A hybrid‐3D hillslope hydrological model for use in Earth system models

摘要: Hillslope-scale rainfall-runoff processes leading to a fast catchment response are not explicitly included in land surface models (LSMs) for use earth system (ESMs) due computational constraints. This study presents hybrid-3D hillslope hydrological model (h3D) that couples 1-D vertical soil column with lateral pseudo-2D saturated zone and overland flow ESMs. By representing responses separately at different spatial resolutions, h3D is computationally efficient. The was first tested three planforms (uniform, convergent divergent). We then compared (with single multiple columns) complex physically based 3-D simple moisture coupled an unconfined aquifer (as typically used LSMs). It found simulations obtained by the vary considerably from able represent hillslope-scale variations response. In contrast, shows much better performance saves time 2-3 orders of magnitude model. When columns implemented, resulting (soil moisture, water table depth, base along hillslope) nearly identical those predicted model, but still time. As such, efficiency provides valuable promising approach incorporating into continental global-scale