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Perbandingan Beberapa Formula Perhitungan Gerusan di Sekitar Pilar (Kajian Laboratorium) Soeharno, Agung Wiyono Hadi; Soekarno, Indratmo; Egon, Andi
Jurnal Teknik Sipil Vol 13, No 1 (2006)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (742.374 KB)

Abstrak. Sungai adalah salah satu sumberdaya air yang penting bagi kehidupan. Alur sungai ada yang lurus dan ada pula yang berkelok-kelok. Sarana transportasi jalan yang melintasi sungai memerlukan jembatan. Pada jembatan dengan bentang yang relatif lebar, umumnya memerlukan struktur pilar untuk menopangnya. Pilar yang ditanam pada dasar sungai memerlukan kriteria disain sedemikian sehingga bila dasar saluran disekitar pilar jembatan tersebut tergerus, maka gerusan tersebut tidak mencapai kedalaman yang membahayakan kestabilan pilar. Dalam penelitian ini, model pilar dibangun pada model sungai di Laboratorium Uji Model Fisik Hidraulik, Fakultas Tehnik Sipil dan Lingkungan ITB. Kedalaman gerusan lokal yang terjadi pada model diamati untuk berbagai aliran debit yang berbeda. Hasil pengamatan yang didapat dibandingkan dengan hasil hitungan dari beberapa formula. Formula Colorado State University (CSU) adalah formula yang paling mendekati hasil pengamatan.Abstract. River is water resources, which is important for humankind. The morphology of the river might to be straight or to be meander. A highway that cross a river needs a bridge. In the wide river, the bridge needs pillars to support it. Pillars that construct in the river need to have design criteria so that erosion that might be happened would not cause the pillars to be unstable. In this research, models of pillars in the river model were constructed in the Hydraulic Laboratory, Civil Engineering Departement ITB. Local Scours of the pillars were examined in the various discharges.The results were compared with several methods. The method of Colorado State University (CSU) is recomended in calculating the depth of the local scour in the reseach model condition.

Model Hidrodinamika Pasang Surut di Perairan Kepulauan Bangka Belitung Radjawane, Ivonne M.; Saputro, Bagus S.C.; Egon, Andi
Jurnal Teknik Sipil Vol 25, No 2 (2018)
Publisher : Institut Teknologi Bandung

AbstrakDinamika pasang surut di perairan Kepulauan Bangka Belitung dipengaruhi oleh pasang surut (pasut) dari Laut Cina Selatan dari sebelah utara dan Laut Jawa di sebelah selatan, selain itu terdapat juga pengaruh proses lokal akibat perairan dangkal dan selat sempit. Untuk mengetahui pola dan dinamika pasut yang di perairan Bangka Belitung, dilakukan simulasi model numerik delapan komponen pasut (M2, S2, K1, O1, N2, P1, K2, dan Q1) selama 14 hari (4 - 17 Januari 2009). Simulasi menggunakan model DHI MIKE21 Flow FM, yaitu model hidrodinamika dua dimensi horisontal dengan skema mesh fleksibel. Syarat batas model diperoleh dari Oregon State University Tidal Inversion Software (OTIS) yang dikenal sebagai program Tidal Model Driver (TMD. Hasil dari simulasi model divalidasi terhadap data lapangan pada enam stasiun Babel Ocean Observation and Technologies (BOOST) Center. Hasil simulasi model menunjukkan bahwa pola pasang surut di perairan Kepulauan Bangka Belitung didominasi oleh tipe harian tunggal (diurnal) dengan komponen pasang surut K1 yang terbesar kemudian diikuti oleh komponen O1. Hasil simulasi model juga menunjukkan bahwa dinamika pasang surut pada perairan Bangka Belitung dipengaruhi oleh dinamika Laut Cina Selatan yang memiliki pola pasang surut harian tunggal (diurnal), dimana komponen terbesar K1 terdispersi dari Laut Cina Selatan menuju Selat Karimata dan perairan Bangka Belitung.AbstractTidal dynamics in Bangka Belitung Archipelago waters is influenced by the tidal from South China Sea from the north, the Java Sea from the south, and local processes due to shallow water and narrow strait. To understand the tidal dynamics in Bangka Belitung waters, a numerical model has been simulated with 8 major tidal constituents (M2, S2, K1, O1, N2, P1, K2, and Q1) for a period of 14 days (4 to 17 January 2009). The simulation was carried out using DHI’s MIKE 21 Flow FM software, a 2-dimension flexible mesh hydrodynamic model. The model boundary conditions were obtained from the Oregon State University Tidal Inversion Software (OTIS), also known as the Tidal Model Driver (TMD). The model has been validated against measurement in six stations of BOOST Center (Babel Ocean Observation and Technologies). The simulation results show that the tidal dynamic in Bangka Belitung waters is dominated by diurnal tidal constituent, with K1 is the largest tidal constituent then followed by O1. The result also indicates that the tidal dynamic in Bangka Belitung waters is dominated influenced by the diurnal constituents K1 coming from the South China Sea dispersed towards the Karimata Strait and Bangka Belitung water.

Tidal Current Energy Resources Assessment in the Patinti Strait, Indonesia Novico, Franto; Sudjono, Evi Hadrijantie; Egon, Andi; Menier, David; Methew, Manoj; Pratama, Munawir Bintang
International Journal of Renewable Energy Development Vol 10, No 3 (2021): August 2021
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2021.35003

Indonesia is currently intensively developing its renewable energy resource and targets at least 23% by 2025. As an archipelago country, Indonesia has the potential to benefit from its abundant renewable energy resources from its offshore regions. However, the short tidal range of mixed semi-diurnal and the suitable tidal turbine capacity may hinder marine renewable energy development in Indonesian waters. This paper presents higher-order hydrodynamic numerical models to provide spatial information for tidal current resource assessment of the Patinti Strait. The present study applied the hydrographic and oceanographic method to produce input of the numerical model. Based on the selected simulation analysis, the highest current speed could be identified around Sabatang and Saleh Kecil Island with up to 2.5 m/s in P1 and 1.7 m/s in P4. Besides, the operational hours for the two observation points are 69% and 74.5%, respectively. The results indicate that this location is of prime interest for tidal turbine implementation as an energy source, for medium capacity (300 kW) and high capacity (1Â MW).

Hydrodynamic Modelling of Tidally-Influenced Fluvial Zone, a study case of Palembang, Indonesia Alamsyah Kurniawan; Andi Egon; Karina Aprilia Sujatmiko; Ardi Iman Malakani
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 1 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.1.83-92

The development planning of a tidally-influenced fluvial zone poses a complex interaction between river discharge and its effect on the tidal patterns, especially in the dense population and high economic activity like Palembang located in South Sumatra Indonesia. Previous studies on numerical modelling in this area have focused on the flood; however, the hydrodynamic modelling described interaction between river discharge and tidal is not described in more detail. The present study aims to better understand the zone by using a combination of numerical modelling and qualitative assessment of in situ measurement data. Hence, the water level condition in the study area is a mix of tidal and river discharge. A 2D-hydrodynamic modeling has been successfully conducted to assess their interaction in this zone properly by using the commercial software, called MIKE21 FM. This study describes setting up the computational model, boundary location, type of forcing (tidal and non-tidal), bedform roughness, turbulent viscosity and extensive calibration and validation. In situ measurement indicates that the site's water level and flow characteristic is complex, a mixture of tidal force from the downstream and river flows from the upstream in which seasons play an important role. It is found that comparing model outputs and the measurement data in the study area for the validation and verification process effectively describes the hydrodynamic condition in the fluvial-estuarine transition area of Palembang. As the model shows good reliability, the long term hydrodynamic in line with transport model should be developed to support the Palembang area rapid development.

Application of Offshore HDPE Pipes Route Design in North Maluku Indonesia Franto Novico; Indra Kurniawan; Andi Egon; Davide Merli
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 26, No 1 (2021): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.26.1.45-56

The lack of fresh water for the inhabitants of Maitara island is a very urgent problem to be solved. Two main factors at least must be taken into account to deliberate the right of way of subsea High-density polyethylene (HDPE) pipes, namely the hydrodynamic conditions and of a block analysis. This paper presents the study to justify the best route of subsea HDPE pipes based on hydrodynamic model analysis and concrete block strategy. The method used to analyze the best route includes 2 aspects. Firstly, the investigation method consisting of a bathymetric survey conducted by a single beam echosounder, 15 days tidal observations and seabed sediment sampling. Secondly, the hydrodynamic modelling analysis using Mike 21 FMHD and concrete block analysis, all these studies have been completed in August 2018. In the morphological behaviour analysis, three alternative routes are considered for the subsea HDPE pipes from Tidore Island to Maitara Island. The outcome of the analysis shows that the second track line option has the smallest impact by the hydrodynamic conditions, with a current speed of less than 0,5m/sec and a significant wave height of fewer than 1.2 meters. Furthermore, the uniformity of the lithology along the route is the other reason to select the second route. Finally, the concrete block analysis generated a minimum dimension of 75cm x 60cm x 30cm, and a free span of 3 meters is safe to absorb the uplift and drag forces acting on the pipe.

Perbandingan Beberapa Formula Perhitungan Gerusan di Sekitar Pilar (Kajian Laboratorium) Agung Wiyono Hadi Soeharno; Indratmo Soekarno; Andi Egon
Jurnal Teknik Sipil Vol 13 No 1 (2006)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2006.13.1.1

Abstrak. Sungai adalah salah satu sumberdaya air yang penting bagi kehidupan. Alur sungai ada yang lurus dan ada pula yang berkelok-kelok. Sarana transportasi jalan yang melintasi sungai memerlukan jembatan. Pada jembatan dengan bentang yang relatif lebar, umumnya memerlukan struktur pilar untuk menopangnya. Pilar yang ditanam pada dasar sungai memerlukan kriteria disain sedemikian sehingga bila dasar saluran disekitar pilar jembatan tersebut tergerus, maka gerusan tersebut tidak mencapai kedalaman yang membahayakan kestabilan pilar. Dalam penelitian ini, model pilar dibangun pada model sungai di Laboratorium Uji Model Fisik Hidraulik, Fakultas Tehnik Sipil dan Lingkungan ITB. Kedalaman gerusan lokal yang terjadi pada model diamati untuk berbagai aliran debit yang berbeda. Hasil pengamatan yang didapat dibandingkan dengan hasil hitungan dari beberapa formula. Formula Colorado State University (CSU) adalah formula yang paling mendekati hasil pengamatan.Abstract. River is water resources, which is important for humankind. The morphology of the river might to be straight or to be meander. A highway that cross a river needs a bridge. In the wide river, the bridge needs pillars to support it. Pillars that construct in the river need to have design criteria so that erosion that might be happened would not cause the pillars to be unstable. In this research, models of pillars in the river model were constructed in the Hydraulic Laboratory, Civil Engineering Departement ITB. Local Scours of the pillars were examined in the various discharges.The results were compared with several methods. The method of Colorado State University (CSU) is recomended in calculating the depth of the local scour in the reseach model condition.

Model Hidrodinamika Pasang Surut di Perairan Kepulauan Bangka Belitung Ivonne M. Radjawane; Bagus S.C. Saputro; Andi Egon
Jurnal Teknik Sipil Vol 25 No 2 (2018)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2018.25.2.5

AbstrakDinamika pasang surut di perairan Kepulauan Bangka Belitung dipengaruhi oleh pasang surut (pasut) dari Laut Cina Selatan dari sebelah utara dan Laut Jawa di sebelah selatan, selain itu terdapat juga pengaruh proses lokal akibat perairan dangkal dan selat sempit. Untuk mengetahui pola dan dinamika pasut yang di perairan Bangka Belitung, dilakukan simulasi model numerik delapan komponen pasut (M2, S2, K1, O1, N2, P1, K2, dan Q1) selama 14 hari (4 - 17 Januari 2009). Simulasi menggunakan model DHI MIKE21 Flow FM, yaitu model hidrodinamika dua dimensi horisontal dengan skema mesh fleksibel. Syarat batas model diperoleh dari Oregon State University Tidal Inversion Software (OTIS) yang dikenal sebagai program Tidal Model Driver (TMD. Hasil dari simulasi model divalidasi terhadap data lapangan pada enam stasiun Babel Ocean Observation and Technologies (BOOST) Center. Hasil simulasi model menunjukkan bahwa pola pasang surut di perairan Kepulauan Bangka Belitung didominasi oleh tipe harian tunggal (diurnal) dengan komponen pasang surut K1 yang terbesar kemudian diikuti oleh komponen O1. Hasil simulasi model juga menunjukkan bahwa dinamika pasang surut pada perairan Bangka Belitung dipengaruhi oleh dinamika Laut Cina Selatan yang memiliki pola pasang surut harian tunggal (diurnal), dimana komponen terbesar K1 terdispersi dari Laut Cina Selatan menuju Selat Karimata dan perairan Bangka Belitung.AbstractTidal dynamics in Bangka Belitung Archipelago waters is influenced by the tidal from South China Sea from the north, the Java Sea from the south, and local processes due to shallow water and narrow strait. To understand the tidal dynamics in Bangka Belitung waters, a numerical model has been simulated with 8 major tidal constituents (M2, S2, K1, O1, N2, P1, K2, and Q1) for a period of 14 days (4 to 17 January 2009). The simulation was carried out using DHI's MIKE 21 Flow FM software, a 2-dimension flexible mesh hydrodynamic model. The model boundary conditions were obtained from the Oregon State University Tidal Inversion Software (OTIS), also known as the Tidal Model Driver (TMD). The model has been validated against measurement in six stations of BOOST Center (Babel Ocean Observation and Technologies). The simulation results show that the tidal dynamic in Bangka Belitung waters is dominated by diurnal tidal constituent, with K1 is the largest tidal constituent then followed by O1. The result also indicates that the tidal dynamic in Bangka Belitung waters is dominated influenced by the diurnal constituents K1 coming from the South China Sea dispersed towards the Karimata Strait and Bangka Belitung water.

MORFODINAMIKA JANGKA PENDEK PENDANGKALAN DI ALUR PELAYARAN BARITO, KALIMANTAN SELATAN Franto Novico; Arif Ali; Eko Saputro; Adi Sinaga; Andi Egon
JURNAL GEOLOGI KELAUTAN Vol 15, No 2 (2017)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Potensi sumber daya mineral di pulau Kalimantan pada umumnya berada di hulu-hulu sungai yang relatif jauh dari pantai. Potensi ini pada umumnya telah dieksplorasi bahkan dieksploitasi, namun kendala yang umum dihadapi adalah pengangkutan hasil tambang tersebut. Keterbatasan sarana dan prasaran transportasi darat akibat kondisi alam yang berawa sehingga menyebabkan pilihan jatuh kepada transportasi sungai yang lebih murah efektif dan efisien. Kendala yang umum terjadi pada system transportasi melalui sungai adalah pendangkalan di alur masuk dan muara sungai, oleh karena itu diperlukan pengerukan untuk pendalaman alur pelayaran. Penelitian ini bertujuan untuk mempelajari perubahan morfologi akibat sedimen yang menyebabkan pendangkalan dan penyempitan pada muara Sungai Barito. Pendekatan yang digunakan untuk analisis perubahan morfodinamika dilakukan dengan bantuan simulasi model numerik dengan menggunakan software Delft3D. Berdasarkan simulasi model morfodinamika Delft 3D, maka dapat diketahui sedimentasi tertinggi terjadi pada areal lokasi sekitar muara Sungai Barito, dimana terjadi pendangkalan sampai sebesar 1,2 meter per-tahun. Sedangkan pada bagian selatan alur pelayaran terjadi penyempitan sebesar 300-400 meter per tahun. Hal ini menunjukkan bahwa kondisi morfologi sangat dipengaruhi oleh debit Sungai Barito. Kata kunci: Morfodinamika, Dasar Laut, Alur Pelayaran, Sungai Barito, Kalimantan Selatan, Delft3D, Pemodelan erosi dan sedimentasi The potency of mineral reserves in Kalimantan Island has mostly located at the upstream area that is quiet far from the coastline. Generally, the mineral potency have been explored and sometime exploited, however the most common problem in this system is how to transport of those reserves. The limitation of onland facilities and infrastructures due to swampy area caused the river transportation is the cheapest, affective and efficient choosen alternative. However, the most common constraints on river transportation systems are silting in the inlet and estuarine. Therefore the dredging is obviously important for deepening of the access channel. The aim of this study is to reveal morphological changes due to sediment transport that is causing silting and narrowing the area around the Barito estuarine. The numerical model using Delft3D is conducted to analyse the morphodynamic changing.Based on the Delft3D model simulation results, the highest sediment deposition occurs at a location near the Barito river estuary, where the sedimentation rate is up to 1.2 meter per year. In the southern part of the navigation canal, the canal width is reduced up to 300-400 meter per year. These indicate that the morphological process at this location highly influenced by the river discharge. Keywords: Morphodynamic, Seabed, Access Channel, Barito River,Delft3d, Erosion and Sedimentation Model

Tidal Current Energy Resources Assessment in the Patinti Strait, Indonesia Franto Novico; Evi Hadrijantie Sudjono; Andi Egon; David Menier; Manoj Methew; Munawir Bintang Pratama
International Journal of Renewable Energy Development Vol 10, No 3 (2021): August 2021
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2021.35003

Indonesia is currently intensively developing its renewable energy resource and targets at least 23% by 2025. As an archipelago country, Indonesia has the potential to benefit from its abundant renewable energy resources from its offshore regions. However, the short tidal range of mixed semi-diurnal and the suitable tidal turbine capacity may hinder marine renewable energy development in Indonesian waters. This paper presents higher-order hydrodynamic numerical models to provide spatial information for tidal current resource assessment of the Patinti Strait. The present study applied the hydrographic and oceanographic method to produce input of the numerical model. Based on the selected simulation analysis, the highest current speed could be identified around Sabatang and Saleh Kecil Island with up to 2.5 m/s in P1 and 1.7 m/s in P4. Besides, the operational hours for the two observation points are 69% and 74.5%, respectively. The results indicate that this location is of prime interest for tidal turbine implementation as an energy source, for medium capacity (300 kW) and high capacity (1 MW).

HYDRODYNAMICS AND SEDIMENT CHARACTERISTICS ON A BATHYMETRICALLY-CONTROLLED RIP CHANNEL IN PANGANDARAN BEACH Hanif Santyabudhi Sutiyoso; Andi Egon
Bulletin of Geology Vol 3 No 3 (2019): 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.2019.3.3.5

Rip currents are hydrodynamic events that form vary alongshore depend on local setting of its bathymetry feature and forcing. When it occurs, it is important to understand the process in order to prepare safety issues on recreational beaches. Bathymerically-controlled rips are the focus in this study, as this type is commonly found on Indonesia’s coastal areas, particularly in south coast of West Java. This unique hydrodynamics feature affects sediment characteristic, particularly at the rip channel as the lower part (far from shore) tends to have coarser sediment due to larger friction. Such complex interactions need thorough investigation; therefore, a study was conducted in Pangandaran which well-known for its rip currents. Field observation was made to collect sediment sample on cross shore direction which shows finer sediment on upper rip channel and coarser sediment on the lower part with diameter size of 0.35 mm and 0.37 mm, respectively. In addition, simple simulations were also made to illustrate rip current movement on a channel. The result shows that in the strongest current area with over than 3.0 m/s current speed, i.e. on the lower part of rip channel, bed shear stress is found to be the strongest. It is been noticed as well that the bed shear stress forms a pattern which delineate overall movement of a rip current. Furthermore, the variation of bed shear stress is revealed as the main cause of sediment distribution along the cross-shore direction. Therefore, this simple approach qualitatively illustrates the dynamics of rip current phenomenon.

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