IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Composite Roughness of Ice-covered Flows in Open Channels
Composite Roughness of Ice-covered Flows in Open Channels
Author : Kailin Yang, Hui Fu, Xinlei Guo, Tao Wang and Yongxin Guo
The composite roughness of ice covered flows is a key parameter to determine the relationship between the flow and water stage. This paper presents a generalized formula for the composite roughness by analyzing the relationship among the roughness coefficients, the cross-sectional average velocities and wetted perimeters. Based on the generalized formula, the effect of the distribution of the velocities both in the bed region and in the ice region on the composite roughness of the ice covered flows in rectangular channels is studied. Meanwhile, in order to understand the scope of application to them, Einstein?s formula, Belokon - Sabaneev formula and Larsen?s formula are compared with the generalized formula systematically. The results show that Einstein?s formula is the best approximation of the generalized formula, and both the Sabaneev formula and Larsen?s formula may result in a great deviation in many cases.
File Size : 271,152 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Article : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT
Date Published : 18/07/2016
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