A posteriori error estimates for the Richards equation
![](https://project.inria.fr/gatipor/files/2021/12/a_post_Rich_thmb-250x101.png)
Main results: nonlinear advection–reaction–diffusion equation; parabolic–hyperbolic and parabolic–elliptic degeneracies; a posteriori error estimates: guaranteed upper bound in nonlocal-in-time (time-integrated) norms; local space–time efficiency in standard norms; the reliability and efficiency norms coincide when there is no nonlinearity; distinction of error components. Details: preprint with Koondanibha Mitra