An Examination to Simplify the Operation of Grain Size Analysis on the Near-shore Sediments

In this paper, the reliabirity of statistical parameters, which were obtained from 1/2 and 1phi sieve interval analysis, were examined comparing to the values of 1/4phi sieve interval analysis.Swash zone and dune sands were collected from the shoreline along Sendai and Shonai Coastal Plain, they are located north eastern part of Honshu Island, Japan. 468 samples were prepared for this analysis. They were sieved by 1/4phi interval mean diameter, standard deviation and skewness were calculated respectively by the moment methods. After that the statistical parameters by using 1/2phi and 1phi sieve interval are calculated numerically.Values obtained from 1/2phi sieve interval analysis indicate close approximation to those of 1/4phi sieve analysis. On the other hand, the values obtained form 1phi sieve analysis did not indicate exact grain size characteristics except the mean diameter.