Feedback between vegetation, flow, and deposition: A study of artificial vegetation patch development
2021
Yamasaki, Taís N. | Jiang, Beihan | Janzen, Johannes G. | Nepf, Heidi M.
Laboratory experiments examined how the hydrodynamic interaction between neighboring patches of model vegetation impacted deposition and the potential for patch expansion. The evolution of the vegetated region was modeled experimentally by introducing new artificial vegetation into regions of enhanced deposition. The study began with a pair of side-by-side, circular patches, each of diameter D = 10.5 cm, constructed from circular cylinders (d = 3.2 mm) that extended through the flow depth. The interaction between the patches generated a zone of enhanced deposition on the centerline between the patches, and this zone had a much greater longitudinal extent than the region of enhanced deposition formed behind an individual patch. This suggested that the interaction between patches could enhance streamwise growth. In addition, deposition on the centerline eventually led to the merger of the two adjacent patches, a mechanism for lateral patch growth. Finally, regions of diminished velocity on the outside edge of the patch pair were observed to enhance deposition over a lateral distance of 0.5D. These observations of lateral growth stand in contrast to previous descriptions of vegetation-flow interaction that emphasize negative feedbacks for lateral growth and positive feedbacks only for streamwise growth. Although lateral growth was observed, the tendency for enhanced deposition (growth) extended much farther in the streamwise direction (40D) than in the lateral direction (0.5D), such that vegetation expansion was dominated by streamwise growth.
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