Comment on ‘’Groundwater affects the geomorphic and hydrologic
properties of coevolved landscapes” by Litwin et al.
In this comment, we clarify that the specific contributing area is
defined in the limit of an infinitesimal contour length. We also confirm
that not all solutions obtained from the minimalist landscape evolution
model of Bonetti et al. (2020) are rescaled copies of each other because
of the crucial role of the boundary conditions. We use dimensional
analysis and numerical simulations for a case where only one horizontal
length scale enters the physical law to establish this point.