Analysis of X-band Multi Parameter Radar at mountainous areas for quantitative utilization

Abstract

X-band Multi Parameter Radar enables to obtain detailed and various parameters to estimation of rainfall amount. It is expected to contribute to real time observation of localized heavy rainfall and disaster reduction. However, large errors in rainfall estimation have been reported over distant mountainous regions in Yamanashi because the radar beams are blocked by mountains and attenuated by strong rainfall. In this study, estimated rainfall using X-band Multi Parameter radar of University of Yamanashi was compared with rain gauge data provided by Japan Meteorological Agency and Yamanashi prefecture. Comparisons were carried out for stratiform rainfall, convective rainfall and typhoon case. As a result, the estimation accuracy was clearly different by rainfall type. And in the stratiform rainfall case, estimation accuracy was high even over the distant area from the Radar site.