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All Journal REKA RACANA Journal of Engineering and Technological Sciences REKAYASA Jurnal Teknik Sipil JURNAL TEKNIK HIDRAULIK
Andojo Wurjanto, Andojo
Program Studi Teknik Kelautan, Fakultas Teknik Sipil dan Lingkungan Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132.
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Physics

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Extreme Significant Wave Height Map of Indonesia Based on SEAFINE and ERA5 Database Andojo Wurjanto; Julfikhsan Ahmad Mukhti; Hijir Della Wirasti
Journal of Engineering and Technological Sciences Vol. 53 No. 1 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.1.10

Abstract

Significant wave height, , is one of the most utilized ocean parameters. Extreme  with 1-yearly and 100-yearly return periods are required for the design of most offshore structures. A previous study by Wurjanto, et al. (2020) attempted to utilize the SEAFINE database to develop extreme  maps of Indonesian seas. However, SEAFINE does not cover the eastern Indonesian seas. This study analyzed the extreme values from ERA5 data for Indonesian seas and utilized the data to complete the extreme  map previously developed by Wurjanto, et al. (2020). The ERA5  data on the eastern Indonesian seas as well as the central and western seas were extracted for validation purposes. The ERA5 extreme value was less than half the  value compared to the SEAFINE-based results in most intersecting areas. For the development of the map, we took the SEAFINE-based map from Wurjanto et al., which covers the western and middle Indonesian seas, and filled the eastern part with extreme ERA5  data. It was found that a wave height multiplying factor of 2.0 was the most suitable for ERA5 in the developed map to make a seamless wave height transition from SEAFINE to ERA5 data.
Tata Cara Perencanaan Teknik Jaringan Irigasi Rawa Yully Santi Eka Putri; Andojo Wurjanto
RekaRacana: Jurnal Teknil Sipil Vol 2, No 1: Maret 2016
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v2i1.48

Abstract

ABSTRAKRawa sebagai salah satu sumber daya air di Indonesia, memiliki total luas lahan yang cukup besar yaitu kurang lebih 33,41 juta ha, yang terbagi ke dalam lahan rawa lebak seluas 13,28 juta ha dan sisanya lahan rawa pasang surut 20,13 juta ha. Pengelolaan dan pengembangan lahan rawa sebagai lahan pertanian sudah berjalan namun belum optimal dikarenakan belum adanya tata cara atau standar perencanaan irigasi khusus lahan rawa. Pedoman yang sudah tersedia dan berjalan baik di Indonesia saat ini adalah standar perencanaan irigasi permukaan. Penulisan penelitian ini bertujuan untuk menghasilkan sebuah Tata Cara Perencanaan Teknik Jaringan Irigasi Rawa khususnya rawa pasang surut. Penyusunan Tata Cara Perencanaan Teknik dilakukan dengan cara melakukan kaji literatur kebijakan yang berlaku, referensi akademis dan non akademis, artikel serta studi terdahulu terkait pekerjaan rawa. Tata Cara Perencanaan Teknik Jaringan Irigasi Rawa memuat tahapan-tahapan sebagai langkah awal dalam perencanaan pekerjaan jaringan irigasi rawa terutama untuk daerah rawa pasang surut.Kata kunci: Perencanaan teknik, tata cara, jaringan irigasi, rawa, pasang surut. ABSTRACTSwamp is one of the water resources in Indonesia with a considerably large area at approximately 33.41 million ha in total. This area is divided into 13.28 million ha lowland swamp and 20.13 million ha tidal swamps. These swamps are still underutilised compared to population growth and demand due to the absence of procedure or standard for swamp irrigation design, where currently the only available standard for surface irrigation design.The aim of this thesis is to develop a technical procedure for swamp irrigation network planning, especially for tidal swamps. The development of this technical procedure is based on literature review on available policies, academic and non-academic references, and past articles and studies regarding swamp irrigation planning. This technical procedure for swamp irrigation planning includes steps as an initial phase for planning on swamp irrigation work planning, especially for tidal swamp areas.Keywords : Technical planning, procedure, irrigation network, swamp, tides. 
Transmisi Gelombang pada Breakwater Tenggelam Ketut Kinog; Hang Tuah; Andojo Wurjanto; Krisnaldi Idris
Jurnal Teknik Sipil Vol 11 No 3 (2004)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2004.11.3.3

Abstract

Abstrak. Kerusakan pantai dalam bentuk abrasi pantai, telah merupakan masalah bagi banyak negara. Untuk pemecahannya, para ahli telah mengembangkan banyak jenis bangunan seperti revetment, groin dan detached breakwater. Walaupun jenis bangunan tersebut sebagian telah dapat mencegah abrasi, tapi umumnya dianggap tidak ramah lingkungan, khususnya ditinjau dari sudut pandang kepariwisataan. Makalah ini mencoba mencari bentuk bangunan pengaman pantai yang ramah lingkungan, dengan mengambil sifat terumbu karang, yaitu berupa breakwater tenggelam. Bahasan difokuskan pada kemampuan breakwater tenggelam meredam gelombang datang, dengan pendekatan berupa hubungan parameter kecuraman gelombang Hi/gT2 versus koefisien transmisi Ct = Ht /Hi , untuk parameter b/L dan d/h tertentu.Hasilnya berupa grafik transmisi gelombang, yang menunjukkan bahwa Ct menjadi semakin kecil bila b/L atau d/h semakin besar.Abstract. Beach damages in the form of beach erosion, has been made problems in many countries. For solving the problem, the experts have been developed many kinds of structure, as revetment, grion and detached breakwater. Although a part of the structure succeed to restrain the beach erosion, but generally it is not friendly environmental, especially from the tourism view. This paper try to develop friendly environmental beach protection, by taking the coral characteristic, in the form of submerged breakwater. The analysis is focused in the capability of the submerged breakwater in reducing the incident waves, which be approahed by the relation of wave steepness Hi/gT2 versus transmission coefficient Ct = Ht /Hi , for certain b/L and d/h. The result is wave transmission figures, which show that the bigger value of b/L or d/h the smaller value of Ct.
Stabilitas Armor pada Breakwater Tenggelam Ketut Kinog; Hang Tuah; Andojo Wurjanto; Krisnaldi Idris
Jurnal Teknik Sipil Vol 12 No 1 (2005)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2005.12.1.1

Abstract

Abstrak. Untuk pengamanan pantai, tinggi gelombang dapat direduksi dengan membuat breakwater tenggelam. Untuk penggunaan armor sebagai bangunan pantai, Hudson (1959) telah mengembangkan koefisien stabilitas KD untuk armor batu. Parameter gelombang yang dilibatkan hanya tinggi gelombang H. Penelitian ini juga mempelajari masalah koefisien stabilitas KD, tapi parameter yang dilibatkan adalah parameter gelombang (H dan T) dan parameter breakwater d/h, sedangkan armor yang digunakan ada 3 jenis armor, yaitu A-jack, tetrapod dan kubus. Studi difokuskan untuk menentukan hubungan antara kecuraman gelombang H/gT2 dan koefisien stabilitas KD, untuk harga parameter d/h tertentu. Hasil penelitian menunjukkan bahwa untuk harga d/h yang sama, maka harga KD(A-jack) lebih besar dari pada KD(tetrapod) dan KD(tetrapod) lebih besar dari pada KD(kubus). Abstract. For beach protection practice, submerged breakwater can reduse the wave height, the wave height can be reduced by constructing submerged breakwater. Hudson (1959) had developed the stability coefficient KD for stone armor, which involve only the wave parameter H for beach protection structure. This research is also studying the stability coefficient KD, but more wave parameters (H,T), and breakwater parameter d/h, and 3 of artificial armor (A-jack, tetrapod and cube). The relation between the wave steepness H/gT2 and the stability coefficient KD for certain parameter d/h is estabilished. The result shows, that for the same value of d/h, KD(A-jack) is greater than KD(tetrapod) and KD(tetrapod) is greater than KD(cube).  
Pemodelan Fisik 2-D untuk Mengukur Tingkat Efektivitas Perforated Skirt Breakwater pada Kategori Gelombang Panjang Andojo Wurjanto; Harman Ajiwibowo; Rahmat Zamzami
Jurnal Teknik Sipil Vol 17 No 3 (2010)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2010.17.3.7

Abstract

Abstrak. Efektifitas pemecah gelombang dapat diukur dengan mengukur koefisien transmisi (KT). Semakin kecil koefisien transmisi maka semakin efektif pemecah gelombang ini. Pengujian model fisik dilakukan untuk mengetahui nilai koefisien transmisi dari Perforated Skirt Breakwater (PSB). Model PSB diuji dalam saluran gelombang 2-D di Laboratorium Gelombang Teknik Kelautan FTSL ITB, untuk mengetahui keefektifannya terhadap kategori gelombang panjang (periode prototipe, Tp = 7 detik). Penskalaan untuk model PSB menggunakan prinsip Keserupaan Froude dimana bilangan Froude model setara dengan bilangan Froude prototipe (Frm=Frp). Saluran gelombang dilengkapi dengan 5 sensor gelombang tipe tahanan listrik dan 8 saluran DAS (Data Acquisition System). Data tinggi gelombang (H) dan periode gelombang (T) diamati secara manual melalui pengamatan visual dan diperoleh melalui rekaman sensor gelombang (yang selanjutnya diproses menggunakan metode "zero mean up-crossing"). Tinggi gelombang datang di depan PSB (Hi) dan tinggi gelombang transmisi di belakang PSB (Ht) diukur dan diproses untuk mendapatkan koefisien transmisi (KT). Selanjutnya, hubungan antara KT dan bilangan tak-berdimensi, kedalaman sirip / tinggi gelombang datang (S/Hi) dianalisis dan nilai koefisien transmisi (KT) untuk berbagai kondisi lingkungan diperoleh. Abstract. The effectiveness of a breakwater can be measured by quantifying the transmission coefficient (KT). The smaller the coefficient, more effective the performance of the breakwater. A physical modeling on the proposed breakwater was conducted to identify the coefficient of Perforated Skirt Breakwater (PSB). The PSB model was tested in 2-D wave flume at Ocean Wave Research Laboratory FTSL ITB, to obtain the effectiveness of PSB for long-period waves (prototype periods, Tp= 7 second). The scaling of PSB models applies the principle of Froude Similarity, where the Froude number in the model equals to the Froude number in prototype (Frm=Frp). The wave flume is equipped with 5 resistance-type wave probes and 8-channels of DAS (Data Acquisition System). Wave heights (H) and wave periods (T) data were observed both manually by visual observation and from wave probes record (processed later with method of "zero mean up-crossing" technique). The incoming  wave heights (Hi) and transmitted wave heights (Ht) - before and after PSB, respectively - were measured and processed to obtain the transmission coefficient (KT). The relationships between KT and non-dimensional variables (skirt draft / incident wave height, S/Hi) are analyzed and the calculated KT for varied environmental condition are obtained.
The Economic and Safety Improvement Feasibility of Urban Ocean Fishing Port Modernization – Study Case of Nizam Zachman Andojo Wurjanto; Julfikhsan Ahmad Mukhti; Aisyah Diah Larasati; Maria Utami Manullang
Journal of Engineering and Technological Sciences Vol. 55 No. 6 (2023)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2023.55.6.5

Abstract

The Nizam Zachman Jakarta Ocean Fishing Port (PPSNZJ), the largest fishing port in Indonesia, is currently experiencing overcapacity. This results in ships being moored in rows parallel to berths, indicating the insufficient number of berths in the port. This configuration poses a safety hazard due to the proximity of the moored ships, making it challenging to evacuate them in the event of a fire or other natural disasters. This study was conducted to propose an alternative concept for facility development in urban ocean fishing ports, with PPSNZJ as a study case. The study included a site visit to understand the actual berthing configuration of ships, data collection from the port technical execution unit, and observation of existing fish cargo handling operations. The collected data was analyzed to determine berth capacity and storage productivity, which was used to calculate the number of additional berths required to accommodate loading, unloading, and mooring ships. Based on the design calculations, an alternative development layout is proposed, which fulfils the berth capacity and safety requirements. This study also revealed that the development cost is relatively competitive compared to similar projects.
Co-Authors Aisyah Diah Larasati Ayuningtyas, Shinta Hadi Kardhana Hang Tuah Hang Tuah Hang Tuah, Hang Harman Ajiwibowo Hijir Della Wirasti Julfikhsan Ahmad Mukhti Julfikhsan Ahmad Mukhti Julfikhsan Ahmad Mukhti Ketut Kinog Ketut Kinog Ketut Kinog, Ketut Krisnaldi Idris Krisnaldi Idris Krisnaldi Idris, Krisnaldi Maria Utami Manullang Mukhti, Julfikhsan Ahmad Mukhti, Julfikhsan Ahmad Putri, Yully Santi Eka Rahmat Zamzami Rahmat Zamzami, Rahmat Shinta Ayuningtyas Widyanintias, Yosinta Eka Wirasti, Hijir Della Yosinta Eka Widyanintias Yudi Lasmana Yully Santi Eka Putri