Mana HONDA

Development of a Practical Distributed Hydrological Modeling System Corresponding to High Resolution Geographical Information

Mianjio LU

The objective of this study is to develop a practical distributed hydrological modeling system corresponding to high resolution geographical information. This study includes three parts. The first is to make GUI-based(Graphical User Interface) program to calculate radiation from AMeDAS data. The second is develop a new GUI-based channel network delineation program. The last one is to make proto-type GUI-based distributed model.
In the first part, A GUI-based program makes it possible to select AMeDAS station from a visual map, and to calculate radiation from all about 1300 stations on the Japan islands.

In the second part, besides the GUI program, new algorithm are introduced to avoid the effects of the digitizing error of the basin boundary and river lines from topographical maps. This makes it very easy to delineate digital channel network from digital geographical information such as DEM.
In the third part, a prototype distributed hydrological model that incorporates snowmelt process, rainfall runoff process and river routing process is developed.
The newly developed system is applied to the Yagisawa Dam basin. It is shown this makes it very easy to construct a distributed model even for a beginner.