Journal
WATER
Volume 14, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/w14162530
Keywords
apparent shear stress; bank shear stress; bed shear stress; boundary shear stress; composite roughness; flow region division
Categories
Funding
- National Nature Science Foundation of China [51409132]
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The article introduces a new method for estimating the distribution of boundary shear stress based on the concept of standardized cross-sections and an assumption of equal local-region velocity. Comparisons with other methods prove its better prediction performance.
The estimation of boundary shear stress distribution in a channel is a challenge in some hydraulic or environment investigations. A new partition model of a trapezoidal cross-section in a prismatic channel with composite roughness has been introduced based on a concept of a standardized cross-section using the zero-shear stress division lines. Based on this new model, an equal local-region velocity assumption, which can be regarded as an improvement of Einstein's (1942) equal velocity assumption, has been proposed that is based on a discussion on the mechanism of energy transfer and velocity distribution at two sides of a dividing line. This assumption along with some empirical treatments have been employed to establish a new method to estimate the boundary shear stress of a side-wall or bed. Comparisons show that the proposed method can be applied to composite roughness cases and provides better prediction performance compared to other methods.
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