Analysis of the Influence of River Flow Engineering Upstream Areas on Sediment Transport in the Downstream Areas

Flooding is one of the common problems in Jakarta, and one of its causes is the overflow of the Pesanggrahan River. To overcome it, the Jakarta Provincial Government in 2013 normalized the river. However, several studies show that normalization results in channel instability on sediment transport. The purpose of this research is to analyze the effect of river normalization in upstream areas on sediment transport in the downstream regions of the section that is reviewed. The identification of changes in river flow before and after Normalization was carried out based on data from the Central Office of River Region Ciliwung-Cisadane, Ministry of Public Works. HEC-RAS is used to simulate sediment transport in the river segment before and after Normalization. The results are used to determine cross-section changes due to sediment transport and to determine the water level of the river. From the water level, the hydraulic radius can be calculated and then carried out sediment transport calculation using Ackers-White equation since the equation using grain distribution from range 0.02 – 4.94 mm. From the calculation, it can be seen that sediment transport at the upstream point increases 155.11 tons/year, at the middle point increases 89.64 tons/year, and at the downstream point decreases 0.28 tons/year.