hs1D is a hillslope flow and transport model based on Boussinesq equations. You can download it from the GitHub repository here.

hs1D has been successfully applied to Brittany watersheds for eutrophication problems.

hs1D is currently been applied for layered aquifers where connectivity of shallower flowpaths is enhanced by the wetness of the deeper compartment.

A transit time based reactivity framework is developed to model reactive transport at the hillslope scale. In streams solute time series are being used to infer the interplay of key hydrological and weathering processes at the hillslope scale.