Takahiro MURAKAMI, Toshihiro KIKUI, Hironao SHIMA and Motonari SHIMIZU
Abstract
When we discuss about the rainfall related to occurrence of sediment]related
disaster, it is important to understand the amount of rainfall as accurate as
possible. However, it has not yet defined clearly about the effective area of
rain gauge in case there is no rain gauge near the point sediment]related disaster
occurred, and about the distance from the certain ground]based rain gauge by
which estimation of risk of disaster is possible in case its rainfall exceeds
the standard level. Some reports say about the spatial density distribution
of rain gauges required for understanding the accurate rainfall near the area
disaster occurred.
But rain gauges are not placed spatially uniformly, so the correlations of each
rain gauge depend on the spatial density distribution of them. Furthermore,
it is very difficult to know the deviation between estimated value and true
value by using current rain gauge network. In this paper, we examine the effective
area of ground]based rain gauge around Hakone area in Kanagawa prefecture by
using radar]AMeDAS data which are spatially uniform.
Key wordsFoccurrence rainfall, rain gauge effective area, radar]AMeDAS