時系列解析を応用した砕屑物の円磨度の測定方法

概要

論文の詳細を見る
Roundness is one of the useful information derived from sedimentary clasts. As themeasurementmethod, however, is ambiguous and objective, the discussion based on roundnesshas been not quantitative but qualitative until now.This study shows new measurement method of roundness, which is obtained by transformfrom two dimension image of clasts in time series data. In concrete terms, the silhouettesof pebbles in Krumbein's plate are graphed with software on the market, and the datacan be analyzed using time series methods.As a result of that, an especially plain feature was not admitted in the autocorrelationanalysis in individual pebble data. But it is found that the lower roundness shows the largerstandard deviation of difference between the moving average (MA) and the physical value.The correlation of roundness and the standard deviation with MA = 30 is extremely high(r= 0.947). At that time, the relational expression of roundness (x) inMA=30 and the standarddeviation (y) is shown with y = − 0.0139x+0.0148. The data from Powers' report hasalso the relation between roundness and the standard deviation in extremely high correlation(r = 0.960). The relational expression in this case is shown by y = − 0.0073log(x) +0.0019.
名古屋外国語大学の論文