Wataru MIYAZAKI
Verification of Accuracy and Availability on Observed Solid Precipitation Amount with Precipitation Gauge or Weather Radar
Toshiro KUMAKURA
Horizontal distribution of solid precipitation derived from weather radar which is corrected with ground observation of precipitation is useful to prevent snow disasters.
It is thought that there are two problems to obtain accurate or available distribution. First, the precipitation gauge measurements are not accurate because of wind blowing resulting from under-catch of the precipitation. Second, beam of the weather radar is blocked by surrounding mountains and the beam intensity is attenuated by the heavy precipitation.
Then, we attempt to correct the precipitation amount observed with the automated weather stations equipped with/without wind shields, and to obtain the areas blocked by the topography and the precipitation areas assumed that the winter-averaged cloud distribution is nearly equal to the precipitation distribution.
Our correcting method using information of the types of the precipitation gauges leads the result of 30%-40% difference compared with the not informed results.
On the other hand, it is found that there are not any areas blocked by the topography only, but we find the areas, which exist in larger than 1000m, blocked by the topography and the precipitation areas.
Finally, we calculate the precipitation distribution from the weather radar corrected with the ground-observed precipitation masked with the blocked area by the topography and the winter-averaged precipitation
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