Open AccessHydraulic resistance due to unsteady ow in river channels: numerical simulation results
Author(s) -
Tatyana Dyakonova,
Anna Klikunova,
А. В. Хоперсков
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1400/7/077041
Subject(s) - hydraulic resistance , laminar flow , channel (broadcasting) , geology , mechanics , computer simulation , geotechnical engineering , vortex , hydrology (agriculture) , environmental science , physics , engineering , electrical engineering
The hydraulic resistance to ow in a river-type channel is due to the action of a large number of factors. We created numerical models of unsteady water dynamics in an inhomogeneous channel by varying its geometric and hydraulic characteristics. We focused on the study of ows at small values of the Manning roughness coefficient, when the water movement is unsteady. The transitional regime from a pulsating ow to a laminar ow is characterized by a complex system of large vortices covering the entire channel. The nonstationarity factor enhances the hydrological resistance to ow, and thus provides an additional contribution to the effective Manning coefficient.