Flow Resistance and Velocity Structure in Shallow Lakes with Flexible Vegetation under Surface Shear Action
Publication: Journal of Hydraulic Engineering
Volume 139, Issue 6
Abstract
This study was conducted to investigate the flow restructure and resistance in vegetal flow under wind shear action in shallow lakes. A special racetrack-style flume with two sets of driving devices installed on the top was designed to simulate the wind-driven current. Two typical types of live vegetation, Vallisneria natans and Acorus calamus of Taihu Lake in China, were planted in the system. The results revealed that the velocity distribution of vegetal flow under wind action differed from that in open channels. The velocity distribution can be described as logarithmic-curve shaped and contained a compensation current in the lower layer. The area within the effective height of vegetation in which the velocity was obviously affected comprised an effective friction region. When compared with V. natans, A. calamus displayed better resisting capacity. Based on measured data, a new empirical relationship between drag coefficient and wind speed was presented, which indicated the resistance ability of vegetation under different intensities of wind action. Variations in the equivalent roughness coefficient were also discussed.
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Acknowledgments
This work was partly supported by the National Basic Research Program of China (973Program) (Grant No. 2008CB418202), Major Science and Technology Program for Water Pollution Control and Treatment (2012ZX07103-005), the National Natural Science Foundation of China (Grant Nos. 51179052, 51009048, 50979026), National Key Technologies R&D Program Of China (2012BAB03B04) and the Project of Six Talent Peak of Jiangsu Province (08-C).
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 139 • Issue 6 • June 2013
Pages: 612 - 620
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 18, 2012
Accepted: Nov 19, 2012
Published online: Nov 21, 2012
Published in print: Jun 1, 2013
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