Kajian Hidraulika Pelimpah Gergaji di Bendung Gandong Kerik Kabupaten Magetan
Submission Date: 2023-08-05 06:33:32
Accepted Date: 2024-11-25 12:40:48
Abstract
Mercu karet di Bendung Gandong Kerik sobek. Oleh karena itu, dilakukan penggantian bendung karet menjadi bendung tetap dengan pelimpah gergaji. Perubahan tipe pelimpah menyebabkan perubahan hidraulika aliran. Maka kajian ini dilakukan untuk mengetahui pengaruh desain pelimpah gergaji terhadap aspek hidraulika aliran agar aman untuk hulu-hilir, memenuhi kebutuhan irigasi, dan memper-kecil pembongkaran konstruksi eksisting. Pelimpah gergaji didesain dengan tinggi mercu (P) 1,2m dan tinggi muka air (H) 0,75 m. Pelimpah gergaji dibangun dengan membongkar ter-junan 1 pada konstruksi eksisting, sedangkan lantai transisi dan terjunan 2 dipertahankan. Aliran yang jatuh melalui pelimpah gergaji terjun pada jarak 6,65 m dengan Fr = 5,34. Profil muka air yang melalui ujung gigi depan pelimpah gergaji membentuk muka air yang tinggi di ujung lantai transisi sehingga muka air lanjutannya seakan-akan menerus ke loncatan hidraulik di hilir. Sedangkan profil muka air yang melalui ujung gigi belakang membentuk muka air yang kecil sehingga profil muka air lanjutannya mengalir ke arah kolam olak mengikuti geometri bendung (terjunan 2). Profil muka air di ujung terjunan 2 membentuk Fr = 4,96, V = 12,49 m/detik, y_2 = 4,22 m, y_2^' = 3,78 m. Pola loncatan hilir adalah y_2^'
Keywords
ANSYS-Fluent; Bendung; Hidraulika; Pelimpah Gergaj; Profil Muka Air
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