Chapter
Jul 8, 2013
Transverse Mixing Coefficient on Dunes with Vegetation on a Channel Wall
Authors: S. H. Tabatabaei [email protected], M. Heidarpour [email protected], M. Ghasemi [email protected], and E. Z. Hoseinipour [email protected]Author Affiliations
Publication: World Environmental and Water Resources Congress 2013: Showcasing the Future
Abstract
Studding of contamination and water mixing is important for rivers management. Beds form as dunes and vegetation affect the advection process. The main objective of this research was investigation of transverse mixing coefficient (TMC) and dominant factors on the coefficient simulated in a river containing vegetated walls. Experimental measurements were made over 5-10 dunes in a series of 10 of two-dimensional asymmetric gravel dunes. Experiments were carried out in a flume with a 20 m long, 0.6 m wide, and 0.6 m deep. The dunes had an angle of lee slope of 28°, a mean wave length of 1 m, and mean height of 0.08 m. Three flow depths of 280, 330, and 360 mm were used for evaluation of aspect ratio. The result shows that interaction of vegetation and dunes can increase mixing of contaminant and TMC 3.19 times on flatbed. Investigation of flow structure shows that influencing factors on TMC in this case are intensity of turbulence, shear velocity, and secondary flows.
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© 2013 American Society of Civil Engineers.
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Published online: Jul 8, 2013
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Aff.M.ASCE
Associate Professor, Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran. E-mail: [email protected]
Professor, Department of Water Engineering, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran. E-mail: [email protected]
Graduated student, Department of Water Engineering, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran. E-mail: [email protected]
Engineering Manager, Water Resources Ventura County Watershed Protection District (WPD), California, USA. E-mail: [email protected]
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