A Study of Sedimentation at the River Estuary on the Change of Reservoir Storage

¹ Departement of Civil Engineering, Engineering Faculty, University Muhammadiyah Purwokerto, Purwokerto- Indonesia
Doctoral Student of Civil Engineering, Enginering Faculty, Diponegoro University, Semarang- Indonesia
² Department of Civil Engineering, Diponegoro University, Semarang- Indonesia
³ Center River, Center of Research and Development Water Resources, Surakarta- Indonesia

^* Corresponding author: iskaharoke@gmail.com

Abstract

Estuary of the river that leads to the reservoir has characteristics include: relatively flat, there is a change in the increase of wet cross-sectional area and backwater. The backwater will cause the flow velocity to be reduced, so that the grains of sediment with a certain diameter carried by the flow will settle in the estuary of the river. The purpose of this research is to know the distribution and sedimentation pattern at the river estuary that leads to the reservoir with the change of water level in the reservoir storage, so the solution can be found to remove / reduce sediment before entering the reservoir. The method used is the experimental, by making the physical model of the river estuary leading to the reservoir. This study expects a solution to reduce sedimentation, so that sedimentation can be removed / minimized before entering the reservoir. This research tries to apply bypass channel to reduce the sedimentation at the river estuary. Bypass channels can be applied to overcome sedimentation at the river estuary, but in order for the sediment to be removed optimally, it is necessary to modify the mouth of bypass channel and channel angle.