ИСТИНА

Global small-scale hydrological modeling datasets are needful component of Earth system models. These datasets typically include flow direction and flow accumulation models. Regardless of the method of obtaining global hydrological product, one will face the task of processing at least continent-scale datasets, which may be time-consuming or hardware-expensive. Hexagonal mesh grid computations have shown better performance than rectangular ones, boosting interest in global-scale simulations on hexagonal grids. There are studies where hydrological modelling is successfully applied on hexagonal discrete global grid systems (DGGS), although locally. This research presents an algorithm for parallel computation of flow directions on the hexagonal DGGS. Referring to the hierarchical nature of DGGS, we cut the study area into tiles along one of the small-scale levels cells boundaries. Hydrological modeling is then performed on the desired level child cells of each tile. Afterwards the results are stitched into a single coverage.