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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Flow analysis around submerged vegetation
Flow analysis around submerged vegetation
Author : THOKCHOM BEBINA DEVI(1) & BIMLESH KUMAR(2)
ABSTRACT
The present study highlights the flow characteristics around vegetation. Laboratory experiments were conducted in a
17.24 m long glass-sided tilting flume. Acoustic Doppler Velocimeter (ADV) was used for velocity measurements.
Vegetation was simulated by flexible rubber cylinders of 10 mm diameter and 8 cm height above the sand bed.
Vegetation was arranged in a uniform pattern in a 5 m long test section. Experiments for two different vegetation
spacing, 15 cm and 10 cm, were conducted. Different velocity profiles were plotted for different measuring positions
around vegetation along a section. From the results it is drawn that velocity is reduced in front of the vegetation as
compared to other measuring positions. But the velocity gradient is more in this location due to which more shear stress
is achieved here. Thus, Reynolds stress profiles were also plotted. The maximum Reynolds stress for all the locations is
found near the top of the vegetation because of the drag imposed by the vegetation stems irrespective of the vegetation
spacing. Quadrant analysis was carried out for explaining the different events of bursting phenomenon at each location.
It is shown that stress contribution is mainly from ejection and sweep events as compared to other events.
File Size : 1,431,696 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 19/08/2015
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