Preliminary Study on the Fluvial Deposits of Main Rivers in Kanto-plain

The distribution of the median 0o, Mdo, of the fluvial deposits of main, rivers in Kanto plain is report_??_d in this article. The tractive fore of the current in moving bed-material, T, is given by T=WRI where R is hydraulic radius and I is gradient. But the hydraulic radius changes in very small scale comparing to the gradient, therefore the mean grain size of the deposits in this distric is mainly, deterniined by gradient.