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Transmisi Gelombang pada Breakwater Tenggelam Kinog, Ketut; Tuah, Hang; Wurjanto, Andojo; Idris, Krisnaldi
Jurnal Teknik Sipil Vol 11, No 3 (2004)
Publisher : Institut Teknologi Bandung

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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 Kinog, Ketut; Tuah, Hang; Wurjanto, Andojo; Idris, Krisnaldi
Jurnal Teknik Sipil Vol 12, No 1 (2005)
Publisher : Institut Teknologi Bandung

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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).Â 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).Â Â

Pemodelan Fisik 2-D untuk Mengukur Tingkat Efektivitas Perforated Skirt Breakwater pada Kategori Gelombang Panjang Wurjanto, Andojo; Ajiwibowo, Harman; Zamzami, Rahmat
Jurnal Teknik Sipil Vol 17, No 3 (2010)
Publisher : Institut Teknologi Bandung

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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 âzero mean up-crossingâ). 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 âzero mean up-crossingâ technique). The incomingÂ 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.

Alternative Designs for Semarang-Demak Coastal Dike and Toll Road Wurjanto, Andojo; Mukhti, Julfikhsan Ahmad; Ayuningtyas, Shinta
Journal of Engineering and Technological Sciences Vol 51, No 3 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Semarang city has been experiencing coastal flooding as a major problem. The flooding is inevitable due to the declining groundwater level as an impact of population growth and groundwater exploitation. The Indonesian Ministry of Public Works and Housing is currently planning to build the Semarang-Demak section of the Northern Java Coastal Tollway not only to fulfill traffic demand but also to fight coastal flooding. The purpose of this paper is to present alternative designs to support the plan and to provide recommendations based on design analyses as well as concerns from past design experiences. To the degree that is allowed by the available secondary data, reasonably detailed engineering calculations were performed to be able to present the dimensions of each alternative structure. The results of the structural and geotechnical analyses were obtained using suitable software for each type of analysis and the concerns based on past design experiences were investigated to find the most effective and efficient alternative.

Tata Cara Perencanaan Teknik Jaringan Irigasi Rawa (Hal. 48-59) Putri, Yully Santi Eka; Wurjanto, Andojo
RekaRacana: Jurnal Teknil Sipil Vol 2, No 1: Maret 2016
Publisher : Institut Teknologi Nasional, Bandung

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 tugas akhir 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.Â 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.

EXTREME SIGNIFICANT WAVE HEIGHT OF WESTERN AND CENTRAL INDONESIAN SEAS AND ITS CORRELATION WITH ISO 19901-1:2015 Wurjanto, Andojo; Mukhti, Julfikhsan Ahmad; Wirasti, Hijir Della; Widyanintias, Yosinta Eka
Journal of Engineering and Technological Sciences Vol 52, No 3 (2020)
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.2020.52.3.3

Extreme significant wave height is a commonly used parameter for designing offshore structures. ISO provides general extreme significant wave height information of six ocean regions in the world, including the Southern East Asian Sea. However, for the case of Indonesia, ISO only includes the Natuna Sea region. One of the qualified datasets that provide significant wave height data for Indonesian seas is SEAFINE by Oceanweather, Inc. This dataset covers the western and middle part of Indonesia. We analyzed the SEAFINE significant wave height hindcast data in these regions to obtain the extreme values. Extreme significant wave height maps were then produced based on the analyzed data. For the purpose of validation, we compared the extreme value analysis result with ISO 19901-1:2015 in regions where SEAFINE and ISO data intersect. The comparison showed that the analysis result tends to give approximately 25% lower wave height for a 1-year return period compared to ISO 19901-1:2015 but agreement for a 100-year return period. The SEAFINE analysis result also shows agreement with previous studies in the Karimata Strait and the Java Sea.

Analisis Hidrodinamika di Perairan Lemong, Kabupaten Lampung Barat, Provinsi Lampung Menggunakan Piranti Surface-Water Modeling System Wurjanto, Andojo; Ajiwibowo, Harman
Rekayasa Vol 13, No 2: August 2020
Publisher : Universitas Trunojoyo Madura

Pantai Lemong merupakan bagian dari Kawasan Pantai Pesisir Barat, Provinsi Lampung yang berpotensi terkena abrasi akibat gelombang dari Samudera Hindia. Rencana pengamanan pantai diperlukan untuk mencegah abrasi. Studi ini dilakukan untuk mengidentifikasi karakteristik pasang surut dan arus di perairan Lemong sebagai parameter untuk perencanaan pengaman pantai. Analisis pasang surut dan arus dilakukan dengan pemodelan numerik pada modul RMA2 dari perangkat lunak Surface-Water Modeling System (SMS). Data yang digunakan pada pemodelan adalah batimetri dan elevasi pasang surut setempat yang didapatkan dari hasil survei. Pemodelan dilakukan dengan metode online nesting dengan empat tingkat resolusi grid dengan resolusi tertinggi pada 1 x 1 km2 saat mendekat ke Perairan Pantai Lemong. Hasil pemodelan divalidasi dengan data lapangan berupa elevasi pasang surut pada dua titik di perairan dangkal dan tiga titik di perairan dalam. Hasil pemodelan menunjukkan bahwa tunggang pasang surut di wilayah Pantai Lemong mencapai 1,4 m dengan tipe mixed – dominan semi diurnal. Hasil pemodelan juga menunjukkan pola arus di Perairan Lemong yang memiliki arah dominan menuju Tenggara saat pasang dan menuju Barat Laut saat surut. Untuk pengembangan model berikutnya, disarankan agar menyertakan data kecepatan arus hasil survei lapangan dalam proses validasi sehingga kesesuaian hasil pemodelan dengan lapangan dapat lebih ditingkatkan.Hydrodynamic Analysis Using Surface-water Modeling System in Lemong Waters, West Lampung Regency, Lampung ProvinceLemong Beach is part of the western coast of Lampung Province which is prone to abrasion caused by the Indian Ocean waves. This study aims to identify the tidal and current characteristics in Lemong waters as a part of coastal protection planning. The tidal analysis is performed by using the RMA2 module from Surface-Water Modeling System (SMS). Data utilized in the model including bathymetry and local tidal elevations from field surveys. Modeling is conducted using an online nesting method utilizing four stages of grid resolution with 1 x 1 km2 as the highest used around the Lemong Beach Waters. The model is validated with the tidal elevations measured in two points in shallow water and three points in deep water areas. The modeling result shows that the tidal range of Lemong Beach Waters is approximately 1.4 meters as a mixed tide, dominantly in semi-diurnal. The model also shows that the current pattern in Lemong Beach Waters is dominantly moving towards southeast during flows and towards northwest during ebbs. Modeling can be further improved by including current speed from field measurement in the validation process.

Aplikasi Sobek Untuk Simulasi Kegagalan Tanggul Laut: Studi Kasus Pluit-Jakarta Yudi Lasmana; Andojo Wurjanto; Hadi Kardhana
JURNAL TEKNIK HIDRAULIK Vol 4, No 2 (2013): JURNAL TEKNIK HIDRAULIK
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Pluit terletak di pantai utara Jakarta, dan secara topografis areanya berada di bawah permukaan air laut. Hal ini menyebabkan Pluit sangat rentan terhadap bencana banjir air pasang besar (ROB), dan kondisi tersebut diperparah dengan fenomena penurunan tanah dan kenaikan muka air laut. Saat ini sistem polder digunakan untuk membuang kelebihan air di Pluit. Luas daerah tangkapan air Pluit 2.083 ha, yang meliputi daerah penting dan sensitif seperti Monas dan Istana Negara. Tujuan dari studi ini adalah membangun kewaspadaan terhadap ancaman banjir ROB di Pluit dan memberikan solusi bagaimana untuk mencegah bencana tersebut. Software SOBEK digunakan untuk melakukan simulasi skenario banjir pasang surut akibat kegagalan tanggul laut. Hasil simulasi skenario kegagalan tanggul laut dengan lebar 100m dan level tanggul yang tersisa pada 0 (nol) m Peil Priok (mPP) maka dalam waktu 5 hari daratan akan satu level dengan laut, yang mencapai titik terjauh di Kel. Kebon Kelapa, Kec. Gambir, Jakarta Pusat (kurang lebih 6,4 km dari laut). Tinggi stasiun pompa harus berada di level +3,069 mPP berdasarkan penurunan tanah 5 tahun dan tinggi jagaan 1m. Tinggi tanggul laut harus didesain berdasarkan layanan 5 tahun di level +2,808 mPP.

Alternative Designs for Semarang-Demak Coastal Dike and Toll Road Andojo Wurjanto; Julfikhsan Ahmad Mukhti; Shinta Ayuningtyas
Journal of Engineering and Technological Sciences Vol. 51 No. 3 (2019)
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.2019.51.3.3

Semarang city has been experiencing coastal flooding as a major problem. The flooding is inevitable due to the declining groundwater level as an impact of population growth and groundwater exploitation. The Indonesian Ministry of Public Works and Housing is currently planning to build the Semarang-Demak section of the Northern Java Coastal Tollway not only to fulfill traffic demand but also to fight coastal flooding. The purpose of this paper is to present alternative designs to support the plan and to provide recommendations based on design analyses as well as concerns from past design experiences. To the degree that is allowed by the available secondary data, reasonably detailed engineering calculations were performed to be able to present the dimensions of each alternative structure. The results of the structural and geotechnical analyses were obtained using suitable software for each type of analysis and the concerns based on past design experiences were investigated to find the most effective and efficient alternative.

Extreme Significant Wave Height of Western and Central Indonesian Seas and Its Correlation with ISO 19901-1:2015 Andojo Wurjanto; Julfikhsan Ahmad Mukhti; Hijir Della Wirasti; Yosinta Eka Widyanintias
Journal of Engineering and Technological Sciences Vol. 52 No. 3 (2020)
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.2020.52.3.3

Extreme significant wave height is a commonly used parameter for designing offshore structures. ISO provides general extreme significant wave height information of six ocean regions in the world, including the Southern East Asian Sea. However, for the case of Indonesia, ISO only includes the Natuna Sea region. One of the qualified datasets that provide significant wave height data for Indonesian seas is SEAFINE by Oceanweather, Inc. This dataset covers the western and middle part of Indonesia. We analyzed the SEAFINE significant wave height hindcast data in these regions to obtain the extreme values. Extreme significant wave height maps were then produced based on the analyzed data. For the purpose of validation, we compared the extreme value analysis result with ISO 19901-1:2015 in regions where SEAFINE and ISO data intersect. The comparison showed that the analysis result tends to give approximately 25% lower wave height for a 1-year return period compared to ISO 19901-1:2015 but agreement for a 100-year return period. The SEAFINE analysis result also shows agreement with previous studies in the Karimata Strait and the Java Sea.

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