期刊
JOURNAL OF HYDRAULIC RESEARCH
卷 53, 期 2, 页码 218-229出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00221686.2014.971449
关键词
non-uniform flow; Bed-shear stress; flume experiment; sidewall correction; Einstein's procedure
资金
- US FHWA Hydraulics R&D Program through the Genex System [DTFH61-11D-00010]
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.
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