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Pengembangan Pentapod Armor Beton Jenis Baru untuk Pelindung Bangunan Pantai Natakusumah, Dantje Kardana; Achiari, Hendra; Nugroho, Eka; Hidayatulloh, Syarif; Angelo, Jonathan; Adinata, Fitra
Jurnal Teknik Sumber Daya Air Vol. 3 No. 2 (Desember 2023)
Publisher : Himpunan Ahli Teknik Hidraulik Indonesia (HATHI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56860/jtsda.v3i2.92

Abstract

This paper discusses PentaPod concrete armor, a new type of coastal structure protection made from concrete designed to shield against wave and tidal damage. PentaPod concrete armor can be arranged randomly or in an organized fashion without requiring ties. However, it can also be installed systematically, in one or multiple layers, interconnected with ties. The overall stability of structures with PentaPod armor far exceeds that of conventional concrete armor installations. The research method involves determining the Stability Coefficient (Kd) for two variants of PentaPod concrete armor, namely PentaCone and PentaOcta, tested in a Wave Tank. This study aimed to find the stability coefficient for both variants of PentaPod concrete armor when installed randomly and systematically without tie bonds. The novelty of the research includes that the concrete armor: 1) can be installed randomly and systematically, 2) systematic installation without ties reduces the number of armor units and associated costs, 4) systematic tie-bonded installation improves stability and can reduce the size of armor units, thus lowering costs, 5) the use of ties facilitates the installation of armor on the surface and underwater. In this paper, the Flow 3D software is used as a Numerical Wave Flume. Although there are no results from the Numerical Wave Flume that can be compared with the results from the Physical Wave Flume, this is an initial step toward obtaining complementary results between the Physical and Numerical Wave Flume methods.
Analisis Pengaruh Pasang Surut terhadap Pengendalian Banjir ti Sungai Lamong Ruas Desa Jono Humaidi, Humaidi; Hazmi, Miftah; Rizqy, Muhammad Arief; Natakusumah, Dantje Kardana
Indonesian Research Journal on Education Vol. 4 No. 4 (2024): irje 2024
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/irje.v4i4.1488

Abstract

Daerah hilir Sungai Lamong sebagian besar merupakan dataran rendah dan datar, dengan lebih dari 60% kemiringan lereng hilir kurang dari 8%. Pada penelitian ini, geometri memanjang Sungai Lamong dari Desa Jono menuju bagian hilir di Muara Sungai Lamong + 12 Km. Memahami penyebab banjir ini memerlukan analisa fluktuasi pasang surut air laut karena Sungai Lamong Hilir bermuara langsung menuju Selat madura. Tujuan utama dari penelitian ini adalah untuk mengevaluasi dampak pasang surut air laut terhadap Sungai Lamong. Metodologinya melibatkan pengumpulan data primer dan sekunder, yang berfungsi sebagai masukan untuk pemodelan hidraulika pengaruh pasang surut menggunakan aplikasi HEC-RAS. Dengan menggunakan metode L-Square, analisis data pasang surut menunjukkan HWL 1.39 meter, MSL 0.00 meter, dan LWL 1.38 meter. Setelah itu, analisis hidrologi dengan memanfaatkan data curah hujan dan debit menghasilkan debit rencana Q2 sebesar 402.4301 m3/s dan Q10 sebesar 545.9304 m3/s. Pemodelan dilakukan dengan 6 skenario: debit Q2 dan Q10 pada saat HWL, MSL dan LWL. Hasil pemodelan menunjukkan tidak adanya pengaruh pasang surut pada debit banjir Q2 dan Q10. Sehingga debit Q2 dan Q10 mengalir menuju Selat Madura.
Penilaian Risiko (Risk Assesstment) Kavitasi pada Pelimpah Ogee dan Pelimpah Bulat menggunakan Computational Fluid Dynamics (CFD) Annas, Syaeful Annas; Natakusumah, Dantje Kardana; Rizki, Annisa; Djambek, Nanda Putri
Indonesian Research Journal on Education Vol. 5 No. 2 (2025): Irje 2025
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/irje.v5i2.2205

Abstract

Kavitasi merupakan peristiwa pengikisan permukaan benda dalam hal ini permukaan struktur pelimpah yang terjadi karena perubahan kecepatan mendadak pada saat fluida melewati suatu geometri tertentu. Pelimpah Ogee dan Pelimpah Bulat memiliki bentuk geometri yang berbeda sehingga risiko kavitasi yang terjadi juga pasti berbeda. Data geometri pelimpah yang diambil dalam penelitian ini sebanyak 2 (dua) buah model untuk masing-masing Pelimpah Ogee dan Pelimpah Bulat yaitu rasio P/Hd=3 (tinggi muka air desain 3 m dengan tinggi pelimpah 6 m) hulu vertikal dan hulu miring 1:3. Analisis tekanan dan kecepatan aliran dilakukan dengan Computatonal Fluid Dynamics (CFD) untuk memodelkan perilaku aliran pada suatu geometri struktur dengan metode numerik dalam penelitian ini menggunakan software flow 3D Penilaian risiko kavitasi dengan menghitung Indeks Kavitasi yang terjadi dengan parameter tekanan dan kecepatan aliran yang terjadi pada geometri pelimpah.  Hasil analisis risiko kavitasi menunjukkan pada bagian mercu, pelimpah ogee memiliki risiko lebih rendah dibandingkan dengan pelimpah bulat, sedangkan pada bagian downstream, pelimpah ogee dan pelimpah mempunyai potensi kavitasi yang sama. Secara keseluruhan berdasarkan indeks kavitasi, pada pelimpah P/Hd=3 pelimpah ogee dan pelimpah bulat dengan rasio P/Hd=3 memiliki tingkat risiko yang rendah (aman terhadap kavitasi) sehingga tidak memerlukan penanganan lebih lanjut.
Pengembangan PentaPod, Armor Beton Jenis Baru Untuk Pelindung Bangunan Pantai Natakusumah, Dantje Kardana; Achiari, Hendra; Oktariyanto Nugroho, Eka; Adinata, Fitra; Hidayatulloh, Syarif; Angelo Ishakputra, Jonathan; Aryo Bronto, Danis; Syabhan, Kiromi
Jurnal Teknik Sipil Vol 31 No 1 (2024): Jurnal Teknik Sipil - Edisi April
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.1.4

Abstract

Abstrak Check dam, yang dikenal sebagai bendungan kecil atau bendung pengendali sedimen, adalah struktur yang dibangun melintang aliran air, seperti sungai atau saluran drainase, dengan tujuan utama untuk mengendalikan aliran air dan mengurangi kecepatannya. Umumnya dibuat dari pasangan batu atau beton, namun penelitian ini menggunakan checkdam yang terbuat dari pentapod. Check Dam PentaPod yang terbuat dari PentaPod menawarkan solusi armor beton inovatif dengan fitur interkonektivitas, dirancang khusus untuk mengurangi kecepatan air dan secara efektif mencegah erosi dan degradasi dasar sungai. Dengan bentuk lintas seksional yang kompak, struktur ini ditempatkan secara strategis di sungai guna memperlambat aliran air dan meningkatkan stabilitas struktural terhadap gaya dinamis arus sungai. Uji model hidraulik Check Dam PentaPod yang dilakukan oleh Laboratorium Sungai dan Sedimentasi ITB bertujuan mensimulasikan berbagai kondisi hidrodinamik untuk mengevaluasi efektivitas dan kinerja struktur dalam menjaga integritas dan stabilitas di bawah beragam kondisi aliran dan tinggi air. Langkah ini penting untuk memastikan kemampuan Check Dam PentaPod dalam mengontrol degradasi dasar sungai dan menjaga stabilitas tepi sungai secara efektif. Kata-kata Kunci: PentaPod, armor beton baru, check dam, perlindungan alur sungai. Abstract Check dams, also known as small dams or sediment control dams, are structures built across waterways like rivers or drainage channels. Their primary purpose is to regulate water flow and reduce its velocity. Traditionally constructed from stone or concrete, this research explores check dams made from a novel material: PentaPods. The PentaPod Check Dam utilizes prefabricated PentaPod concrete units with interlocking features. This innovative armor solution is specifically designed to decrease water velocity and effectively prevent erosion and riverbed degradation. Due to its compact cross-sectional form, the structure can be strategically placed in rivers to slow down water flow and enhance its structural stability against the dynamic forces of river currents.Hydraulic model testing of the PentaPod Check Dam, conducted by the ITB River and Sedimentation Laboratory, aims to simulate various hydrodynamic conditions. This evaluation process assesses the structure's effectiveness and performance in maintaining integrity and stability under diverse flow rates and water levels. These tests are crucial for ensuring the PentaPod Check Dam's ability to effectively control riverbed degradation and safeguard the stability of riverbanks.  Keywords: PentaPod, new concrete armor, check dam, river channel protection.
Analysis of The Effectiveness of Sediment Control Structures and River Improvement on The Omu River Post-Earthquake in Sigi Regency Putranto, Angga Eko; Adityawan, Mohammad Bagus; Moerwanto, Arie Setiadi; Natakusumah, Dantje Kardana
JURNAL TEKNIK HIDRAULIK Vol 15, No 1 (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.v15i1.749

Abstract

This study aims to analyze the effectiveness of sediment control structures, such as sabo and consolidation dams, and river normalization on sediment control in the Omu River after the earthquake in Sigi Regency on September 28, 2018. The analysis was conducted using the Universal Soil Loss Equation (USLE) method based on average rainfall data over 20 years. Erosion and sedimentation volumes before and after the earthquake were analyzed to understand the changes. The results showed that in 2020, the erosion volume reached 120,700.27 m³/year, and sedimentation was 17,030.81 m³/year, an increase from 2017, which recorded an erosion volume of 91,282.60 m³/year and sedimentation of 12,879.97 m³/year. Sediment transport simulation with daily discharge over 12 years indicated that in Scenario-1, sediment could be reduced by 10.81%, and in Scenario-3 by 23.18%. Meanwhile, simulation with Q100 flood discharge in Scenario-2 showed sediment reduction by 47.18%, and in Scenario-4 by 62.96%. The general conclusion of this study is that sediment control structures and river normalization are effective in reducing sediment volumes. Specifically, the construction of sediment control structures has proven to significantly reduce erosion and sedimentation. This research highlights the importance of structural improvements in mitigating post-disaster erosion impacts. The results of this study can serve as a reference for planning and implementing sediment control in disaster-prone areas. Keywords: sediment control, sabo dam, consolidation dam, river normalization, Omu river
KOMBINASI PREDIKSI VOLUME SEDIMEN MENGGUNAKAN METODE HECRAS-USLE UNTUK MENDUKUNG KONSERVASI DAS LAMBIDARO PALEMBANG, SUMATERA SELATAN Sultan, Masri nur; Farid, Mohammad; Prasetyo, Adi; Kusuma, Muhammad Syahril Badri; Natakusumah, Dantje Kardana
JURNAL SUMBER DAYA AIR Vol 19, No 2 (2023)
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/jsda.v19i2.851

Abstract

 Over the past ten years, flooding has been the most frequent problem in South Sumatra Province, Indonesia. As the capital of South Sumatra Province, Palembang City faces similar problems, where Lambidaro Watershed is the watershed with the highest 25-year potential flood discharge in Palembang City. One of the causes of flooding is the lack of river channel capacity related to land erosion in the watershed. This study aims to learn the prediction of sediment volume and efforts to reduce it in the Lambidaro watershed, Palembang City. This study uses two types of modeling, namely numerical models and empirical models. The numerical model uses the HEC-RAS 6.3.1 application, while the empirical model uses the USLE and SDR equations. The input parameters of the numerical model use some data derived from field measurements. The sediment concentration and observation discharge parameters were measured three times in September 2022. The grain size distribution parameters were sampled at three locations each once in August 2022, and the cohesive parameter was sampled at one location twice in August 2022. The result of the prediction of sediment volume by the numerical model is 1,421.86 m3/year. In contrast, the result of the prediction by the empirical model is 476,941.25 m3/year. Efforts to reduce the prediction of sediment volume USLE method are in the form of applying the intercropping method. The results of the conservation study show that the efforts made can reduce the volume of sediment by 17%.Keywords:       sediment, flood, conservation, intercropping, Lambidaro 
Penentuan Debit Banjir Rancangan Sungai Saluki Kabupaten Sigi dengan Metode HSS SCS Setyoasri, Yosephina Puspa; Natakusumah, Dantje Kardana
Journal of Applied Civil Engineering and Infrastructure Technology Vol 7 No 2 (2026): Desember 2026 (Articles in Press)
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/jaceit.v7i2.1111

Abstract

This study aims to determine the design flood discharge as the basis for planning the construction of a sabo dam on the Saluki River. The sabo dam is intended to protect the existing weir structure and ensure the sustainability of raw water supply in the Pasigala region (Palu, Sigi, Donggala). The 7.4-magnitude earthquake that struck on September 28, 2018, had a severe impact on infrastructure in Central Sulawesi, including water resources facilities along the Saluki River. As part of post-disaster rehabilitation and reconstruction efforts, a weir and intake structure were built to meet raw water needs. However, the Saluki River—classified as a third-order river within the Palu watershed—carries sediment and debris during flood events, posing a threat to infrastructure. Debris flow is a hazardous phenomenon involving a high-speed mixture of water, mud, gravel, and rocks that can damage downstream structures. Therefore, constructing a sabo dam upstream of the weir is essential. This preliminary study employed hydrological analysis using the Synthetic Unit Hydrograph method of the Soil Conservation Service (SCS-UH) to estimate the design flood discharge, considering the limited rainfall data in the area. The analysis resulted in flood discharges for various return periods: Q2 = 116.14 m³/s; Q5 = 158.15 m³/s; Q10 = 185.97 m³/s; Q25 = 221.12 m³/s; Q50 = 247.19 m³/s; and Q100 = 273.08 m³/s. These values serve as a reference for designing the sabo dam, analyzing sediment transport and storage capacity, and developing flood mitigation strategies for the Saluki River sub-watershed.
Pelimpah ITB Golden Ratio: Inovasi Geometri Mercu Pelimpah untuk Kemudahan Perencanaan dan Kinerja Hidraulis yang Baik Natakusumah, Dantje Kardana; Annas, Syaeful; Nugroho, Joko; Nugroho, Eka Oktariyanto; Kuntoro, Arno Adi; Adinata, Fitra
Jurnal Teknik Sipil Vol 32 No 3 (2025): Jurnal Teknik Sipil - Edisi Desember
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2025.32.3.2

Abstract

Abstract A spillway is a critical hydraulic structure used to release excess water when the water surface elevation in a dam exceeds the normal limit. The discharge capacity is strongly influenced by its geometric profile. In Indonesia, ogee and circular spillways are the most commonly used types. The ogee spillway is known for its superior hydraulic performance but features a complex geometry that requires high construction precision. In contrast, the circular spillway offers a simpler design, yet lacks a standardized reference for crest curvature ratios. To address this issue, the Golden ratio Tipe Spillway was developed by applying the constant mathematical ratio φ ≈ 1.618 to the crest profile. The aim is to create a design that is simpler, visually harmonious, and still hydraulically efficient. Evaluation was conducted through numerical simulations using Flow 3D software, validated by physical model testing in the laboratory. Results show that while the ogee spillway remains the most optimal in terms of performance, the ITB Golden Ratio Spilway types A and B demonstrate comparable discharge capacity, safe pressure.   distribution, and low cavitation risk. These advantages make it a practical and reliable design alternative Keywords: Spillway crest, Flow-3D, physical model test, spillway design, ITB Golden ratio spilway.
Co-Authors ., Humaidi Achiari, Hendra Adi Prasetyo Adi Prasetyo Adinata, Fitra Adityawan, Mohammad Bagus Adityawan, Mohammad Bagus Agung Permana Angelo Ishakputra, Jonathan Angelo, Jonathan Annas, Syaeful Annas, Syaeful Annas Arno Adi Kuntoro Arno Adi Kuntoro, Arno Adi Arwin Sabar Aryo Bronto, Danis Choly Nuradil Choly Nuradil, Choly Djambek, Nanda Putri Dyah Widyaningrum Eka Oktariyanto Nugroho Hendra Darmawan Herdy Setiawan Indradjati Rachmatullah JOKO NUGROHO M Farid M Syahril B. Kusuma Masri nur Sultan Miftah Hazmi Moerwanto, Arie Setiadi Mohammad Farid Muhammad Syahril Badri Kusuma, Muhammad Syahril Badri Nugroho, Eka Oktariyanto Nugroho, Eka Permatasari, Rosmalinda Putranto, Angga Eko Rizki, Annisa Rizqy, Muhammad Arief Rosmalinda Permatasari Sabar, Arwin Setyoasri, Yosephina Puspa Sujantoko Sujantoko Sultan, Masri nur Syabhan, Kiromi Syarif Hidayatulloh Widyaningtias Widyaningtias, Widyaningtias