Abstract
Sedimentation problems occuring in Sombe River is a phenomenon of sediment grainsor particles entrained from the riverbank avalanche. The problem is exacerbated when there is moderate to high intensity rainfall, causing sediment material transported by a flood. Moreover, sand mining activities also affect the changes in the riverbed. The research aims to identify and estimate the quantity of sediment transport and the effect of the mining activities on the riverbed changes in Sombe River. In this research, direct measurement in Sombe river and observation of the mining activities in Sombe River are conducted to collect sediment samples and river morphology data. Thenceforth, the collected data will be analyzed using Rottner and Van Rijn method. According to the result of the calculation, the average of sediment discharge in Sombe River with a return period of 1 year, 2 years, 5 years and 10 years are Rottner method is 2.1 x 10 7 - 3.8 x 10 7 Tons/year; Van Rijn method is 4.0 x 10 7 – 6.9 x 10 7 Tons/years.
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