• Journal of The Geomorphological Association of Korea
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• v.18 no.1
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• pp.29-39
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• 2011

This study aims to investigate the relationship between the mean diameter of bed material and the tractive force due to flow in domestic natural rivers. To investigate the size of bed material, sampling in the field and estimation of mean diameter have been conducted. The relationship between the mean diameters and tractive force is figured out by calculating tractive force and frictional velocity. The field works have been carried out at 94 location of 18 rivers including 4 large watersheds. In order to determine the quantities of discharge used to calculate the tractive force, the various values of frequency have been estimated and tested. As a result, it is found that the 1.01 year frequency discharge is most appropriate for the bankfull discharge. From results, the relatioship between the mean diameter of bed material the tractive force is presented in this study.