Pemodelan Numerik Run Up dan Overtopping Struktur Seawall Buis Beton
Submission Date: 2019-07-29 13:15:26
Accepted Date: 2020-01-31 10:45:30
Abstract
Bangunan pelindung pantai banyak macam dan jenisnya, namun memiliki tujuan yaitu untuk melindungi kawasan pantai dari gelombang. Dikarenakan gelombang akan bersifat katastropik apabila terlalu besar. Penelitian terhadap bangunan pelindung pantai banyak dilakukan pada analisa transmisi, refleksi, limpasan dan rayapan. Pemilihan buis beton untuk penelitian dikarenakan masyarakat pesisir banyak menggunakannya sebagai bangunan pantai. Karena buis beton mudah dijumpai, murah dan mudah dalam pengaplikasiannya. Namun belum ada analisis secara ilmiah mengenai buis beton sebagai bangunan pantai. Pada penelitian ini akan dilakukan analisis run up dan overtopping dengan berdasarkan gelombang regular uji fisik buis beton Balai Pantai menggunakan pemodelan CFD Flow-3D. Penelitian ini memvariasikan tinggi freeboard buis beton yaitu 0,05 m dan 0,2 m, variasi kemiringan untuk masing-masing freeboard 45°, 26,56° dan 18,26° dengan mengubah perletakan buis beton secara vertikal. Untuk hasil variasi, model dengan freeboard 0,05 memiliki hasil run up sama 0,05 m atau tinggi maksimal struktur, sedangkan nilai run up pada struktur dengan freeboard 0,2 hasil run up terendah yaitu pada model B3.60 dengan kemiringan 18,26° sebesar 0,17 m. Untuk overtopping relatif struktur dengan freeboard 0,2 lebih kecil dari pada struktur dengan freeboard 0,05. Hasil dari run up dan overtopping dilakukan perbandingan dengan pengaruh kemiringan, tinggi freeboard dan irribaren parameter dari penelitian lain, namun perbandingan dilakukan hanya untuk melihat trend persebarannya karena struktur yang diteliti berbeda dengan yang dilakukan oleh peneliti lain.
Keywords
Buis Beton; Flow-3D; Overtopping; Regular; Run Up; Seawall
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