Billah, Muhammad Arif (2024) Kajian Alternatif pada Original Design Labyrinth Spillway, Modification Labyrinth Spillway, dan Morning Glory Bendungan Sidan Berbasis Computational Fluid Dynamic untuk Meningkatkan Persentase Reduksi Banjir. Diploma thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Salah satu fungsi dari bendungan yaitu sebagai pengendali banjir di hilir. Pada Bendungan Sidan, bangunan pengendali banjir berupa pelimpah yang bertipe ambang labyrinth. Tipe ambang ini memiliki keunggulan dapat mempertinggi kapasitas reduksi banjir di hilir lebih baik jika dibandingkan dengan tipe ambang lainnya. Namun, jika dibandingkan dengan bendungan lainnya yang ada di Indonesia, persentase reduksi banjir dari Bendungan Sidan tergolong kecil. Perlu adanya kajian alternatif pada bangunan pelimpah Bendungan Sidan dengan membandingkan persentase reduksi banjirnya pada tipe ambang yang berbeda. Pada proyek akhir ini dilakukan analisis serta kajian alternatif bangunan pelimpah Bendungan Sidan dengan tiga desain yang berbeda yaitu original design, modification design, dan morning glory yang nantinya akan dianalisis sifat hidroulis dan muka airnya serta efektifitasnya terhadap reduksi banjir dengan mempertimbangkan kriteria desain yang ada dengan menggunakan aplikasi Ansys beserta manual. Hasilnya, persentase reduksi banjir dengan debit rencana 1000 tahun pada modification design dan morning glory telah meningkat jika dibandingkan dengan original design. Kemudian, berdasarkan analisis hidroulika pada original design terdapat beberapa bagian yang tidak sesuai dengan kriteria desain. Sementara pada modification design dan morning glory telah sesuai dengan kriteria desain yang berlaku. Hasil CFD dan manual pada original design terhadap tinggi muka air telah konsisten. Namun di saluran samping dan peluncur terbuka, tinggi muka air terjadi perbedaan signifikan akibat dari kondisi aliran yang acak. Sementara pada analisis CFD dan manual pada morning glory terhadap tinggi muka air konsisten di bagian crest, transisi, serta tinggi pancaran air di sky jump. Namun, jarak pancaran tidak konsisten akibat adanya perubahan kecepatan yang tidak diperhitungkan pada perencanaan manual. Selain itu, Perubahan sifat hidroulis dari hasil analisis manual dan CFD pada original design terjadi di terjunan saluran samping akibat adanya akumulasi aliran di saluran samping. Selain itu, di bagian terowong pelimpah yang memiliki kecepatan aliran yang berbeda di bagian belokan. Pada morning glory spillway, perubahan sifat hidroulis berdasarkan hasil analisis manual dan CFD terjadi di bagian konduit transisi akibat perubahan sudut belokan dan akumulasi aliran turbulen di titik belokan tersebut. Sehingga, hal ini mempengaruhi sifat pancaran air di sky jump yang memiliki jarak pancar berbeda dari hasil analisis manual. Harapannya dapat dilakukan analisis lebih mendalam mengenai sifat sifat hidroulika di bagian sky jump, terjunan pelimpah labyrinth spillway, serta konduit morning glory untuk mendapatkan hasil yang lebih komprehensif
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One of the functions of a dam is to control flooding downstream. At the Sidan Dam, the flood control structure is a spillway with a labyrinth weir type. This type of weir has the advantage of increasing the flood reduction capacity downstream better compared to other types of weirs. However, when compared to other dams in Indonesia, the flood reduction percentage of the Sidan Dam is relatively small. An alternative study on the Sidan Dam spillway structure is needed by comparing the flood reduction percentage with different weir types. In this final project, an analysis and alternative study of the Sidan Dam spillway structure were carried out with three different designs: the original design, the modification design, and the morning glory design. These will be analyzed for their hydraulic properties, water surface levels, and effectiveness in reducing floods, considering the existing design criteria using the Ansys application and manual calculations. The results show that the flood reduction percentage with a 1000-year planned discharge in the modification design and morning glory design has increased compared to the original design. Then, based on the hydraulic analysis of the original design, there are several parts that do not meet the design criteria. Meanwhile, the modification design and morning glory design meet the applicable design criteria. The CFD and manual results for the original design's water surface level are consistent. However, in the side channel and open chute, significant differences in water surface levels occur due to random flow conditions. Meanwhile, the CFD and manual analysis of the morning glory design show consistent water surface levels in the crest, transition, and water jet height in the sky jump. However, the jet distance is inconsistent due to speed changes not considered in the manual planning. Additionally, changes in hydraulic properties from the manual and CFD analysis of the original design occur at the side channel drop due to flow accumulation in the side channel. Furthermore, in the spillway tunnel section, the flow speed differs in the bend section. In the morning glory spillway, changes in hydraulic properties based on manual and CFD analysis occur in the transition conduit due to changes in the bend angle and turbulent flow accumulation at the bend point. This affects the water jet properties in the sky jump, resulting in different jet distances from the manual analysis results. It is hoped that a more in-depth analysis of the hydraulic properties in the sky jump, labyrinth spillway drop, and morning glory conduit will be conducted to obtain more comprehensive results.
| Item Type: | Thesis (Diploma) |
|---|---|
| Uncontrolled Keywords: | Computational Fluid Dynamic, Modification Design Labyrinth Spillway, Morning Glory Spillway, Original Design Labyrinth Spillway |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs T Technology > TC Hydraulic engineering. Ocean engineering > TC424 Water levels T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control T Technology > TC Hydraulic engineering. Ocean engineering > TC555 Spillways. Energy dissipation. Hydraulic jump. |
| Divisions: | Faculty of Vocational > Civil Infrastructure Engineering (D4) |
| Depositing User: | Muhammad Arif Billah |
| Date Deposited: | 19 Aug 2024 01:37 |
| Last Modified: | 19 Aug 2024 01:37 |
| URI: | http://repository.its.ac.id/id/eprint/112926 |
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