Abstract
Studying open channel flow and sediment transport in narrow flumes under non-uniform flow conditions, both sidewall and non-uniformity corrections are required for bed-shear stress. This research first reviews conventional predictive methods for bed-shear stress, including the flow-depth method, the hydraulic radius method and Einstein's sidewall correction. It then presents a novel procedure for sidewall and non-uniformity corrections based on a recent cross-sectional velocity distribution model. These methods are compared with data from the log-law under uniform and non-uniform, sub- and supercritical flow conditions, indicating that (i) the flow-depth and the hydraulic radius methods specify the upper and lower bounds for bed-shear stress; (ii) although Einstein's procedure causes a paradox for smooth flumes, it agrees with data from rough beds; and (iii) the proposed is better than Einstein's for subcritical flow, but the latter has advantage for supercritical flow. As an application, sediment inception under non-uniform flow conditions is also discussed.
Original language | English (US) |
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Pages (from-to) | 218-229 |
Number of pages | 12 |
Journal | Journal of Hydraulic Research |
Volume | 53 |
Issue number | 2 |
DOIs | |
State | Published - Mar 4 2015 |
Keywords
- Bed-shear stress
- Einstein's procedure
- flume experiment
- non-uniform flow
- sidewall correction
ASJC Scopus subject areas
- Civil and Structural Engineering
- Water Science and Technology