What is "HexWatershed"?
HexWatershed is a hydrologic routing model based on the hexagon mesh framework.
Why do we develop HexWatershed?
Spatial discretization is the cornerstone of all spatially-distributed numerical simulations including watershed hydrology. Traditional square grid spatial discretization has several limitations:
It cannot represent adjacency uniformly;
It leads to the "island effect" and the diagonal travel path issue in D8 scheme;
It cannot provide a spherical coverage without significant spatial distortion.
Therefore, we developed a watershed delineation model (HexWatershed) based on the hexagon grid spatial discretization.
We propose that spatially distributed hydrologic simulations should consider using a hexagon grid spatial discretization.
How we did it?
We basically rewrote all the core watershed delineation algorithms, just on a completely different data structure.
What is the current status of "HexWatershed"?
We are finalizing a few core components in the HexWatershed ecosystem:
A special designed resampling tool for HexWatershed will be available soon;
HexWatershed is ready for continental and global scale simulation;
HexWatershed is supporting MPAS mesh;
We are evaluating hydrology simulations using HexWatershed routing maps.