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Studi Eksperimen Runup Gelombang Pada Seawall Dengan Unit Lapis Lindung Bppt-Lock

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Studi Eksperimen Runup Gelombang Pada Seawall Dengan Unit Lapis Lindung Bppt-Lock TUGAS AKHIR – MO 141326 STUDI EKSPERIMEN RUNUP GELOMBANG PADA SEAWALL DENGAN UNIT LAPIS LINDUNG BPPT-LOCK AWANG SAMUDRA SERBA BAGUS NRP. 4313100041 Dosen Pembimbing : Haryo Dwito Armono, S.T., M.Eng., Ph.D. Sujantoko, S.T., M.T. DEPARTEMEN TEKNIK KELAUTAN FAKULTAS TEKNOLOGI KELAUTAN INSTITUT TEKNOLOGI SEPULUH NOPEMBER SURABAYA 2017 FINAL PROJECT– MO 141326 EXPERIMENTAL STUDY OF WAVE RUNUP ON A SEAWALL WITH BPPT-LOCK ARMOR UNIT AWANG SAMUDRA SERBA BAGUS NRP. 4313100041 Supervisors : Haryo Dwito Armono, S.T., M.Eng., Ph.D. Sujantoko, S.T., M.T. OCEAN ENGINEERING DEPARTMENT FACULTY OF MARINE TECHNOLOGY SEPULUH NOPEMBER INSTITUTE OF TECHNOLOGY SURABAYA 2017 iv STUDI EKSPERIMEN RUNUP GELOMBANG PADA SEAWALL DENGAN UNIT LAPIS LINDUNG BPPT-LOCK Nama Penulis : Awang Samudra Serba Bagus NRP : 4313100041 Jurusan : Teknik Kelautan FTK - ITS Dosen Pembimbing : Haryo Dwito Armono, S.T., M.Eng., Ph.D. Sujantoko, S.T., M.T. Abstrak Seawall merupakan salah satu bentuk konstruksi pelindung pantai yang berfungsi mencegah limpasan gelombang ke darat. Gelombang yang menghantam suatu bangunan akan naik pada permukaan bangunan (runup). Sehingga runup gelombang sangat penting dalam perencanaan sebuah bangunan pantai. Dalam penelitian ini dilakukan analisa runup gelombang pada pemodelan fisik seawall dengan variasi tinggi gelombang, periode gelombang dan sudut kemiringan struktur pelindung. BPPT-lock digunakan sebagai unit lapis lindung dengan pertimbangan kekuatan struktur lebih unggul dibanding dengan unit lapis lindung yang sudah ada serta dapat dipasang dengan pengaturan sederhana. Dari eksperimen yang telah dilakukan, nilai runup dari ketiga variasi kemiringan menunjukkan bahwa semakin kecil kemiringan struktur (curam) maka semakin besar nilai runup gelombangnya dan semakin besar kemiringan struktur (landai) maka semakin kecil nilai runup gelombangnya. Nilai runup gelombang pada kemiringan 1:1,15 yaitu 0,209 m dan pada kemiringan 1:2 yaitu 0,172 m. Semakin besar tinggi gelombang (H) dan periode gelombang (T) maka semakin besar pula runup gelombang yang terjadi. Nilai runup gelombang terkecil pada kemiringan 1:1,15 dengan Hs=0,064 m dan Tp=1,55 detik yaitu 0,1 meter. Sedangkan nilai runup gelombang terbesar pada Hs=0,148 m dan Tp= 1,56 detik yaitu 0,209 meter. Kata kunci : runup gelombang, seawall, BPPT-Lock, pemodelan fisik iv EXPERIMENTAL STUDY OF WAVE RUNUP ON A SEAWALL WITH BPPT-LOCK ARMOR UNIT Name : Awang Samudra Serba Bagus Reg. Number : 4313100041 Department : Ocean Engineering - FTK ITS Supervisors : Haryo Dwito Armono, S.T., M.Eng., Ph.D. Sujantoko, S.T., M.T. Abstract Seawall is one form of coastal protection stucture that prevents overtopping of waves to land. Waves that hit a building will rise on the surface of the building (runup). So the wave runup is very important in the planning of a coastal structure. In this research, wave run up analysis on physical seawall modeling with wave height variation, wave period and slope of coastal protection structure. BPPT-lock is used as a armored layer unit with the consideration of structural strength is superior to existing protective units and can be installed in simple settings. From the experiments that have been done, runup value of the three variations of the slope indicates that if the slope of the structure is smaller (steeper) then the wave runup value is greater and if the slope of the structure is greater(ramps) then the wave runup value is smaller. The value of wave runup at the slope of 1: 1.15 is 0.209 m and at the slope of 1: 2 is 0.172 m. If wave height (H) and wave period (T) are greater then the wave runup value is greater. The smallest wave runup value at the slope of 1: 1.15 with Hs = 0.064 m and Tp = 1.55 seconds is 0.1 meters. While the largest wave runup value at Hs = 0.148 m and Tp = 1.56 seconds is 0.209 meters. Keywords: wave runup, seawall, BPPT-Lock, physical modeling v KATA PENGANTAR Puji syukur kehadirat Allah SWT, karena berkat limpahan rahmat dan hidayah-Nya sehingga penulis dapat menyelesaikan Tugas Akhir dengan judul “Studi Eksperimen Runup Gelombang pada Seawall dengan Unit Lapis Lindung BPPT-Lock” sebagai salah satu syarat untuk memperoleh gelar Sarjana Teknik pada Jurusan Teknik Kelautan, Fakultas Teknologi Kelautan, Institut Teknologi Sepuluh Nopember. Dalam penyusunan laporan Tugas Akhir ini penulis menyadari bahwa masih banyak kekurangan, oleh karena itu kritik dan saran yang membangun sangat diharapkan sebagai bahan penyempurnaan laporan selanjutnya. Penulis berharap semoga Tugas Akhir ini dapat bermanfaat bagi perkembangan teknologi khususnya dalam bidang rekayasa pantai. Surabaya, Juli 2017 Penulis vi UCAPAN TERIMA KASIH Dalam proses penyusunan Tugas Akhir ini, penulis banyak sekali mendapatkan bantuan dan bimbingan dari banyak pihak. Untuk itu, pada kesempatan ini izinkan penulis menghaturkan rasa terima kasih yang sebesar- besarnya kepada : 1. Allah SWT yang telah memberikan rahmat dan hidayah-Nya sehingga Tugas Akhir ini dapat diselesaikan dengan baik. 2. Orang tua penulis yang selalu mendoakan, memberikan motivasi dan masukan dalam pengerjaan Tugas Akhir ini. 3. Bapak Haryo Dwito Armono, S.T., M.Eng., Ph.D., selaku Dosen Pembimbing Pertama yang berkenan meluangkan waktunya untuk membimbing, mengarahkan dan memberikan masukan serta ilmu yang berguna dalam menyelesaikan Tugas Akhir ini. 4. Bapak Sujantoko, S.T., M.T., selaku Dosen Pembimbing Kedua yang berkenan meluangkan waktunya untuk membimbing, mengarahkan dan memberikan masukan serta ilmu yang berguna dalam menyelesaikan Tugas Akhir ini. 5. Bapak Drs. Mahmud Musta’in, M.Sc., Ph.D., selaku kepala Laboratorium Lingkungan dan Energi Laut yang berkenan memberikan ijin penggunaan laboratoium. 6. Bapak Arif Mochtar, selaku teknisi Laboratorium Lingkungan dan Energi Laut yang berkenan meluangkan waktunya dalam membantu proses pengujian. 7. Teman-teman seperjuangan, khususnya Ali, Vega, Rindy, Danny, Iyan, dan Rorry yang banyak membantu dalam pelaksanaan eksperimen dan penyusunan Tugas Akhir. 8. Keluarga Besar Angkatan 2013 Teknik Kelautan FTK-ITS (Valtameri) atas kebersamaan, kekeluargaan dan bersama-sama menjalani kehidupan perkuliahan. vii DAFTAR ISI LEMBAR PENGESAHAN ....................................................................................... iii ABSTRAK ................................................................................................................. iv KATA PENGANTAR ............................................................................................... vi UCAPAN TERIMA KASIH ...................................................................................... vii DAFTAR ISI .............................................................................................................. viii DAFTAR GAMBAR ................................................................................................. x DAFTAR TABEL ...................................................................................................... xii LAMPIRAN ............................................................................................................... xiii BAB I. PENDAHULUAN ......................................................................................... 1 1.1 Latar Belakang ..................................................................................................... 1 1.2 Rumusan Masalah ................................................................................................ 2 1.3 Tujuan Penelitian ................................................................................................. 2 1.4 Manfaat Penelitian ............................................................................................... 2 1.5 Batasan Masalah................................................................................................... 2 1.6 Sistematika Penulisan .......................................................................................... 3 BAB II. TINJAUAN PUSTAKA DAN DASAR TEORI .......................................... 4 2.1 Tinjauan Pustaka .................................................................................................. 4 2.2 Dasar Teori ........................................................................................................... 5 2.2.1 Dinding Pantai (Seawall) ...................................................................... 5 2.2.2 Unit Lapis Lindung BPPT-Lock ........................................................... 5 2.2.3 Karakteristik Gelombang ...................................................................... 6 2.2.4 Gelombang Irreguler ............................................................................. 8 2.2.5 Spektra Gelombang ............................................................................... 8 2.2.6 Runup Gelombang ................................................................................ 10 2.2.7 Pemodelan Fisik .................................................................................... 12 BAB III. METODOLOGI PENELITIAN ................................................................. 17 3.1 Fishbone Diagram ................................................................................................ 17 3.2 Diagram Alir Penelitian ....................................................................................... 18 viii 3.3 Penjelasan Diagram Alir Penelitian ..................................................................... 19 3.3.1 Studi Literatur ......................................................................................
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