Pemodelan Fisik Konstruksi Kelompok Tiang dalam Mereduksi Aliran Super Kritis di Hilir Pintu Air Tipe Flap
DOI:
https://doi.org/10.26740/proteksi.v4n2.p67-73Keywords:
Aliran super kritis, bilangan froude, konstruksi kelompok tiang, pemodelan fisik, pintu airAbstract
Aliran super kritis di hilir pintu air dapat menjadi salah satu penyebab gerusan pada saluran. Oleh karena itu, sebelum masuk ke saluran, aliran super kritis di hilir pintu air perlu direduksi menjadi aliran sub kritis. Untuk mereduksi aliran kritis di hilir pintu air biasanya digunakan konstruksi kolam olak yang dikombinasikan dengan baffle block dan sill. Dalam penelitian ini, konstruksi kelompok tiang diuji sebagai pereduksi aliran super kritis di hilir pintu air tipe flap. Penelitian dilakukan dengan cara pemodelan fisik di laboratorium. Model konstruksi kelompok tiang yang diuji terdiri dari enam variasi. Hasil menunjukkan bahwa dalam enam variasi model konstruksi kelompok tiang yang diuji, aliran super kritis di hilir model pintu air tipe flap dapat diubah menjadi aliran sub kritis. Variasi yang paling efektif adalah Variasi IV. Pada variasi IV, model tiang dipasang paralel, tinggi model tiang 24 kali diameter model tiang, jarak antar model tiang 1/8 lebar flume, panjang model konstruksi kelompok tiang 1,95 kali jarak antara model konstruksi kelompok tiang dan model pintu air tipe flap.
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