Waving marine grass

Mon, 04 Jan 2016 06:08:23 +0000

I bet you have seen gusts of wind exciting synchronized waves on the surface of tall grass field just like observed on the beach.

Linear stability analysis for monami in a submerged seagrass bed

Sun, 10 Jan 2016 00:00:00 +0000

The onset of monami – the synchronous waving of seagrass beds driven by a steady flow – is modelled as a linear instability of the flow. Unlike previous works, our model considers the drag exerted by the grass in establishing the steady flow profile, and in damping out perturbations to it. We find two distinct modes of instability, which we label modes 1 and 2. Mode 1 is closely related to Kelvin–Helmholtz instability modified by vegetation drag, whereas mode 2 is unrelated to Kelvin–Helmholtz instability and arises from an interaction between the flow in the vegetated and unvegetated layers.

Environment on Shreyas Mandre

Waving marine grass

Linear stability analysis for monami in a submerged seagrass bed