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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Research Report - Engineering Science Rekayasa Sipil Dinamisia: Jurnal Pengabdian Kepada Masyarakat JURNAL TEKNIK HIDRAULIK Journal of Infrastructure and Facility Asset Management Journal of the Civil Engineering Forum
Bobby Minola Ginting
Jurusan Teknik Sipil, Fakultas Teknik, Universitas Katolik Parahyangan
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Engineering Environmental Science Library & Information Science Mathematics Social Sciences Transportation Other

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PEMODELAN NUMERIK 2 (DUA) DIMENSI ALIRAN MELALUI PELIMPAH (SPILLWAY) DAN PEREDAM ENERGI (STILLING BASIN) DENGAN METODE VOLUME HINGGA Bobby Minola Ginting; Bambang Adi Riyanto
Research Report - Engineering Science Vol. 2 (2014)
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (691.498 KB)

Abstract

Dalam penelitian ini, metode volume hingga bertipe sel terpusat (cell-center) dengan metode Runge Kutta orde 4 sebagai integrasi waktu digunakan untuk memodelkan aliran melalui spillway dan peredam energi (stilling basin). Skema numerik yang diterapkan pada kasus ini dikembangkan pertama sekali oleh Jameson (1981) untuk menyelesaikan persamaan Euler yaitu aliran viskos dan non viskos, aliran laminar viskos serta aliran turbulen pada berbagai bentuk sayap pesawat. Dalam paper ini skema tersebut dimodifikasi menjadi persamaan aliran dangkal untuk menyelesaikan persamaan aliran melalui spillway dan peredam energinya. Untuk meredam osilasi, artificial viscosity sebagai operator disipasi numerik buatan digunakan. Tujuan dari penelitian ini adalah untuk menerapkan dan mengembangkan suatu model yang berbasiskan metode volume hingga untuk kasus mekanisme perambatan aliran. Model tersebut dibuat dalam bentuk source code yang ditulis dengan bahasa pemrograman Fortran 90. Model tersebut telah diaplikasikan untuk beberapa kasus hidrodinamika aliran yang diperoleh dari berbagai hasil jurnal yang telah dipublikasikan. Berdasarkan hasil verifikasi yang telah diperoleh, dapat disimpulkan bahwa model ini memberikan hasil yang baik. di mana suku disipasi numerik buatan yang dirancang mampu meredam osilasi yang muncul dengan baik.        
Numerical Simulation for One-Dimensional (1D) Wave Propagation by Solving the Shallow Water Equations using the Preissmann Implicit Scheme Prilla Lidyana; Bobby Minola Ginting; Doddi Yudianto
Journal of the Civil Engineering Forum Vol. 8 No. 2 (May 2022)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (524.503 KB) | DOI: 10.22146/jcef.3872

Abstract

This research simulated one-dimensional wave propagation by solving the shallow water equations using the Preissman implicit numerical scheme due to its ability to maintain simplicity and stability at a larger time step value. This numerical model was fundamentally developed to satisfy the shallow water condition, where the water depth or horizontal-length scale is much smaller than the free-surface disturbance wavelength or vertical-length scale, and to comprehensively test the accuracy of the model. Consequently, three different types of waves were considered and these include (1) tidal, (2) roll, and (3) solitary. In the first case, the model was proven to be robust and accurate due to its relatively-small errors for both water-surface elevation and velocity indicating that the Preismann scheme is suitable for longwave simulations. In the second case, it was fairly accurate in capturing the periodic permanent roll waves despite showing a higher water-surface elevation than the one observed and this discrepancy is due to the neglect of the turbulent Reynold stress in the model. Meanwhile, the last case showed remarkable discrepancies in the water-surface elevation because the dispersion effect is quite significant during the wave propagation. This indicates that the Preismann scheme underestimated the wave crest along with time when the dispersion term was neglected. All simulations were performed using the tridiagonal matrix algorithm, thereby eliminating the need for iterations for the solution of the Preismann scheme. The findings of this study are beneficial to the next generation of the Preissmann-scheme models which can be designed to include turbulence and dispersion terms.
Perbandingan Debit Limpasan Langsung antara Pendekatan Model Numerik dan Konvolusi Hidrograf Satuan Sintetis Cleon Christopher; Bobby Minola Ginting; Doddi Yudianto; Albert Wicaksono
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 28, Nomor 1, JULI 2022
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1027.341 KB) | DOI: 10.14710/mkts.v28i1.42309

Abstract

This paper compares the results of direct runoff obtained by a numerical model of the shallow water equations (SWE) with the synthetic unit hydrograph (SUH) methods generally used in Indonesia. It is known that such SUH methods are still empirical, thus making it difficult for users to determine a representative method. Meanwhile, the hydrodynamic approach such as the SWE numerical model can achieve more accurate results in predicting the direct runoff compared to the SUH methods, because the model itself is derived mathematically based on the physical processes. The findings indicate that the direct runoff predicted using the SWE numerical model (HEC-RAS 5.0.7) produced more accurate results for the peak discharge with an average error of -0.07%, the peak time with an average error of 19.77%, and the shape of the hydrograph with the smallest Root Mean Square Error (RMSE) from all the cases tested. Therefore, it can be concluded that in the future the use of a hydrodynamic approach is highly recommended for the direct runoff prediction. This paper was also aimed to be used as a reference in the development of new, more accurate SUH method in the future.
A New Approach to Estimate the Potential Assets Loss due to Dam-Break Event in Indonesia Farrell Wiguna; Doddi Yudianto; Bobby Minola Ginting; Albert Wicaksono
Journal of Infrastructure & Facility Asset Management Vol 4, No 1 (2022): Journal of Infrastructure & Facility Asset Management
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/jifam.v4i1.14287

Abstract

A dam break is a devastating natural catastrophe that can lead to huge losses. In general, the severity of a disaster can be determined by the amount of damage it causes. The greater the loss, the more severe the disaster and vice versa. However, determining the potential asset loss as a result of a disaster is a challenging task. So far, there is no method for calculating potential asset loss that is specifically made for dam-break disasters. Therefore, this study proposes a new approach in calculating the potential asset loss for a dam-break. In this study, the potential asset loss is calculated by considering four factors, namely the Potential Loss of Lives (PLOL), Potential Loss of Incomes (PLOI), Potential Loss of Houses Damage (PLOHD), and Potential Loss of Productive Land (PLOPL). In addition, the study calculates the potential asset loss of the Ketro Dam dam-break disaster. Based on the evaluation results, the PLOL might reach Rp. 26,419,715,661.  PLOI might reach maximum value of  Rp. 1,185,600,000. PLOHD might reach maximum value of Rp. 4,255,325,000. And  lastly , PLOPL might reach maximum value of  Rp. 25,375,080,780. Thus, the potential asset loss for the Ketro Dam dam-break disaster based on the analysis can reach Rp. 57,235,721,441 or USD 4,026,304.
Establishing a Simple-yet-effective Approach of Early Warning System for Storm-Induced Earth-Filled Dam-Break Cases in Data-sparse Region Doddi Yudianto; Farrell Wiguna; Bobby Minola Ginting; Albert Wicaksono; Xie Yuebo
Journal of the Civil Engineering Forum Vol. 9 No. 2 (May 2023)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.6126

Abstract

Historically, the occurrence of dam-break cases has been proven to cause significant loss of life and economical damage. Apart from the catastrophic nature of dam-breaks, the absence of a robust disaster prevention system exacerbates the disasters that occur. This study proposes an Early Warning System (EWS) to mitigate the impact of dam-break disasters. However, predicting the occurrence of such disasters is challenging, specifically in areas like Indonesia, where comprehensive data recording is lacking. While it may be difficult to predict the occurrence of a sunny day break, the storm-induced break is more predictable. Therefore, this study proposes a simple yet effective macro-based EWS for Earth-Filled Dam-Break Cases using a macro approach based on the Evacuation Clearance Time (ECT). By comparing the ECT value with the arrival time of the floods from the affected areas, additional evacuation time can be obtained, which will be used to determine the EWS. The proposed EWS for Cengklik Dam is given in three levels of warning indicated by the reservoir water level at +141.36 m, +141.40 m, and +141.45 m. With the proposed EWS, the results show that 100% of people are expected to reach the evacuation point safely. The case study shows that the proposed EWS can significantly reduce the risk impact of the dam-break events.
Investigating the Capability of HEC-RAS Model for Tsunami Simulation Rifa Amaliah; Bobby Minola Ginting
Journal of the Civil Engineering Forum Vol. 9 No. 2 (May 2023)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.6140

Abstract

This study highlights the simulation of tsunami cases using HEC-RAS 6.1. The primary aim is to evaluate the capability of the software in performing tsunami simulation due to its standalone computational framework (pre-processing, execution, and post-processing stages), making the modeling process interactive. The model accuracy was tested against some benchmark cases of wave propagation, including analytical solutions, laboratory experiments, and field measurements. The results showed HEC-RAS was capable of modeling tsunami propagation. The maximum elevation and velocity magnitude were accurately computed for the analytical cases. Furthermore, sufficiently accurate results were obtained for the laboratory case, where the maximum elevation was properly computed. For the field cases, the wave arrival time and the fluctuations of water surface and velocity were appropriately calculated. The Root Mean Square Error values between the numerical results and the analytical/observed data were relatively low below 30%, with the Pearson Product Moment Correlation values ranging from 52–99%. In addition to its eminence, a drawback was found regarding the graphical user interface (GUI) of HEC-RAS for the input of boundary conditions. These findings will be beneficial for the coastal engineering community and the continuous development of HEC-RAS.
DESAIN TANGGUL SEBAGAI SOLUSI BANJIR DENGAN MODEL HIDRODINAMIK NUFSAW2D PADA DESA MAEN, SULAWESI UTARA Bobby Minola Ginting
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.v14i1.722

Abstract

ABSTRACT The Maen Village, Minahasa Utara Regency, Province of North Sulawesi, is located adjacent to the sea and on the confluence of three rivers namely Maen Besar River, Maen Kecil (Atas) River, and Maen Kecil (Samping) River. Hence, the village area is prone to flooding, especially when heavy rainfall and high tide water occur. Therefore, this research was conducted to study levee design as the flood solution for such a village. In this work, the flood simulation was conducted using a hydrodynamic model NUFSAW2D to predict the inundation pattern for the existing condition. It was shown that the existing levee constructed for the Maen Besar River could anticipate the 2-year return period flood. However, the capacity of the Maen Kecil River was insufficient for the 2-year flood, and consequently, it caused flooding in the Maen Village. For the 25-year return period flood, all the rivers had insufficient capacity. To deal with this problem, levee design was proposed, for which the crest level of the existing levee of the Main Besar River must be increased and the new levee toward its upstream part must be constructed. Meanwhile, along the Maen Kecil River, new levee must be constructed. The simulation results using NUFSAW2D showed that with such a levee system, the Maen Village became safe from the 25-year flood. Additionally, it was required to add two retention ponds to collect the overland flow water from the Main Village, and later to flow it back to the Maen Besar and Maen Kecil Rivers. The result of this study is expected to be useful for the related stakeholders to solve the flood problem for the Main Village.   Keywords:       flood, Maen Village, NUFSAW2D, levee ABSTRAKDesa Maen, Kabupaten Minahasa Utara, Provinsi Sulawesi Utara, terletak berbatasan dengan laut serta berada di pertemuan antara tiga sungai yaitu Sungai Maen Besar, Sungai Maen Kecil (Atas) dan Sungai Maen Kecil (Samping). Hal ini menyebabkan kawasan tersebut rawan banjir, khususnya saat hujan deras disertai dengan kondisi air pasang. Oleh sebab itu, studi ini dilakukan dengan tujuan mengkaji desain tanggul sebagai solusi penanganan banjir untuk kawasan tersebut. Kajian dilakukan berdasarkan simulasi banjir menggunakan model hidrodinamik NUFSAW2D untuk mengetahui pola genangan banjir kondisi eksisting. Dari hasil simulasi diketahui bahwa tanggul eksisting yang telah dibangun untuk Sungai Maen Besar mampu mengatasi banjir dengan kala ulang 2 tahun. Namun, kapasitas Sungai Maen Kecil tidak mampu mengalirkan debit banjir 2 tahunan sehingga menyebabkan banjir pada kawasan Desa Maen. Untuk kala ulang 25 tahun, kapasitas ketiga sungai tidak cukup untuk mengalirkan debit banjir. Untuk mengatasi masalah ini, penerapan sistem tanggul diusulkan, dimana tanggul eksisting yang berada pada sisi Sungai Maen Besar harus ditinggikan dan selanjutnya dibutuhkan pembangunan tanggul baru ke arah hulu. Sementara, sepanjang Sungai Maen Kecil tanggul baru harus dibangun. Hasil simulasi model NUFSAW2D menunjukkan bahwa dengan adanya sistem tanggul, kawasan Desa Maen menjadi aman terhadap banjir kala ulang 25 tahun. Selain itu, diperlukan dua kolam retensi untuk menangkap air hujan dari dalam kawasan Desa Maen untuk selanjutnya dialirkan kembali ke Sungai Maen Besar dan Sungai Maen Kecil. Hasil kajian dalam studi ini dapat dimanfaatkan oleh pemangku kepentingan (stakeholder) terkait dalam mewujudkan kawasan Desa Maen yang bebas banjir.        Kata Kunci:             banjir, Desa Maen, NUFSAW2D, tanggul
Pemodelan Rain-On-Grid Untuk Kasus Banjir pada Polder Pluit, Jakarta Riksa Nugraha Utama; Bobby Minola Ginting; Segel Ginting
Rekayasa Sipil Vol. 17 No. 3 (2023): Rekayasa Sipil Vol. 17 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2023.017.03.13

Abstract

Jakarta flood occurs almost every year, one of the reasons is the rapid development of its urban areas. Generally, Jakarta is categorized as a flat area, of which some locations are lower than the mean sea level, for example Pluit Polder area, thus being prone to flood. In this study, the rain-on-grid modeling with HEC-RAS software is carried out to determine the parts of the Pluit Polder that are still inundated so that better mitigation strategies can be achieved. The modeling results show that there are still inundated areas around the Pluit Polder ranging from 0.25 m to 2.75 m.
The Evaluation of Water Loss in The Western North Tarum Irrigation Channel Tandiono, Felix; Yudianto, Doddi; Li, Ren; Ginting, Bobby Minola; Wicaksono, Albert; Fitriana, Finna; Fiona, Megan
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.v15i1.790

Abstract

The Western North Tarum Irrigation channel plays a crucial role in supplying water to irrigated agricultural areas. However, it encounters challenges in ensuring adequate water delivery to all channel segments. This research assesses water loss during the distribution process in the Western North Tarum Irrigation channel, focusing on the evaluation of channel capacity and the impact of suboptimal water management on water loss. The study employs the HEC-RAS model, a hydraulic system analysis tool, to evaluate the channel’s capacity and simulates its behavior under various discharge conditions. The evaluation reveals that two channel segments, B.TUB 13 and B.TUB 25, have exceeded their capacity limits, resulting in overflow. Sedimentation downstream, particularly in these segments, exacerbates the issue by altering the channel slope and impeding water flow. This research identifies poor water distribution management as a significant factor contributing to water loss in the irrigation channel. Inadequate scheduling and the absence of proper water measurement tools result in instances of overwatering or underwatering in some areas. The lack of monitoring and control in the irrigation system hampers the detection of uncontrolled flow in the channels, leading to substantial water loss and inefficient water use. This research underscores the importance of evaluating and maintaining irrigation channel capacity to prevent overflow and water loss. Furthermore, it emphasizes the significance of effective water management to achieve more efficient water distribution and irrigation. Addressing these challenges is crucial for ensuring the long-term sustainability of irrigated agriculture in the Western North Tarum Irrigation area.Keywords: HEC-RAS, Irrigation Channel, Water Distribution, Water Loss, Western North Tarum
Landslide Treatment in the Al-Husainiyyah Junior High School Area using Cantilever-Geofoam Wall: Penanganan Longsor di Lingkungan SMP Al-Husainiyyah dengan Menggunakan Dinding Kantilever-Geofoam Lim, Aswin; Pratama, Ignatius Tommy; Widjaja, Budijanto; Tjahjanto, Helmy Hermawan; Tjondro, Johannes Adhijoso; Wijaya, Obaja Triputera; Ginting, Bobby Minola; Setiawan, Theresita Herni; Adianto, Yohanes Lim Dwi; Hidayat, Felix; Hartieni, Patricia; William, Octavianus; Aldrianita, Tabitha; Fadhil, Imam Ahmad
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 8 No. 4 (2024): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v8i4.19519

Abstract

A landslide triggered by heavy rainfall occurred in the Al-Husainiyyah Junior High School area on April 26th, 2023. The landslide damaged the nearby access roads, the existing retaining wall, and a futsal court threatening the safety of the teachers and students in conducting the learning activities that especially require open areas. Thus, this community service aims to provide a cantilever wall design with geofoam as an innovative lightweight backfill material to reinforce the slope and repair the damaged structures. Field surveying and numerical analysis were then conducted to understand the current slope and soil conditions and to analyze the stability of the slope and retaining wall. The results show that a cantilever wall with a total height of 1.8 m supported by a strauss pile row with a diameter of 0.4 m, 4 m in length, and 2.5 m in spacing could increase the stability of the slope.
Co-Authors Albert Wicaksono Aldrianita, Tabitha Aswin Lim Bambang Adi Riyanto Budijanto Widjaja Cleon Christopher Doddi Yudianto Fadhil, Imam Ahmad Farrell Wiguna Farrell Wiguna Felix Hidayat Fiona, Megan Fitriana, Finna Hartieni, Patricia Helmy Hermawan Tjahjanto Ignatius Tommy Pratama Johannes Adhijoso Tjondro Li, Ren Prilla Lidyana Rifa Amaliah Riksa Nugraha Utama Segel Ginting Tandiono, Felix Theresita Herni Setiawan Wijaya, Obaja Triputera William, Octavianus Xie Yuebo Yohanes Lim Dwi Adianto