Abstract
Abstract. On the Chinese Loess Plateau many hydraulic parameters related to soil erosion are highly variable and often cross-correlated. Hillslope-gully side erosion systems are widespread on the Loess Plateau, but the quantification between the hydraulic parameters is still unknown for the system. A constant headwater scouring experiment in the laboratory was performed in this study and combined a model with two slope segments (with hillslope and gully sides). Five inflow rates of 6, 8, 10, 12 and 14 L/min were used. Some hydraulic parameters (the flow velocity, shear stress, unit stream power, Reynolds Number, Froude Number, Darcy-Weisbach friction factor, and Manning coefficient) were analysed. Regression equations were developed for the parameters. The results provide a basis for in-depth research regarding the erosion processes of hillslope-gully side erosion systems.
Highlights
Soil erosion is one of the most severe eco-environmental problems worldwide (Pan and Shangguan, 2006)
The hydrodynamic parameters investigated in this study include the mean flow velocity (V), shear stress (τ), unit stream power (USP), Reynolds number (Re), Froude number (Fr), Darcy-Weisbach friction factor (f), and Manning coefficient (n)
The second procedure was employed in this study, that is, the average flow velocity was measured during each run using the dye-tracing technique with potassium permanganate
Summary
Soil erosion is one of the most severe eco-environmental problems worldwide (Pan and Shangguan, 2006). The sediment yield law controls the source of watershed sediments and restores the ecological environment in areas with soil and water loss. It is important to establish a soil erosion forecast model evaluating the watershed soil and water loss environment and predicting its development. The knowledge about what characteristics these parameters have and how they influence the soil erosion process is still limited, which results in some problems in the Loess Plateau (Gong et al, 2011). The main novelty and contribution of this study lies in the systematic and original integration of the hillslope with the gully side as a whole soil erosion system to determine the characteristics of hydraulic parameters controlling soil erosion processes in Hydrodynamic parameters for hillslope-gully side erosion system in loess landscapes a lab experiment with a simulation model design. The results provide insights to further uncover the real sediment yield law in the Loess Plateau, China
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