空間ヴァリオグラムで示唆される一連の豪雨の空間パターンの時間変化

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  • Temporal Change in Spatial Patterns of a Series of Heavy Rain Indicated by Spatial Variograms

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1-h and 10-min rain precipitation data observed in central Japan from noon on the 13th to midnight on the 14th, August 1999 (36 h) have been analyzed in order to find a method indicating any temporal change in spatial rainfall patterns of a series of heavy rain. The analysis is mainly based on correlation coefficient and covariance not only of precipitation data between each pair of sequential recording times, but also variogram values obtained from the data. The temporal change of the correlation coefficients and the covariance values suggest the following possibilities for detecting change in rainfall pattern: 1) 10-min precipitation is more useful than 1-h precipitation; 2) covariance values are more useful than correlation coefficients; 3) covariance of variogram values in the polar and rectangular coordinates is the best indicator for the detection on not only intensity but also directional anisotropy; and 4) covariance values of omnidirectional variogram values are also a good indicator, but probably fail to indicate some important change in rainfall pattern.<br>

収録刊行物

  • 情報地質

    情報地質 22 (1), 3-16, 2011

    日本情報地質学会

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