Development of a Distributed Snowmelt Analysis System Using AMeDAS Data and Digital Geographic Information

The objective of this study is to develop an distributed snowmelt analysis system using conventional hydrometeorological data. This system consists of two subsystem: one for runoff generation and the other for channel routing. In this system, watershed is devided into grid blocks connected by a channel network which is derived from altitude data at central points of grid blocks. In runoff generation subsystem, the runoff from each grid block is calculated by using a snowmelt model based on radiation budget, and the XinAnJiang rainfall runoff model. The runoff is then routed to the study points using the kinematic wave model in routing subsystem. Sample calculations with respect to the Uono River basin resulted in a good correspondence between predicted and observed hydrographs due to snowmelt.