Alternatif Kajian Hidraulis dan Stabilitas Tipe Bangunan Pelimpah Pada Studi Kasus Bendungan Jlantah, Kabupaten Karanganyar, Jawa Tengah

Affendi, Aviar Yusuf (2023) Alternatif Kajian Hidraulis dan Stabilitas Tipe Bangunan Pelimpah Pada Studi Kasus Bendungan Jlantah, Kabupaten Karanganyar, Jawa Tengah. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perencanaan bangunan pelimpah perlu mempertimbangkan beberapa aspek seperti aspek hidrologi dan hidrolika untuk merencanakan bentuk dan tipe bangunan pelimpah. Aspek geologi dan geoteknik untuk mempertimbangkan lokasi bangunan pelimpah. Bangunan pelimpah perlu dipastikan aman dalam operasinya, bangunan pelimpah perlu dilakukan perencanaan hidraulis dan stabilitas. Dua aspek tersebut berkaitan erat dan tidak dapat dipisahkan. Analisis hidraulis bangunan pelimpah perlu dicek untuk mengetahui perilaku aliran dan syarat-syarat pada masing-masing komponen bangunan pelimpah, seperti kondisi kecepatan aliran, tinggi muka air, angka froude, analisis terhadap kavitasi, aliran getar, aliran silang, dan potensi gerusan lokal. Sedangkan pada stabilitas bangunan pelimpah perlu dicek kondisi stabilitas seperti stabilitas terhadap guling, geser, rembesan, dan eksentrisitas. Dalam hal ini, hasil analisis hidraulis dan stabilitas bangunan pelimpah pada bendungan jlantah, didapatkan hasil bahwa bangunan pelimpah kondisi eksisting sudah memenuhi dari tinjauan stabilitas (stabilitas terhadap rembesan, guling, geser, dan eksentrisitas), namun pada tinjauan hidraulis, pada saluran transisi didapatkan hasil analisis bahwa saluran transisi tidak memenuhi kriteria karena terjadi aliran silang, maka diperlukan sebuah alternatif desain untuk mengatasi hal tersebut. Alternatif yang dilakukan yaitu dengan memperbesar sudut penyempitan pada saluran transisi dari yang sebelumnya 16,717° menjadi 12,5° dari hasil analisis pada saluran transisi alternatif, didapatkan bahwa saluran transisi aman terhadap aliran silang. Sedangkan pada saluran pengarah, pelimpah, saluran peluncur, kolam olak, escape channel, dan sungai sudah memenuhi kriteria kajian hidraulis.
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The planning of spillway structures requires consideration of several aspects, such as hydrology and hydraulics, to design the form and type of the spillway structure. Geological and geotechnical aspects are also essential in determining the location of the spillway structure. Ensuring the safety of the spillway structure during its operation necessitates both hydraulic and stability planning. These two aspects are closely related and inseparable. If a spillway structure only meets one of these criteria, a reassessment of the design is necessary. The hydraulic conditions of the spillway structure must be checked to understand the flow behavior and requirements for each component, such as flow velocity, water level, Froude number, cavitation analysis, flow vibration, cross flow, and local scour. Meanwhile, the stability of the spillway structure needs to be evaluated, considering stability against sliding, overturning, seepage, and eccentricity. In this case, the hydraulic and stability analyses of the spillway structure at the Jlantah dam showed that the existing condition of the spillway structure meets the stability criteria (stability against seepage, sliding, overturning, and eccentricity). However, in terms of hydraulic considerations, the transitional channel did not meet the criteria due to cross flow. Therefore, an alternative design is needed to address this issue. The alternative design involves increasing the contraction angle of the transitional channel from the previous 16.717° to 12.5°. The analysis of the alternative transitional channel showed that it is now safe against cross flow. On the other hand, the guide channel, spillway, launch channel, stilling basin, escape channel, and river all meet the criteria for hydraulic assessment.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Bangunan Pelimpah, Hidraulis, Stabilitas, Bendungan.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs T Technology > TC Hydraulic engineering. Ocean engineering > TC555 Spillways. Energy dissipation. Hydraulic jump.
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Aviar Yusuf Affendi
Date Deposited:	15 Nov 2023 07:58
Last Modified:	15 Nov 2023 07:58
URI:	http://repository.its.ac.id/id/eprint/103355

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