic conditions. Moreover, the experimental data of cohesive soil and cohesionless
sand was combined, and the response relationship between sediment transport capacity and each flow intensity parameter
was analyzed through dimensionless processing.
Results and discussion Results showed that the sediment transport capacity had an exponential function relationship with
unit discharges and energy slopes. The sediment transport capacity also varied with the changing flow intensity parameters,
and through analysis, the effective stream power was observed as an optimum predictor (R 2 = 0.9692). Considering the
effective stream power and volumetric sediment concentration, this study derived a formula for calculating the sediment
transport capacity.
Conclusions In conclusion, this study innovatively established a prediction model of sediment transport capacity on loessial
slopes though regression analysis and dimensionless method. The proposed model is capable of considering flow intensities
and volumetric sediment concentration simultaneously, and has a superior applicability to both cohesive soil and cohesion-
less sand compared with the four main existing models.