Sediment Characteristics of Bed Load Transport in Downstream of Progo River, Indonesia

Abstract

Progo River is one of the rivers that has a sediment supply from volcanic and non-volcanic areas. Sediment transport, especially the bed load transport, it is very influential on the phenomenon of river degradation and aggradation. Therefore, a study to determine the characteristics of bed load transport is needed and important. The research was carried out in the downstream part of Progo River. Sampling locations were taking in four locations, namely Ancol Bridge, Kebon Agung II Bridge, Kebon Agung I Bridge and Bantar Bridge. The bed load transport measurement tool was used Helley Smith (WMO, 1980) equipment. Every river cross section is taken three times. The results showed that the sediment type of bed load transports is silty sand, with specific gravity values of 2.67 to 2.70. The average diameter values (D50) of the bed load transports vary greatly from 0.129 mm to 0.454 mm. The values of bed load transports vary greatly and are influenced by the values of the discharges. The correlation between bed load transport and discharge is linear, with R values are 0.85 to 0.99.