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New developments in predicting stage–discharge curves, velocity and boundary shear stress distributions in open channel flow
Author(s) -
Omran Mazen
Publication year - 2008
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2007.00091.x
Subject(s) - open channel flow , overbank , shear stress , mechanics , flow (mathematics) , stage (stratigraphy) , channel (broadcasting) , geology , shear velocity , boundary (topology) , geotechnical engineering , mathematics , mathematical analysis , engineering , turbulence , physics , geomorphology , fluvial , paleontology , structural basin , electrical engineering
The stage–discharge curve, depth‐averaged velocity and boundary shear stress distributions are required to be determined for flood alleviation schemes. These parameters are hard to predict because of the three‐dimensional (3‐D) aspects of flow in open channels. This paper proposes a new approach for modelling open channel flow based on the Shiono and Knight Method (SKM), which is a depth‐averaged model based on the governing Navier–Stokes equations. The modelling philosophy is applied to natural rivers and artificial channels both in inbank and overbank flow conditions. Accurate results are obtained when compared with field data and experimental measurements. Modelling philosophies are presented for the three calibration coefficients of the SKM. These coefficients represent the most important features of the 3‐D flow mechanism.