TREND ANALYSIS OF LONG-TERM RADAR RAIN GUAGES DATA AND ITS APPLICABILITY TO RIVER PLANNING IN KANTO AREA, JAPAN

Abstract

 The results of the trend analysis of the GPV and AMeDAS data showed that the daily rainfall differed by rainfall rank. The results of the trend analysis of GPV and AMeDAS showed that the trend of daily rainfall was different for each rainfall rank. The results of the trend analysis of GPV and AMeDAS showed that the daily rainfall differed by class, while the hourly rainfall and 10-minutes rainfall did not differ by rainfall rank, indicating that the trend analysis of AMeDAS results as a representative of Thiessen dominated area should be performed with caution. Furthermore, the applicability of radar rain gauges to river planning was examined by comparing summer maximum basin mean rainfall data from GPV and AMeDAS for each year. As a result, it was found that the distributions of GPV and AMeDAS were generally similar, and it was evaluated that the radar rain gauges could be applied to river design planning.