SIMULASI PERMODELAN ALIRAN PADA PEMBANGUNAN TANGGUL PENUTUP SUNGAI DI BENDUNG SEI WAMPU KABUPATEN LANGKAT

Setiawan, Fanis (2022) SIMULASI PERMODELAN ALIRAN PADA PEMBANGUNAN TANGGUL PENUTUP SUNGAI DI BENDUNG SEI WAMPU KABUPATEN LANGKAT. Sarjana (S1) thesis, Universitas Islam “45” Bekasi.

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Abstract

The Sei Wampu Weir construction project has problems with river cover embankment work, where the river cover embankment experiences scouring on the riverbed during flooding. Flow modeling simulations are carried out to determine the maximum flow speed, so that the building structure in the form of appropriate cover concrete blocks can be determined. The analysis of water availability in this study used the f.j mock method by taking into account the watershed area, rainfall data, climatological data, evapotranspiration, and other supporting data so that 80% of the mainstay discharge was then obtained. Simulation of flow modeling on river cover embankments was performed using the Hec-Ras 5.0.7 program with three scenarios. The determination of Locked Concrete Blocks as a handling solution refers to the Scientific Manuscript of Locked Concrete Blocks as Riverbed Control Buildings of the Water Resources Center in 2014. Based on the results of the mainstay discharge analysis, 80% was obtained in 2020, which was 139.10 m3/s. The model results in the first scenario with the width of the river still open about 85 meters obtained a flow speed of 2.04 m/s, the second scenario with the width of the river still open about 30 meters obtained a flow speed of 2.48 m/s and the third scenario with a river width that was still open about 10 meters obtained a flow speed of 4.34 m/s. The locked concrete blocks for the first scenario use the six-foot locked concrete block type, while the second and third scenarios use the eight-foot locked concrete block. Based on the results of numerical modeling and analysis of locked concrete blocks, the appropriate and efficient scenario for closing the river cover embankment in the sei wampu weir construction project is the second scenario.

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