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• W2783228943 abstract "As a critical parameter of the steady uniform friction model, the roughness coefficient changes with flow unsteadiness in flood events; i.e., the flow conditions of the stream segment significantly affect the flow resistance. In this study, a modified formula was established to improve the unsteady friction simulation; ten terms relating to the first- and second-order time and space partial derivatives of hydraulic parameters were selected as additional terms. The results of a hydraulic experiment show that the hysteresis between flow depth and mean cross-sectional velocity cannot be neglected in unsteady flows that disturb the performance of a steady uniform friction model. Six terms have a strong correlation with objective friction. Further, three of them have a small variance in correlation coefficient. Then, the composition of the proposed formula was determined. The results show that adding too many additional terms provides better performance in the calibration phase, yet reduces the accuracy of the validation phase because of an overfitting phenomenon. The optimal number of additional terms is three, and the established formula can improve the unsteady friction simulation." @default.
• W2783228943 created "2018-01-26" @default.
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• W2783228943 date "2018-01-08" @default.
• W2783228943 modified "2023-09-25" @default.
• W2783228943 title "A Hydraulic Friction Model for One-Dimensional Unsteady Channel Flows with Experimental Demonstration" @default.
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• W2783228943 doi "https://doi.org/10.3390/w10010043" @default.
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