STUDY ON CHARACTERISTICS OF MOVEMENTS OF ORGANIC MATERIALS IN GRAVEL RIVERS

Abstract

A field observation was performed to understand the characteristics of transport of dissoloved and particulate organic materials in a gravel river. The results of the observation show that the fine particulate organic materials, termed FPOM, were transported toward river bed by local seepage flow, which yields the accumulation of FPOM in river bed. A series of laboratory experiments was conducted to know the effects of hydraulic conditions on the transport of FPOM. It was found that the cell-like structures of seepage flow are generated near the channel bed surface, which affects the rate and the total amount of the accumulation of FPOM in river bed.