Figure 1.

Schematic of the domain used in the simulations. The steady-state horizontal velocity profile $\overline{u}(z)$ is imposed as the velocity inlet boundary condition. A conformal map accounts for variations in h and $h_g$ to separate the overflow (where $\mathbf{F}=\mathbf{0}$, in blue) and seagrass (where $\mathbf{F}\ne \mathbf{0}$, in green) regions of the domain. Buoyant grass blades deform by the flow, apply a drag $\mathbf{F}$ on the fluid, and the composite tip positions determine $h_g$.