Amelia, Aisyah (2017) Studi Kapasitas Angkut dan Gerusan Lokal Pada Penampang Sungai Brantas Akibat Pilar Jembatan Tol Mojokerto-Kertosono. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Jalan tol Mojokerto-Kertosono melintasi sungai Brantas di Kecamatan Gedeg, Mojokerto, untuk itu dibutuhkan jembatan sepanjang 299 m. Konstruksi jembatan tersebut berpotensi mengakibatkan terjadinya gerusan lokal pada dasar sungai maupun perubahan morfologi sungai. Oleh sebab itu perlu dilakukan studi kapasitas angkut dan gerusan lokal pada penampang sungai akibat pilar jembatan.
Pada tugas akhir ini, dilakukan perhitungan debit rencana dengan metode Gumbel. Dalam analisa gerusan lokal digunakan modul Hydraulic Design – Bridge Scour pada program Hec-Ras 5.0.3 untuk memprediksi kedalaman gerusan. Sedangkan analisa angkutan sedimen dihitung dengan permodelan sedimen pada program Hec-Ras 5.0.3.
Hasil studi ini menghasilkan debit banjir rencana di sungai Brantas untuk 2 tahun, 5 tahun, 10 tahun, 25 tahun, 50 tahun, dan 100 tahun secara berturut-turut adalah 1.213,58 m3/dt, 1.444,48 m3/dt, 1.597,36 m3/dt, 1.790,53 m3/dt, 1.933,83 m3/dt, 2.076,07 m3/dt. Akibat dari contraction scour atau penyempitan sungai sebelum dibangun jembatan, pada debit 100 tahun terjadi gerusan sedalam 0,47 m di bagian kanan penampang sungai. Sedangkan setelah dibangun jembatan, diperkirakan gerusan akibat contraction scour dan pilar menjadi 7,4 m, kedalaman ini mendekati hitungan analitik sebesar 8,07 m. Volume angkutan sedimen kumulatif sebelum ada jembatan adalah 386.551 m3 dan penurunan dasar sungai rata-rata sebesar 1,03 m. Sedangkan setelah ada jembatan, volume angkutan sedimen kumulatif yang terangkut adalah 569.775 m3 dengan penurunan dasar sungai rata-rata sebesar 1,51 m.
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The Mojokerto-Kertosono toll road is crossing Brantas River in Gedeg sub-district, Mojokerto, so the bridge along the 299 m is required. The bridge construction has potential to cause local scouring at river bed and also the changes in river morphology. Therefore, it is necessary to study the transport capacity and local scour at the river cross section due to the bridge piers.
In this final project, the calculation of the flood discharge design used the Gumbel method. In the local scour analysis used the Hydraulic Design – Bridge Scoure module in the Hec-Ras 5.0.3 program to predict the scour depth. While the sediment transport analysis was calculated by sediment modeling in the Hec-Ras 5.0.3 program.
The results of this study obtained flood discharge designs in Brantas river for 2 years, 5 years, 10 years, 25 years, 50 years, and 100 years respectively were 1,213.58 m3/s, 1,444.48 m3/s, 1,597. 36 m3/s, 1,790.53 m3/s, 1,933.83 m3/s, 2,076.07 m3/s. The effect from the contraction scour before the bridge was built with 100 years discharge design is 0.47 m deep scour that occurred on the right side of the river cross section. Meanwhile, after the bridge was built, it is estimated that scouring due to contraction scour and piers become 7.4 m, this depth is approach the analytical result which is 8.07 m. The cumulative sediment transport volume before the bridge was built is 386,551 m3 and the average of river bed lowering is 1.03 m. Whereas after the bridge was built, the cumulative transport volume of sediment that transported is 569,775 m3 with the average of river bed lowering is 1.51m.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSS 624.284 Ame s |
| Uncontrolled Keywords: | Angkutan sedimen; Gerusan Lokal; Morfologi; Sungai Brantas |
| Subjects: | T Technology > TG Bridge engineering |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | Aisyah Amelia |
| Date Deposited: | 02 Feb 2018 04:29 |
| Last Modified: | 08 Mar 2019 02:24 |
| URI: | http://repository.its.ac.id/id/eprint/46496 |
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