Wind-Driven Flow of Water Influenced by a Canopy

by Robert O. Reid, Prof.; Dept. of Oceanography, Texas A & M Univ., College Station, Tex.,
Robert E. Whitaker, Research Assoc.; Dept. of Oceanography, Texas A & M Univ., College Station, Tex.,

Serial Information: Journal of the Waterways, Harbors and Coastal Engineering Division, 1976, Vol. 102, Issue 1, Pg. 61-77

Document Type: Journal Paper


A time-dependent numerical model, which treats fully evolved wind-driven canopy flow as a coupled two-layer system, is developed. The interfacial stress is formulated in terms of a coupling coefficient and the flow differential. The resistance afforded by a vegetative canopy is parameterized in terms of a drag coefficient and dimensional properties of the canopy elements. With flow confined strictly to the canopy, the calming effect of the canopy is introduced through a sheltering coefficient. The canopy is modeled as a set of rigid uniform structures orientated normal to the flow and evenly distributed with specified density over the bottom. The algorithm is tested by simulating the steady-state water-surface profiles observed in a laboratory channel containing wire screen obstructions. The model is applied next to a wind-driven rectangular basin with simulated vegetation specified over half the bottom.

Subject Headings: Numerical models | Wind engineering | Water flow | Canopies | Coupling | Vegetation | Simulation models | Hydrologic models

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