NDLI: Experimental investigation of channel flow through idealized isolated tree-like vegetation

Content Provider	Springer Nature Link
Author	Kitsikoudis, Vasileios Yagci, Oral Kirca, V. S. Ozgur Kellecioglu, Dorukhan
Copyright Year	2016
Abstract	Riparian and floodplain tree-like emergent vegetation alter significantly the flow field and lead to complicated three-dimensional flow patterns, characterized by increased turbulence production, with the potential to induce morphological changes. The canopy presence in tree-like vegetation leads to the formation of lee wake vortices and can induce a strong subcanopy flow. The present experimental study employs artificial, rigid, tree-like emergent vegetation elements, with relatively simple structure, in order to investigate the canopy effects on the flow field. Specifically, the tree-like canopy is simulated by placing an element on top of a wooden rod simulating the trunk. Three elements with an equal encircling diameter of 16 cm are examined as canopy in tree-like vegetation, namely a circular cylinder and two hexagonal arrays comprising smaller circular cylinders with two different individual diameters. The experiments were conducted in a 26 m long laboratory flume and the velocity measurements were carried out with an acoustic Doppler velocimeter. The results show that the canopy porosity has a direct impact on the subcanopy flow intensity and on the required distance that the flow needs to recover. In addition, the subcanopy flow disrupts the formation of a steady wake region behind the entire porous element and inhibits the development of a recognizable von Karman vortex street.
Starting Page	1283
Ending Page	1308
Page Count	26
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	16
Issue Number	6
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-10-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Emergent vegetation Experimental hydraulics Flow-vegetation interaction Open channel hydraulics Subcanopy flow Tree-like vegetation Earth Sciences Environmental Physics Hydrology/Water Resources Classical Mechanics Hydrogeology Oceanography
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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