Articles
<![CDATA[Set Up and Calibration of a Spatial Tool for Simulating River Discharge of Western Java in Recent Decades: Preliminary Results and Assessments ]]>
<![CDATA[Poerbandono, Poerbandono]]>;
<![CDATA[Ward, Philip J.]]>;
<![CDATA[Julian, Miga M.]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol 41, No 1 (2009) ]]>
Publisher : <![CDATA[ITB Journal Publisher, LPPM ITB ]]>
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DOI: 10.5614/itbj.eng.sci.2009.41.1.4
<![CDATA[This paper discusses a study of the application of global spatiotemporal climate datasets and the hydrological model STREAM  (Spatial Tools for River Basin Environmental Analysis and Management Options). In the study, set up and calibration of STREAM for the reconstruction of monthly discharge for several locations in the western part of Java, Indonesia, for the period 1983 -2002 are carried out. The set up includes the preparation of monthly precipitation and temperature datasets, a digital elevation model of the domain being studied, and maps of land cover and soil water holding capacity. Discharge observations from six stations located mostly in the upper parts of major watersheds in the domain are used to calibrate the model by comparing simulated and observed discharge variables. The model performs reasonably well. Comparison between computed and observed mean monthly discharges yield correlation coefficients ranging from 0.72 to 0.93. The computed mean annual discharge in five out of six observation stations ranges between -8 and 5% with respect to the mean annual observed discharge. This study offers a tool which can be used for reconstructing historical discharge]]>
<![CDATA[Modification of Attenuation Rate in Range Normalization of Echo Levels for Obtaining Frequency-dependent Intensity Data from 0.6MHz and 1.0MHz Devices ]]>
<![CDATA[Poerbandono, R.]]>;
<![CDATA[Suprijo, Totok]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol 45, No 2 (2013) ]]>
Publisher : <![CDATA[ITB Journal Publisher, LPPM ITB ]]>
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DOI: 10.5614/j.eng.technol.sci.2013.45.2.3
<![CDATA[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 â7.925log(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.]]>
<![CDATA[Spatial Modeling of Sediment Transport over the Upper Citarum Catchment ]]>
<![CDATA[Poerbandono, Poerbandono]]>;
<![CDATA[Basyar, Ahmad]]>;
<![CDATA[Harto, Agung B.]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol 38, No 1 (2006) ]]>
Publisher : <![CDATA[ITB Journal Publisher, LPPM ITB ]]>
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DOI: 10.5614/itbj.eng.sci.2006.38.1.2
<![CDATA[This paper discusses set up of a spatial model applied in Geographic Information System (GIS) environment for predicting annual erosion rate and sediment yield of a watershed. The study area is situated in the Upper Citarum Catchment of West Java. Annual sediment yield is considered as product of erosion rate and sediment delivery ratio to be modelled under similar modeling tool. Sediment delivery ratio is estimated on the basis of sediment resident time. The modeling concept is based on the calculation of water flow velocity through sub-catchment surface, which is controlled by topography, rainfall, soil characteristics and various types of land use. Relating velocity to known distance across digital elevation model, sediment resident time can be estimated. Data from relevance authorities are used. Bearing in mind limited knowledge of some governing factors due to lack of observation, the result has shown the potential of GIS for spatially modeling regional sediment transport. Validation of model result is carried out by evaluating measured and computed total sediment yield at the main outlet. Computed total sediment yields for 1994 and 2001 are found to be 1.96Ã106 and 2.10Ã106tons/year. They deviate roughly 54 and 8% with respect to those measured in the field. Model response due to land use change observed in 2001 and 1994 is also recognised. Under presumably constant rainfall depth, an increase of overall average annual erosion rate of 11% resulted in an increase of overall average sediment yield of 7%.]]>
<![CDATA[Spatial Decision Assistance of Watershed Sedimentation (SDAS): Development and Application ]]>
<![CDATA[Poerbandono, R.]]>;
<![CDATA[Harto, Agung B.]]>;
<![CDATA[Julian, Miga M.]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol 46, No 1 (2014) ]]>
Publisher : <![CDATA[ITB Journal Publisher, LPPM ITB ]]>
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DOI: 10.5614/j.eng.technol.sci.2014.46.1.3
<![CDATA[This paper discusses the development and application of a spatial tool for erosion modeling named Spatial Decision Assistance of Watershed Sedimentation (SDAS). SDAS computes export (yield) of sediment from watershed as product of erosion rate and sediment delivery ratio (SDR). The erosion rate is calculated for each raster grid according to a digital elevation model, soil, rain fall depth, and land cover data using the Universal Soil Loss Equation. SDR calculation is carried out for each spatial unit. A spatial unit is the smallest sub-watershed considered in the model and generated according to the TauDEM algorithm. The size of one spatial unit is assigned by the user as the minimum number of raster grids. SDR is inversely proportional to sediment resident time and controlled by rainfall, slope, soil, and land cover. Application of SDAS is demonstrated in this paper by simulating the spatial distribution of the annual sediment yield across the Citarum watershed in the northwest of Java, Indonesia. SDAS calibration was carried out based on sediment discharge observations from the upper catchment. We considered factors for hillslope flow depth and for actual and effective rainfall duration to fit the computed sediment yield to the observed sediment discharge. The computed sediment yield agreed with the observation data with a 7% mean relative accuracy.]]>
<![CDATA[PENGAMATAN JANGKA PENDEK PERILAKU ARUS DAN KEKERUHAN RELATIF PADA KANAL ANTAR-TERUMBU PASCA-PASANG PERBANI ]]>
<![CDATA[Poerbandono, Poerbandono]]>;
<![CDATA[Djunarsjah, Eka]]>;
<![CDATA[Windupranata, Wiwin]]>
<![CDATA[ GEOMATIKA Vol 26, No 2 (2020) ]]>
Publisher : <![CDATA[Badan Informasi Geospasial in Partnership with MAPIN ]]>
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DOI: 10.24895/JIG.2020.26-2.1071
<![CDATA[Makalah ini membahas perilaku jangka pendek arus dan kekeruhan relatif. Pembahasan didasarkan pada analisis data dari pengamatan lapangan di satu titik pada kedalaman sekitar 30 m. Titik pengamatan terletak di kanal antar-terumbu sekitar 600 m timur laut Pulau Pramuka ke arah Pulau Panggang. Acoustic Doppler Current Profiler (ADCP) berfrekuensi 614,4 kHz digunakan dalam pengukuran selama 25 jam dan 50 menit, sekitar dua hari setelah pasang perbani. ADCP mengukur profil arus dan hamburan balik dengan interval 1 m. Analisis dilakukan dengan menghubungkan saat perubahan kecepatan arus dengan pasut. Selain itu, kekeruhan relatif dihitung dari hamburan balik menggunakan persamaan kalibrasi empiris. Dari analisis, diperoleh korelasi positif antara tunggang pasut dengan kecepatan arus. Kecepatan arus tertinggi (yaitu 0,42 meter per detik) berkorelasi dengan saat air tinggi yang lebih rendah (lower high water). Kecepatan arus terdistribusi secara merata di sepanjang kolom air. Dibandingkan dengan di lapisan bawah, kecepatan arus di lapisan atas meningkat lebih cepat. Kekeruhan relatif yang dihitung dari hamburan balik menunjukkan bahwa material padat tersuspensi lebih banyak terkumpul di lapisan bawah. Peningkatan kekeruhan relatif diidentifikasi terjadi saat air rendah setelah air pasang tinggi (higher high water). Arah gerak arus saling berkebalikan dengan jumlah kejadian yang dua kali lebih banyak dan kecepatan arus yang dua kali lebih kuat ke arah ke arah 33° dibandingkan dengan ke arah 226°.]]>
<![CDATA[Set Up and Calibration of a Spatial Tool for Simulating River Discharge of Western Java in Recent Decades: Preliminary Results and Assessments ]]>
<![CDATA[Poerbandono Poerbandono]]>;
<![CDATA[Philip J. Ward]]>;
<![CDATA[Miga M. Julian]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol. 41 No. 1 (2009) ]]>
Publisher : <![CDATA[Institute for Research and Community Services, Institut Teknologi Bandung ]]>
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DOI: 10.5614/itbj.eng.sci.2009.41.1.4
<![CDATA[This paper discusses a study of the application of global spatiotemporal climate datasets and the hydrological model STREAM (Spatial Tools for River Basin Environmental Analysis and Management Options). In the study, set up and calibration of STREAM for the reconstruction of monthly discharge for several locations in the western part of Java, Indonesia, for the period 1983 -2002 are carried out. The set up includes the preparation of monthly precipitation and temperature datasets, a digital elevation model of the domain being studied, and maps of land cover and soil water holding capacity. Discharge observations from six stations located mostly in the upper parts of major watersheds in the domain are used to calibrate the model by comparing simulated and observed discharge variables. The model performs reasonably well. Comparison between computed and observed mean monthly discharges yield correlation coefficients ranging from 0.72 to 0.93. The computed mean annual discharge in five out of six observation stations ranges between -8 and 5% with respect to the mean annual observed discharge. This study offers a tool which can be used for reconstructing historical discharge]]>
<![CDATA[Spatial Modeling of Sediment Transport over the Upper Citarum Catchment ]]>
<![CDATA[Poerbandono Poerbandono]]>;
<![CDATA[Ahmad Basyar]]>;
<![CDATA[Agung B. Harto]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol. 38 No. 1 (2006) ]]>
Publisher : <![CDATA[Institute for Research and Community Services, Institut Teknologi Bandung ]]>
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DOI: 10.5614/itbj.eng.sci.2006.38.1.2
<![CDATA[This paper discusses set up of a spatial model applied in Geographic Information System (GIS) environment for predicting annual erosion rate and sediment yield of a watershed. The study area is situated in the Upper Citarum Catchment of West Java. Annual sediment yield is considered as product of erosion rate and sediment delivery ratio to be modelled under similar modeling tool. Sediment delivery ratio is estimated on the basis of sediment resident time. The modeling concept is based on the calculation of water flow velocity through sub-catchment surface, which is controlled by topography, rainfall, soil characteristics and various types of land use. Relating velocity to known distance across digital elevation model, sediment resident time can be estimated. Data from relevance authorities are used. Bearing in mind limited knowledge of some governing factors due to lack of observation, the result has shown the potential of GIS for spatially modeling regional sediment transport. Validation of model result is carried out by evaluating measured and computed total sediment yield at the main outlet. Computed total sediment yields for 1994 and 2001 are found to be 1.96×106 and 2.10×106tons/year. They deviate roughly 54 and 8% with respect to those measured in the field. Model response due to land use change observed in 2001 and 1994 is also recognised. Under presumably constant rainfall depth, an increase of overall average annual erosion rate of 11% resulted in an increase of overall average sediment yield of 7%.]]>
<![CDATA[Modification of Attenuation Rate in Range Normalization of Echo Levels for Obtaining Frequency-dependent Intensity Data from 0.6MHz and 1.0MHz Devices ]]>
<![CDATA[R. Poerbandono]]>;
<![CDATA[Totok Suprijo]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol. 45 No. 2 (2013) ]]>
Publisher : <![CDATA[Institute for Research and Community Services, Institut Teknologi Bandung ]]>
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DOI: 10.5614/j.eng.technol.sci.2013.45.2.3
<![CDATA[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.]]>
<![CDATA[Spatial Decision Assistance of Watershed Sedimentation (SDAS): Development and Application ]]>
<![CDATA[R. Poerbandono]]>;
<![CDATA[Agung B. Harto]]>;
<![CDATA[Miga M. Julian]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol. 46 No. 1 (2014) ]]>
Publisher : <![CDATA[Institute for Research and Community Services, Institut Teknologi Bandung ]]>
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DOI: 10.5614/j.eng.technol.sci.2014.46.1.3
<![CDATA[This paper discusses the development and application of a spatial tool for erosion modeling named Spatial Decision Assistance of Watershed Sedimentation (SDAS). SDAS computes export (yield) of sediment from watershed as product of erosion rate and sediment delivery ratio (SDR). The erosion rate is calculated for each raster grid according to a digital elevation model, soil, rain fall depth, and land cover data using the Universal Soil Loss Equation. SDR calculation is carried out for each spatial unit. A spatial unit is the smallest sub-watershed considered in the model and generated according to the TauDEM algorithm. The size of one spatial unit is assigned by the user as the minimum number of raster grids. SDR is inversely proportional to sediment resident time and controlled by rainfall, slope, soil, and land cover. Application of SDAS is demonstrated in this paper by simulating the spatial distribution of the annual sediment yield across the Citarum watershed in the northwest of Java, Indonesia. SDAS calibration was carried out based on sediment discharge observations from the upper catchment. We considered factors for hillslope flow depth and for actual and effective rainfall duration to fit the computed sediment yield to the observed sediment discharge. The computed sediment yield agreed with the observation data with a 7% mean relative accuracy.]]>
<![CDATA[KAJIAN PERILAKU GELOMBANG AKIBAT ADANYA STRUKTUR TIANG PANCANG SILINDER MELALUI ANALISIS SPEKTRUM ENERGI ]]>
<![CDATA[Gandhi Napitupulu]]>;
<![CDATA[Totok Suprijo]]>;
<![CDATA[Faruq Khadami]]>;
<![CDATA[Faizal Ade R. Abdullah]]>;
<![CDATA[Hening Sesami]]>;
<![CDATA[Poerbandono]]>;
<![CDATA[Adi Prasetyo]]>;
<![CDATA[Juventus Ginting]]>;
<![CDATA[Eduardo Simanjuntak]]>
<![CDATA[ Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 15 No. 1 (2023): Jurnal Ilmu dan Teknologi Kelautan Tropis ]]>
Publisher : <![CDATA[Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University ]]>
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DOI: 10.29244/jitkt.v15i1.42612
<![CDATA[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.]]>
