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We study the exponential stability for the $C^1$ norm of general 2×2 1-D quasilinear hyperbolic systems with source terms and boundary controls. When the eigenvalues of the system have the same sign, any nonuniform steady-state can be stabilized using boundary feedbacks that only depend on measurements at the boundaries and we give explicit conditions on the gain of the feedback. In other cases, we exhibit a simple numerical criterion for the existence of basic $C^1$ Lyapunov function, a natural candidate for a Lyapunov function to ensure exponential stability for the $C^1$ norm. We show that, under a simple condition on the source term, the existence of a basic $C^1$ (or $C^p$ , for any $p ≥ 1$) Lyapunov function is equivalent to the existence of a basic $H^2$ (or $H^q$ , for any $q ≥ 2$) Lyapunov function, its analogue for the $H^2$ norm. Finally, we apply these results to the nonlinear Saint-Venant equations. We show in particular that in the subcritical regime, when the slope is larger than the friction, the system can always be stabilized in the $C^1$ norm using static boundary feedbacks depending only on measurements of at the boundaries, which has a large practical interest in hydraulic and engineering applications.

On boundary stability of inhomogeneous 2 × 2 1-D hyperbolic systems for the C1 norm

On boundary stability of inhomogeneous 2 × 2 1-D hyperbolic systems for the C¹ norm