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In this study, the river network model, which was mainly used to the mountain basin, is applied to the Chitose River basin. The characteristics of sediment transport are evaluated to indicate the validity of the river network model. In this model,water flow discharge and sediment discharge are given on this model. Channel width and averaged grain size of bed material are calculated and compared with actual measurement to verify the model propriety. As a result, the river network model can be applied to the Chitose River basin made up with the peaty marshland and the low-lying basin. Also the characteristics of sediment transport can be estimated with the relationship between sediment discharge and geological surface conditions.

THE STUDY ON SEDIMENT TRANSPORT IN LOW-LYING BASIN OF THE CHITOSE RIVER