抄録
This study analyzed the spatial representativeness of heavy rain and the capture performance of heavy rain observed by the rain gauges installed discretely at 347 sites in Kanto Plain and 287 sites in the mountainous area of Koshin-etsu region. The spatial representativeness is evaluated by the percentile of precipitation ratio between two sites. The spatial representativeness of 1-hour precipitation and 24-hours precipitation becomes lower, when the precipitation increases. The spatial representativeness is lower in 1-hour precipitation than in 24-hours precipitation and in the mountainous area than in the plain. The capture performance is evaluated by the capture rate of heavy rain, and relation between the capture rate of heavy rain and distance of two sites is formulated. The capture rate of 1-hour precipitation and 24-hour precipitation becomes lower, when threshold of heavy rain increases. The capture rate is lower in 24-hours precipitation than in 1-hour precipitation and in the mountain area than in the plain.
