DEVELOPMENT OF GROUND RAINFALL ESTIMATION METHOD USING SEEDER-FEEDER MODEL AND RADAR VOLUME SCANNING OBSERVATION

Abstract

 In Japan, there are many steep terrains, and the mountains enhance the rainfall resulting in much of total rainfall amount. Due to the effect of orographic rainfall, there is sometimes a discrepancy between radar-observed rainfall and ground-observed rainfall. Accurate estimation of ground rainfall is very important from the viewpoint of disaster prevention. In this study, in order to improve the accuracy of the ground rainfall estimation, I have developed a method to estimate the capture rate in real time from the radar information, and the values of the capture rate obtained by the method are used for the ground rainfall estimation. As a result, the capture rate was calculated reliably. It is also shown that the method can estimate the ground rainfall with the same or better accuracy than the conventional prediction method, even when using the capture rate obtained from the real-time radar information.