Farid, Budiyanto and Dr. Ir. Very Darmawan,, ST.,MT.IPM and Dr. Eng. Andre Primanto, H, ST.,MT. (2023) Analisis Pengendalian Gerusan Tebing Sungai Di Jembatan Mahkota Sungai Mahakam. Magister thesis, Universitas Brawijaya.
Abstract
Peristiwa longsornya bantaran sungai yang terjadi pada April 2020 di sekitar Jembatan Mahkota Sungai Mahakam menjadi factor utama dalam mengarahkan penelitian di lokasi ini. Fokus penelitian pada perilaku hidrodinamik dan tegangan geser pasca-geser perlu dilakukan sehingga dapat diketahui dampak pada fondasi jembatan di sisi kanan bagian sungai dan konstruksi jalan menuju fasilitas intake pengelolaan limbah Kalhol. Oleh karena itu, solusi untuk mengurangi resiko yang berkelanjutan perlu ditetapkan. Metode numerik digunakan untuk mengamati perilaku aliran dan tegangan geser di sekitar jembatan dengan pendekatan pemodelan numerik menggunakan Delft3d. 5 skenario model disiapkan untuk mengetahui perubahan tegangan geser dan pola aliran di lokasi rawan longsor terutama di tikungan sungai dan di pondasi jembatan Mahkota. Pemodelan menggunakan data observasi lapangan yang terdiri dari debit di hulu serta fluktuasi muka air di hilir. Pengamatan dilakukan selama 25 jam pada 25-26 Desember 2020. Dalam scenario model eksisting teridentifikasi tegangan geser hingga 1,12 N/m2 untuk kondisi ekstrim walaupun pola aliran tidak menunjukkan terjadinya vortex. 4 Scenario model lainnya meliputi penempatan 1 groyne, 3 groyne parallel tegak lurus tebing sungai, 3 groyne parallel dengan arah sudut 40 derajat terhadap tebing sungai dan pemasangan geobag penuh. Dua skenario model terakhir adalah solusi yang memberikan hasil maksimal dalam mengurangi tegangan geser menjadi 0.004 N/m2 untuk skenario model 4, dan 0,01 N/m2 untuk skenario model 5 di sekitar area longsor dan pondasi jembatan. Mempertimbangkan ketersediaan material dan kemudahan pemasangan, scenario model 5 dapat dipilih, meskipun pola aliran pusaran juga terbentuk dalam skenario ini, lokasinya tidak tepat di tepi tanggul dan kecepatan yang dihasilkan 0,5 m / s hanya terjadi selama kondisi ekstrim.
English Abstract
The Mahakam riverbank landslide that occurred in early June 2020 around the Mahkota Bridge was a major factor in conducting research at this location. The focus of research on hydrodynamic behavior and post-shear stress needs to be carried out so that the impact on the bridge foundation on the right side of the river section and the construction of the road to the Kalhol waste management intake facility can be known. Therefore, solutions to mitigate sustainable risks need to be established. The numerical method is used to observe the behaviour of flow and shear stress around the bridge with the numerical modelling approach using Delft3d. 5 model scenarios are prepared to determine changes in shear stress and flow patterns in landslide-prone locations, especially in river bends and on the foundation of the Mahkota bridge. The modelling uses field observation data consisting of discharge upstream as well as fluctuations in water level downstream. The observation was conducted for 25 hours on December 25-26, 2020. In the existing model scenario, shear stresses of up to 1.12 N/m2 were identified for extreme conditions even though the flow pattern did not indicate the occurrence of vortexes. 4 Other scenario models include the placement of 1 groyne, 3 parallel groynes perpendicular to the river bank, 3 parallel groynes with a 40º angle to the river bank and the installation of full geobags. The last two model scenarios are solutions that provide maximum results in reducing shear stress to 0.004 N/m2 for model scenario 4th, and 0.01 N/m2 for model scenario 5th around landslide areas and bridge foundations. Considering material availability and ease of installation, model scenario 5th can be chosen, although vortex flow patterns are also formed in this scenario, the location is not exactly at the edge of the embankment and the resulting velocity of 0.5 m/s only occurs during extreme conditions.
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | 042307 |
| Uncontrolled Keywords: | : sungai mahakam, jembatan mahkota, tanah longsor, bantaran sungai.- mahakam river, mahkota bridge, landslide, riverbank |
| Divisions: | Fakultas Teknik > Teknik Pengairan |
| Depositing User: | Unnamed user with username pratiwi |
| Date Deposited: | 11 Jan 2024 01:45 |
| Last Modified: | 11 Jan 2024 01:45 |
| URI: | http://repository.ub.ac.id/id/eprint/207435 |
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