Accuracy Check of Radar AMeDAS Precipitation by Water Balance Analysis of the Tedori River Mountainous Basin

Abstract

To date, basin precipitation was estimated by point observation by rain gauge and data processing. However, the observation has shortfalls to be solved in future such as lesser rain gauges in the mountainous area. Radar AMeDAS precipitation currently utilized new method that would be solved the above problems. The research aims to confirm the accuracy of the Radar AMeDAS by water balance analysis of the Tedori River mountainous basin. As a result of the research, assume the estimation of evaporation and discharge observation is accurate, the water balance analysis was indicated that the under estimate about 607mm shortage (the ratio of water balance difference to basin area rainfall is -17.2%) through the entire year but only about 49mm (the ratio of water balance difference to basin area rainfall is 4.7%) over estimate though the summer (June-Oct.). From the above result, we found that the Radar AMeDAS precipitation is accurate for basin precipitation observation, if except the snow falling in winter.