Studi Eksperimen Pengaruh Sudut Orientasi Spur Dike pada Belokan Saluran Terbuka terhadap Pola Scouring

Mumtaz, Lathifatus Sa'diyah (2026) Studi Eksperimen Pengaruh Sudut Orientasi Spur Dike pada Belokan Saluran Terbuka terhadap Pola Scouring. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Spur dike merupakan salah satu bangunan sungai yang digunakan untuk mengendalikan pola aliran dan mengurangi potensi gerusan di sekitar tebing saluran. Pada saluran berbelok, khususnya tikungan 90°, interaksi antara aliran sekunder, struktur spur dike, dan sedimen dasar menghasilkan pola aliran dan scouring yang kompleks. Penelitian ini bertujuan untuk mengkaji pengaruh variasi sudut orientasi spur dike terhadap arah aliran (θ) dan posisi spur dike di tikungan (θp) terhadap karakteristik scouring pada kondisi aliran subkritis. Eksperimen dilakukan menggunakan flume tank dengan tikungan 90° dengan variasi spur dike impermeabel dan permeabel pada setiap percobaan. Variasi sudut orientasi spur dike yang digunakan adalah θ = 75°, 90°, dan 105°, sedangkan variasi sudut penempatan spur dike di tikungan adalah θp = 30°, 60°, dan 90°. Aliran yang digunakan bersifat steady dengan variasi bilangan Froude pada rentang subkritis. Pengukuran kecepatan aliran arus dilakukan menggunakan current meter, sedangkan kedalaman dan pola scouring maksimum diukur setelah kondisi kesetimbangan tercapai. Hasil penelitian diharapkan dapat menunjukkan pengaruh kombinasi sudut orientasi, sudut penempatan, dan porositas spur dike terhadap kedalaman gerusan maksimum. Penelitian ini diharapkan dapat memberikan kontribusi dalam pengembangan desain spur dike yang lebih efektif pada saluran berbelok.
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Spur dike is one of the river training structures used to control flow patterns and reduce the potential for bank erosion. In curved channels, particularly with a 90° bend, the interaction between secondary flow, spur dike structures, and bed sediment generates complex flow and scouring patterns. This study aims to investigate the effect of variations in spur dike orientation angle (θ) relative to the flow direction and the spur dike placement angle along the bend (θp) on scouring characteristics under subcritical flow conditions. The experiments were conducted in a laboratory flume with a 90° bend, using both impermeable and permeable spur dikes in each test. The spur dike orientation angles tested were θ = 75°, 90°, and 105°, while the placement angles along the bend were θp = 30°, 60°, and 90°. The flow conditions were steady, with variations in the Froude number within the subcritical range. Flow velocity measurements were carried out using a current meter, while the maximum scour depth and scouring patterns were measured after equilibrium conditions were achieved. The results of this study are expected to demonstrate the influence of the combined effects of orientation angle, placement angle, and spur dike porosity on the maximum scour depth. This research is expected to contribute to the development of more effective spur dike designs for curved channels.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	spur dike, gerusan, permeabel, tikungan 90°, aliran tetap, scouring, 90° bend, steady flow
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport T Technology > TC Hydraulic engineering. Ocean engineering > TC203.5 Coastal engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Lathifatus Sa'diyah Mumtaz
Date Deposited:	28 Jul 2026 08:51
Last Modified:	28 Jul 2026 08:51
URI:	http://repository.its.ac.id/id/eprint/139104

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