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The rheology of granular particles in an inclined plane geometry is studiedusing molecular dynamics simulations. The flow--no-flow boundary is determinedfor piles of varying heights over a range of inclination angles $\theta$. Threeangles determine the phase diagram: $\theta_{r}$, the angle of repose, is theangle at which a flowing system comes to rest; $\theta_{m}$, the maximum angleof stability, is the inclination required to induce flow in a static system;and $\theta_{max}$ is the maximum angle for which stable, steady state flow isobserved. In the stable flow region $\theta_{r}<\theta<\theta_{max}$, threeflow regimes can be distinguished that depend on how close $\theta$ is to$\theta_{r}$: i) $\theta>>\theta_{r}$: Bagnold rheology, characterized by amean particle velocity $v_{x}$ in the direction of flow that scales as$v_{x}\propto h^{3/2}$, for a pile of height $h$, ii)$\theta\gtrsim\theta_{r}$: the slow flow regime, characterized by a linearvelocity profile with depth, and iii) $\theta\approx\theta_{r}$: avalanche flowcharacterized by a slow underlying creep motion combined with occasional freesurface events and large energy fluctuations. We also probe the physics of theinitiation and cessation of flow. The results are compared to several recentexperimental studies on chute flows and suggest that differences betweenmeasured velocity profiles in these experiments may simply be a consequence ofhow far the system is from jamming.Comment: 19 pages, 14 figs, submitted to Physics of Fluid

Granular flow down a rough inclined plane: Transition between thin and thick piles