American Society of Civil Engineers

Dispersion Model for Varying Vertical Shear in Vegetated Channels

by S. Patil, (corresponding author), (Dept. of Biological and Agricultural Engineering, Texas A & M Univ., 2117 TAMU, College Station, TX 77843-2117. E-mail: and V. P. Singh, (Caroline and William N. Lehrer Distinguished Chair in Water Engineering and Professor, Dept. of Biological and Agricultural Engineering and Dept. of Civil and Environmental Engineering, Texas A & M Univ., 2117 TAMU, College Station, TX 77843-2117.)

Journal of Hydraulic Engineering, Vol. 137, No. 10, October 2011, pp. 1293-1297, (doi:

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Document type: Technical Note
Abstract: A dispersion model for a wide range of depthwise vertical shear is derived by using perturbation analysis and power (m) law velocity profile. For m=1, the velocity profile provides linear shear, whereas m>1 provides nonlinear shear, and for m>20, the velocity profile resembles the flow through emergent vegetation. The power law represented parametrically simulates well the complex shear profiles involved in emergent and submerged vegetated flows. The proposed model shows reasonable agreement with past data on vegetated flows for a wide range of nonlinear shear velocities.

ASCE Subject Headings:

Author Keywords:
Shear velocity