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A zero-flux principle for extracting secondary flows in arbitrary vertical planes of naturalrivers

Journal of Hydrodynamics 2022年第4期34卷 744-755页

作者： De-chao Hu Department of Hydraulic Engineering Yangtze River Scientific Research InstituteWuhan 430010China School of Civil and Hydraulic Engineering Huazhong Univ.of Science and TechnologyWuhan 430074China

The cross-sectional transverse flow field(represented by u_(con),)of rivers comprises a convective part(represented by ucon)and a circulatory part(represented by ueire),and a zero-flux principle of the ucire has been known for a long ***,it is still difficult to separate the circulatory part from the convective part quantitatively in a 3-D velocity field,for an arbitrarily vertical plane in natura ivers of iregular shape this study,a ero-flux prineiple of the uis derived,o replace th old zero-fux principle of the ueire:.Based on the new principle,an all-purpose new method is proposed for extracting the circulations in arbitrary vertical planes of natural rivers of irregular *** calculation with the new method requires only the distribution of the horizontal velocities of a single vertical line(VL),and is *** calculation can be made based on either the velocity field simulated by a 3-D hydrodynamic model or the field measurements obtained by the acacoustic Doppler velocimetry(ADV).The new method is validated by using the field data of the lower Yangtze *** extracted circulations are reasonable,while the results of the circulation extraction,respectively,based on the velocity field of a 3-D model and the field measurements of the ADV,are shown to be *** capability of the method is also demonstrated,using the typical riverbends of the Yangtze River as examples.

关键词： Real river cross-sectional secondary flow circulation extraction zero-flux principle

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