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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Journal of Marine Research Journal of Engineering and Technological Sciences Jurnal Teknik Sipil BULLETIN OF THE MARINE GEOLOGY Jurnal Segara JURNAL TEKNIK HIDRAULIK Bulletin of Geology
Totok Suprijo
KK Oseanografi, Fakultas Ilmu Dan Teknologi Kebumian, Institut Teknologi Bandung
Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology

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Modification of Attenuation Rate in Range Normalization of Echo Levels for Obtaining Frequency-dependent Intensity Data from 0.6MHz and 1.0MHz Devices Poerbandono, R.; Suprijo, Totok
Journal of Engineering and Technological Sciences Vol 45, No 2 (2013)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (457.688 KB) | DOI: 10.5614/j.eng.technol.sci.2013.45.2.3

Abstract

This investigation aims to propose an attenuation rate for range normalization of echo amplitudes recorded by an acoustic backscattering instrument working at a frequency of 1.0 MHz. The intention of the use of such an attenuation rate is to obtain equal echo levels when using a device from the same family of products with a different working frequency, i.e. a 0.6 MHz instrument, at an identical site. This work is based on a field experiment with a 1.0 MHz Acoustic Wave and Current (AWAC) profiler and a 0.6 MHz Aquadopp profiler. Both profilers were deployed upward, side-by-side in the Semak Daun reef lagoon, Seribu Islands, Java Sea, Indonesia. It was found that the proposed attenuation rate for the 1.0 MHz instrument was one-order magnitude higher with respect to the one used for the 0.6 MHz instrument, and logarithmically depth dependent. The proposed attenuation rate for the 1.0 MHz AWAC is –7.925log(R) + 8.551, with R is the slant range from the transducers to the measured layer. Accordingly, the overall agreement between the 1.0 MHz AWAC echo amplitude and the one recorded by the 0.6 MHz Aquadopp was improved by 18dB, which is quite significant considering that the average echo amplitude discrepancy recorded by each transducer was 2.4dB.
Modification of Attenuation Rate in Range Normalization of Echo Levels for Obtaining Frequency-dependent Intensity Data from 0.6MHz and 1.0MHz Devices R. Poerbandono; Totok Suprijo
Journal of Engineering and Technological Sciences Vol. 45 No. 2 (2013)
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.2013.45.2.3

Abstract

This investigation aims to propose an attenuation rate for range normalization of echo amplitudes recorded by an acoustic backscattering instrument working at a frequency of 1.0 MHz. The intention of the use of such an attenuation rate is to obtain equal echo levels when using a device from the same family of products with a different working frequency, i.e. a 0.6 MHz instrument, at an identical site. This work is based on a field experiment with a 1.0 MHz Acoustic Wave and Current (AWAC) profiler and a 0.6 MHz Aquadopp profiler. Both profilers were deployed upward, side-by-side in the Semak Daun reef lagoon, Seribu Islands, Java Sea, Indonesia. It was found that the proposed attenuation rate for the 1.0 MHz instrument was one-order magnitude higher with respect to the one used for the 0.6 MHz instrument, and logarithmically depth dependent. The proposed attenuation rate for the 1.0 MHz AWAC is "“7.925log(R) + 8.551, with R is the slant range from the transducers to the measured layer. Accordingly, the overall agreement between the 1.0 MHz AWAC echo amplitude and the one recorded by the 0.6 MHz Aquadopp was improved by 18dB, which is quite significant considering that the average echo amplitude discrepancy recorded by each transducer was 2.4dB.
Opak and Bogowonto Coastal Inlet Sand Spit Morphodynamics using Landsat and Sentinel Satellite Images Rizal Fadlan Abida; Totok Suprijo; Budhy Soeksmantono
Jurnal Segara Vol 18, No 3 (2022): December
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i3.11918

Abstract

Sand spits are elongated sand deposits on the beach that often form at the inlet or the headland’s tip. The hydrodynamics of the river flow, waves, storm surge, and tide affect the sand spit formation, which was created by the longshore transport along the coast. Bogowonto and Opak inlets are located in southern coastal Java facing directly to the Indian ocean where micro-tidal, waves, and river flow affecting both inlets, are chosen for this case study. Morphodynamics analysis of sand spit using Landsat 7 and 8, Sentinel 2 image from 2000 to 2020, coastline identification using Modified Normalized Different Water Index (mNDWI). In November 2007 and October 2013, Opak Inlet migratory routes were detected, and closures related to the east season occurred at both of them. Inlet tend to close occur on east season during July until November.
Pengembangan Awal Formula Empiris Berbasis Proses Penyebaran Sedimen Tersuspensi Di Perairan Pesisir Tanara Delilla Suhanda; Totok Suprijo; Budhy Soeksmantono
Journal of Marine Research Vol 12, No 2 (2023): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v12i2.35692

Abstract

Transport sedimen tersuspensi adalah salah satu proses yang terjadi di wilayah pesisir khususnya estuari. Tujuan dari penelitian ini adalah mengetahui algoritma pengukuran konsentrasi sedimen tersuspensi menggunakan data citra Landsat yang sesuai untuk Perairan Tanara berdasarkan pengukuran in-situ. Metode purposive sampling dipilih untuk menentukan lokasi sampling di enam stasiun pada tanggal 10 April 2012. Pengambilan sampel dilakukan menggunakan bottle sampler (botol Nansen) secara langsung pada kedalaman 0,2d. Pengolahan sampel lapangan diolah dengan metode SNI 03-3961-1995 untuk mengetahui jumlah berat sedimen melayang dalam air. Selanjutnya pengolahan data citra satelit menggunakan Landsat 8 dilakukan dengan koreksi radiometrik, atmosferik, dan aplikasi algoritma sedimen tersuspensi yang telah dikembangkan oleh Budhiman (2004) untuk mengetahui hasil yang paling mendekati nilai data lapangan dari ketiga algoritma tersebut. Dari hasil pengolahan data dan analisa validasi menggunakan Root Mean Square Error (RMSE) dari data in-situ dengan ketiga algoritma tersebut bernilai 16,85. Setelah dilakukan modifikasi algoritma yang dikembangkan oleh Budhiman (2004) nilai RMSE menjadi 8,61. Modifikasi algoritma diaplikasikan pada data citra dari tahun 2013–2015. Sebaran konsentrasi sedimen tersuspensi di Perairan Tanara yang dipengaruhi dominan oleh aliran debit sungai. Suspended sediment transport is one process that occurs in coastal areas, especially estuaries. This study aimed to determine the algorithm for measuring suspended sediment concentration using Landsat imagery data that was suitable for Tanara Waters based on in-situ measurements. The purposive sampling method was chosen to determine sampling locations at six stations on April 10, 2012. Sampling was carried out using a bottle sampler (Nansen bottle) directly at a depth of 0.2d. Field samples were processed using the SNI 03-3961-1995 method to determine the water's total weight of suspended sediment. Furthermore, the processing of satellite image data using Landsat 8 is carried out with radiometric correction, atmospheric correction, and the application of the suspended sediment algorithm that has been developed by Budhiman (2004)) to find out the results that are closest to the value. Field data from the three algorithms. From the data processing and validation analysis results using the Root Mean Square Error (RMSE) from in-situ data with the three algorithms, the value is 16.85. After modification of the algorithm developed by Budhiman (2004), the RMSE value became 8.61. Algorithm modification was applied to image data from 2013 – 2015. Spontaneous sediment concentration distribution in Tanara Waters is influenced by river flow.
IDENTIFIKASI PERUBAHAN GARIS PANTAI MENGGUNAKAN PERANGKAT COASTSAT, STUDI KASUS SEGMEN PANTAI NUSA DUA, BALI Ima Nurmalia Permatasari; Totok Suprijo; Budhy Soeksmantono
JURNAL TEKNIK HIDRAULIK Vol 14, No 1 (2023): JURNAL TEKNIK HIDRAULIK
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v14i1.719

Abstract

ABSTRACTNusa Dua Beach, Bali, is morphologically dynamic because it is constantly changing due to erosion and accretion. In 2003, the efforts were made to develop groins, where this one of the solutions to overcome erosion. Analysis of shoreline changes needs to be carried out to see the effectiveness of groin development by looking at the shoreline before and after construction using Landsat imagery data for 26 years. This research method utilizes the Modified Normalized Difference Water Index (MNDWI) algorithm to separate water from land features, classify images into four classes: sand, water, foam, and land features using the Coastsat toolkit and calculate wave energy flux. Before the construction, The GA1-GA2 groins experienced successive erosion in 1996-2002. After construction of the coastal groins, it still shows a decline in the coastline both during the west monsoon, which is 63.68 m and the east monsoon which is 36.21 m. In the east monsoon, the wave energy flux is most significant, with a maximum value of 4.9 x 10³ N/s, and in the west monsoon 3.4 x 10³ N/s. The effect of the significant wave energy flux that occurs in the east monsoon causes more longshore sediment transport, and the coast experiences a maximum shoreline advance in the east monsoon of 65.24 m compared of the west monsoon shoreline, which is 58.28 m. The toolkit can identify with better accuracy by validating estimation and observation data with an RMSE value of 4.79 m, a bias of 2.62 m, and an R2 of 0.97.Keywords: Shoreline, Erosion, Landsat, Wave Energy Flux  ABSTRAKPantai Nusa Dua, Bali dapat dikatakan secara morfologi dinamis dikarenakan selalu mengalami perubahan akibat erosi dan akresi. Tahun 2003 telah dilakukan upaya pembangunan groin yang merupakan salah satu solusi untuk menanggulangi terjadinya erosi. Analisis perubahan garis pantai perlu dilakukan untuk melihat efektivitas dari pembangunan groin dengan melihat garis pantai sebelum dan sesudah pembangunan dengan memanfaatkan data citra Landsat selama 26 tahun. Metode penelitian ini memanfaatkan algoritma Modified Normalized Difference Water Index (MNDWI) untuk memisahkan air dari fitur daratan, mengklasifikasi citra menjadi empat kelas: pasir, air, buih dan fitur lahan dengan menggunakan toolkit Coastsat serta menghitung fluks energi gelombang. Sebelum pembangunan groin GA1-GA2, pantai mengalami erosi pada tahun 1996-2002. Setelah pembangunan groin pantai masih menunjukkan terjadi kemunduran garis pantai pada saat musim barat 63,68 m maupun musim timur 36,21 m. Pada musim timur fluks energi gelombang terbesar dengan nilai maksimum 4,9 x 10³ N/s dan pada musim barat fluks energi maksimum yaitu sebesar 3,4 x 10³ N/s  Efek dari besarnya fluks energi gelombang yang terjadi di musim timur menyebabkan angkutan sedimen sejajar pantai lebih besar dan pantai mengalami kemajuan garis pantai maksimum di musim timur 65,24 m dibandingkan dengan musim barat 58,28 m. Toolkit coastsat mampu mengindentifikasi garis pantai lebih efisien dengan ketelitian lebih baik dengan validasi data estimasi dan observasi bernilai RMSE 4,79 m, bias 2,62 m dan R2 0,97.Kata Kunci: Garis Pantai, Erosi, Landsat, Fluks Energi Gelombang
Pemodelan Sebaran dan Waktu Tinggal Limbah Panas di Teluk Bontang Suprijo, Totok; Romawan, Francis Seravino; Nur, Ashadi Arifin; Mandang, Idris; Napitupulu, Gandhi
Jurnal Teknik Sipil Vol 31 No 3 (2024): Jurnal Teknik Sipil - Edisi Desember
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.3.9

Abstract

Abstract The water mass exchange process between a bay and an open sea can flush effluents or pollutants that enter the bay. This paper describes a two-dimensional numerical modelling study on thermal water dispersion due to hydrodynamic processes in The Bontang Bay and the bay flushing capability. The numerical model used is Delft3D. Model input data was including bathymetry, water elevation, discharge of seawater intake and outfall, wind speed, and temperature of the thermal water effluent discharged into Bontang Bay. The modelling results were verified with observation data. Verification results shows that error of water elevation is 0.07 m, while current speed error is 0.26 m/s. Dispersion modeling results indicate that 40°C thermal water discharged at a rate of 24.6 m³/s into Bontang Bay has increased the water temperature in the bay by 1°C to 2°C. This increase in temperature potentially has a negative impact on aquatic ecosystems. An increase in water temperature of 1°C and 2°C covers areas of 19.32 km² and 7.26 km² in the bay, respectively. The residence time of thermal water in Bontang Bay is 3 days and 12 hours before flushing. Keywords: Thermal dispersion, exchange process, residence time, flushing time
ANALISIS PERUBAHAN GARIS PANTAI AKIBAT PEMBANGUNAN JETTY DI WILAYAH PANTAI KARANGSONG, INDRAMAYU, INDONESIA Abdurrahman, Umar; Ningsih, Nining Sari; Suprijo, Totok; Tarya, Ayi
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2021.5.2.5

Abstract

Pada tahun 2005 dilakukan pembangunan jetty di muara Sungai Prajagumiwang, tepatnya di Pantai Karangsong, Desa Karangsong, Kecamatan Indramayu, Kabupaten Indramayu, JawaBarat. Pembangunan jetty ini merupakan salah satu solusi dari permasalahan pendangkalan alur pelayaran di wilayah tersebut. Selain berdampak pada aktivitas perikanan setempat, pembangunan jetty ini juga berdampak pada perubahan garis pantai di Pantai Karangsong. Pada penelitian ini, analisis perubahan garis pantai dilakukan dengan memanfaatkan data citra satelit dari Google Earth yang terdiri daritahun 2001, 2008, 2009. 2013, 2014, 2015, 2016, dan 2017. Garis air tinggi dipilih sebagai indikator penentu garis pantai dengan tujuan untuk meminimalisir kesalahan yang dapat terjadi akibat penentuan garis pantai secara manual. Hasil analisis secara kualitatif dan kuantitatif menunjukkan adanya pola perubahan garis pantai yang semula didominasi oleh terjadinya erosi, setelah pembangunan jetty berubah menjadi didominasi oleh akresi. Berdasarkan analisis perubahan luas dan garis pantai yang dilakukan pada penelitian ini, perubahan luas pantai dan garis pantai terbesar terjadi pada periode 2001 –2008 yaitu sebesar 297.136 m2dan 13.897 m. Pada periode 2008 –2017 nilai perubahan luas dan garis pantai menunjukkan kondisi yang berubah ubah dan perubahannya semakin mengecil. Hal ini menunjukkan Pantai Karangsong mengalami proses pantai menuju setimbang. Kata kunci:Perubahan garis pantai, pembangunan jetty, Pantai Karangsong, Google Earth
Transformasi Gelombang Reguler Akibat Pemecah Gelombang Tiang Pancang Dua Baris Selang-Seling Suprijo, Totok; Napitupulu, Gandhi; Ginting, Juventus W.R.; Simanjuntak, Eduardo M.; Abdullah, Faizal A.R.; Khadami, Faruq
JURNAL TEKNIK HIDRAULIK Vol 15, No 2 (2024): JURNAL TEKNIK HIDRAULIK
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v15i2.787

Abstract

Hydraulic experiments in a two-dimensional physical laboratory were conducted to evaluate the performance of pile breakwaters in reducing wave energy. The piles on the breakwater were arranged in a staggered pattern in two rows. A total of seventy-two simulation scenarios were run based on variations in the incoming wave height and period, and the spacing between the piles, using a 1:10 model scale. The data from the hydraulic tests were then processed using a spectral method that could separate the energy spectra of reflected and transmitted waves. These changes result in reflected and transmitted waves. The laboratory test data were used to estimate the values of the transmission coefficient and reflection coefficient. Both coefficients were then used to validate semi-empirical formulas for the two coefficients. The semi-empirical formulas for the two coefficients were developed based on a model for estimating the spatial porosity of pile breakwaters. The porosity estimation model takes into account the dimensions of the piles and the dimensional components of the breakwater, including the arrangement, number of rows, and spacing between the piles. The validation results of the semi-empirical formulas with the laboratory test data showed a coefficient of determination of 0.917 and a root mean square of 0.077. The staggered arrangement improves the effectiveness of the breakwater in reducing the transmission wave height. The developed semi-empirical model can be used to design the pile dimensions to achieve optimal reflected and transmitted wave heights for coastal protection. Keywords:  pile breakwater, coastal protection, hydraulic experiment, physical wave simulation, wave transmission new formula
SEASONAL AND INTRA-SEASONAL VARIABILITY OF OCEAN THERMAL POTENTIAL ENERGY IN THE INDONESIAN EXCLUSIVE ECONOMIC ZONE Suprijo, Totok; Napitupulu, Gandhi; Ningsih, Nining Sari; Sinaga, Denny Basardo Jonatan; Rachman, Audi
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 1 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.1.2024.866

Abstract

Ocean thermal energy is a promising marine renewable energy resource that can be developed as a clean energy alternative for Indonesia, which is in the equatorial or tropical region. This study assesses the potential of ocean thermal energy as a renewable energy source in the Indonesian Exclusive Economic Zone (EEZ) by estimating the monthly, seasonal, and intra-seasonal variability of ocean thermal energy conversion (OTEC) resources. The Indonesian EEZ spans from 6°N to 11°S and 95°E to 139°E, covering an area of 3,495,698.72 km². Using temperature data from simulations of the Hybrid Coordinate Ocean Model (HYCOM), the study evaluates the potential of OTEC resources over a 50-year period (from January 1964 to December 2013) with a spatial resolution of 0.125°. Estimation of OTEC potential power resources was based on temperature differences at depths of 20 m and 1000 m, following the hybrid cycle working principle.The results of the estimations indicate that the area has a monthly average potential power of 289.73 GW. The estimation also reveals seasonal and intra-seasonal variability in this potential energy, with fluctuations ranging from 280.09 GW in August to 295.65 GW in December, influenced by phenomena such as ENSO (El Niño Southern Oscillation) and IOD (Indian Ocean Dipole). In the Indonesian EEZ, the average potential thermal power decreases to 288.23 GW during an El Niño event and increases to 291.72 GW during a La Niña event. The IOD phenomenon has a similar effect, with potential decreasing to 281.82 GW during a positive IOD event and rising to 292.64 GW during a negative IOD event.
Kajian Perilaku Gelombang Akibat Adanya Struktur Tiang Pancang Silinder melalui Analisis Spektrum Energi: Study of Wave Behavior due to Cylinder Pile Structure Through Energy Spectrum Analysis Suprijo, Totok; Khadami, Faruq; Abdullah, Faizal Ade R.; Sesami, Hening; Poerbandono; Prasetyo, Adi; Ginting, Juventus; Simanjuntak, Eduardo; Napitupulu, Gandhi
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 15 No. 1 (2023): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v15i1.42612

Abstract

Struktur pemecah gelombang banyak dimanfaatkan untuk perlindungan pantai dari hantaman gelombang laut yang berpropagasi ke daerah pesisir pantai. Salah satu inovasi pemecah gelombang yang sedang dikembangkan yaitu struktur tiang pancang. Tiang pancang merupakan replikasi batang pohon bakau yang dapat meredam energi gelombang. Tujuan dalam penelitian ini untuk menganalisis efektivitas struktur tiang pancang dengan menganalisis perilaku gelombang sebelum dan sesudah bertabrakan dengan struktur tiang pancang berdasarkan pembagian teori gelombang. Simulasi laboratorium fisik telah dilakukan untuk mendapatkan data gelombang yang berinteraksi dengan struktur tiang pancang. Selanjutnya, dilakukan analisis spektrum energi untuk menentukan spektrum energi gelombang datang, refleksi dan transmisi dari pengukuran wave probe berupa data time series. Masing-masing spektrum energi digunakan untuk melihat kemampuan refleksi dan transmisi dari struktur tiang pancang dari koefisien refleksi dan transmisi. Nilai koefisien refleksi dan transmisi diestimasi dengan persamaan polinomial derajat tiga menghasilkan dan dengan variabel parameter dasar gelombang yaitu tinggi gelombang, periode gelombang dan kedalaman perairan. Titik kritis dari persamaan polinomial menunjukkan nilai koefisien refleksi dan transmisi minimum ketika berada pada daerah Cnoidal dan maksimum ketika berada pada daerah Stokes orde-2.
Co-Authors Abdullah, Faizal A.R. Abdullah, Faizal Ade R. Abdurrahman, Umar Adi Prasetyo Ayi Tarya Delilla Suhanda Faruq Khadami Ginting, Juventus Ginting, Juventus W.R. Idris Mandang, Idris Ima Nurmalia Permatasari Napitupulu, Gandhi Nining Sari Ningsih Nur, Ashadi Arifin Poerbandono Poerbandono Rachman, Audi Rizal Fadlan Abida Romawan, Francis Seravino Sesami, Hening Simanjuntak, Eduardo Simanjuntak, Eduardo M. Sinaga, Denny Basardo Jonatan Soeksmantono, Budhy