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All Journal Rekayasa Sipil Journal of Mathematical and Fundamental Sciences Jurnal Teknik Sipil Journal of the Civil Engineering Forum Jurnal Teknik Journal of the Civil Engineering Forum Jurnal Teknik Sumber Daya Air Makara Journal of Technology
Adityawan, Mohammad Bagus
Bandung Institute of Technology
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics

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2D Shallow Water Model for Dam Break and Column Interactions Putu Indah Dianti Putri; Rifqi Fauzan Iskandar; Mohammad Bagus Adityawan; Hadi Kardhana; Dian Indrawati
Journal of the Civil Engineering Forum Vol. 6 No. 3 (September 2020)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.167 KB) | DOI: 10.22146/jcef.54307

Abstract

Dam break causes disastrous effects on the surrounding area, especially at the downstream, therefore, there is a need for accurate and timely predictions of dam break propagation to prevent both property damage and loss of life. This study aimed to determine the movement of dam-break flow in the downstream area by solving the Shallow Water Equations (SWE) or Saint Venant Equations which are based on the conservation of mass and momentum derived from Navier Stokes equation. The model was generated using a finite difference scheme which is the most common and simplest method for dam-break modeling while Forward Time Central Space (FTCS) numerical scheme was applied to simulate two-dimensional SWE. Moreover, the accuracy of the numerical model was checked by comparing its results with the analytic results of one-dimensional cases and a relatively small value of error was found in comparison to the analytic models as indicated with the RMSE values close to 0. The numerical to the two-dimensional models were also compared to a simple dam break in a flume and dam break with column interactions and the wave propagation in both cases was observed to become very close at a certain time.  The model, however, used numerical filter (Hansen) to reduce the oscillations or numerical instability. The simulation and analysis, therefore, showed the ability of the numerical scheme of FTCS to resolve both cases of the simple dam break and dam break with column interactions in the Two-dimensional Shallow Water. 
Tsunami Early Warning System Based on Maritime Wireless Communication Aryanti Karlina Nurendyastuti; Mochamad Mardi Marta Dinata; Arumjeni Mitayani; Muhammad Rizki Purnama; Mohammad Bagus Adityawan; Mohammad Farid; Arno Adi Kuntoro; Widyaningtias
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 (1552.707 KB) | DOI: 10.22146/jcef.2878

Abstract

Tsunami buoy, linked to satellite, is commonly used as a tsunami early warning system but has been discovered to have several drawbacks such as the need for approximately 5 minutes to issue an early warning for a tsunami after detecting the initial wave as well as its fragility. It was also reported that the twenty-two buoys placed in the Indonesian seas from 2012 to 2018 were damaged and missing. Therefore, this study proposes a new method for tsunami early warning by integrating ship-to-ship maritime wireless communication. It is important to note that vessels or fishing boats with over 30 GT have the ability to travel more than 100 nmi (approximately 180 km) from the shoreline and can be equipped with point-to-multipoint VHF radio communication. Meanwhile, smaller boats on the fishing ground located approximately 2-5 km from the shore can use a WiFi network to communicate like a wireless mesh while the existing terrestrial network can be used for the ship-to-shore communication between boats and land stations. This system is expected to provide significant benefits for a fishing town such as Pangandaran, West Java, Indonesia which is directly facing Java Megathrust in the Indian Ocean. Therefore, a tsunami numerical simulation was conducted in this study using Shallow Water Equation which involved a hypothetical tsunami simulated from the possible fault source which is approximately 250 km from the source. Moreover, the vessel’s location was assumed to be in line with the fishing ground while the arrival time of the tsunami was estimated from the model to be 22.5 minutes and compared to the relay time of the proposed system which was approximately 5.4 seconds. This is faster in terms of delay than the existing system which relays information through satellite at approximately 5 minutes in an ideal condition and also has the ability to reduce the need for tsunami buoys.
Development of A 2D Numerical Model for Pollutant Transport using FTCS Scheme and Numerical Filter Maitsa, Tias Ravena; Hafiyyan, Qalbi; Adityawan, Mohammad Bagus; Magdalena, Ikha; Kuntoro, Arno Adi; Kardhana, Hadi
Makara Journal of Technology Vol. 25, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study used the finite difference method to develop a numerical model for pollutant transport phenomenon simulation. Mathematically, the phenomenon is often described by the advection–diffusion differential equation, which is obtained from a combination of the continuity equation and Fick’s first law. The Forward Time Central Space (FTCS) scheme is one of the explicit finite difference methods and is used in this study to solve the model due to its simplicity in solving a differential equation. Yet, this method is currently unstable, which results in oscillations in the model. Thus, a numerical filter (Hansen) is added to the FTCS method to improve the stability of the model. The developed numerical model is applied to several 1D and 2D pollutant transport test cases. Simulation results are compared with those of existing analytical solutions to verify the developed model, and they show that the developed model can simulate the pollutant transport phenomenon well. Moreover, the numerical filter can increase the model stability.
Artificial Neural Network dan Pemodelan Numerik untuk Prediksi Parameter Aliran akibat Dam Break Calvin Sandi; Mohammad Bagus Adityawan; Dhemi Harlan; Mohammad Farid; Novintasari Nadeak
Jurnal Teknik Sumber Daya Air Desember 2022
Publisher : Himpunan Ahli Teknik Hidraulik Indonesia (HATHI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56860/jtsda.v2i2.50

Abstract

Setiap bendungan mempunyai potensi keruntuhan bendungan, yang dapat disebabkan oleh banyak factor seperti gempa. Kejadian dam break dapat menyebabkan kerusakan besar pada bagian hilir, terutama jika hilirnya merupakan area perkotaan. Oleh karenanya, setiap pembangunan bendungan harus disertai dengan kajian terkait potensi keruntuhan bendungan untuk meminimalisir kerugian. Parameter yang didapatkan dari kajian tersebut adalah prediksi dari waktu kedatangan, kedalaman, dan kecepatan aliran banjir. Metode prediksi yang digunakan dalam studi ini adalah sebuah machine learning, yaitu Artificial Neural Network (ANN). Kasus yang digunakan pada studi ini adalah eksperimen dam break dengan satu bangunan miring pada bagian hilirnya yang kemudian dimodelkan secara numerik. Metode numerik yang digunakan adalah skema Mac-Cormack dengan filter numerik. Data yang dimasukkan pada model adalah ketinggian level air pada bendungan. Hasil yang didapat dari pemodelan numerik menunjukkan perbandingan fluktuasi muka air yang baik terhadap hasil eksperimen. Skenario yang berbeda kemudian digunakan dengan beberapa ketinggian level air pada bendungan untuk melalui proses pembelajaran, pelatihan, dan pengujian untuk menghasilkan model ANN yang paling optimum dengan nilai MSE mendekati nol sebagai parameter akurasi metode ini. Untuk mendapatkan MSE terkecil, maka digunakan algorima backpropagation perceptron karena lebih efektif dalam memprediksi parameter aliran akibat dam break. Melalui berbagai proses pengujian ANN, didapatkan performance MSE validation terbaik berada pada epoch 2 dengan nilai 0.00011882 dan dapat disimpulkan bahwa metode ANN dapat digunakan sebagai prediktor parameter aliran akibat keruntuhan bendungan. Dengan dilakukannya studi ini, diharapkan dapat membantu kajian terkait dam break pada area perkotaan di masa mendatang.
ANALISIS PRIORITAS PENANGANAN BANJIR KALI KONTO, PROVINSI JAWA TIMUR Dian Indrawati; Mohammad Bagus Adityawan; Diki Maulana Ichsan; Dhemi Harlan; Joko Nugroho
Rekayasa Sipil Vol. 16 No. 3 (2022): Rekayasa Sipil Vol.16. 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.2022.016.03.4

Abstract

Flood in Kali Konto is a disastrous hazard which strikes a lot of housing, infrastructures and paddy fields along its river banks almost every year. In 2021, along with destroyed revertment at roolagh 70 area, flood inundated more than 10 villages in Kabupaten Jombang and several more in Malang and Kediri. However, flood management at Kali Konto needs special consideration because several conditions, include watershed area pattern, extremely slope condition changing, numerous materials from Kelud mountain eruption in several part of Konto river, and a lot of infrastructures which laid in Konto river. This paper discussed about appropriate infrastructures which derived from hydrology and hydraulics modeling for Q2 and Q50 flood return periods. Since the model resulted 49 locations, Analytical Hierarchy Process (AHP) model used for determining priority for scaling down flood hazard in Kali Konto. The most priority comes to Karang Tengah, Blaru and Bugasur Kedaleman area based on the most losses occurred.
Hydrodynamics Analysis in Bedono Beach Demak Regency, Central Java Indonesia : Open Resource Processing for Modeling Rahim Mustaqim; Widyaningtias Widyaningtias; Ingerawi Sekaring Bumi; Yadi Suryadi; Eka Oktariyanto Nugroho; Hadi Kardhana; Mohammad Bagus Adityawan
Jurnal Teknik Sipil Vol 29 No 3 (2022): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2022.29.3.3

Abstract

Abstract Input data derived from open resources is used as variables in numerical model calculation. Hydrodynamic analysis at Bedono Beach is modeled using a combination of open software models Delft3D-Flow and Delft3D-Wave. The model domain uses a combination of national bathymetry from BATNAS and national topography from DEMNAS. The driving force on this model are the tides of TPXO 7.2 and the wave results of hindcasting from National Oceanic Atmospheric and Administration (NOAA) wind data. The important water level elevation of HHWL = 1,156 m, MHWL = 1.060 m, MSL = 0.600 m, MLWL = 0.140 m, LLWL = 0,044 m are obtained from observation point on grid model. In addition, the significant wave height and significant peak period for each nautical direction are calculated and being input for open boundary in wave model. The result of one month hydrodynamic visualization after simulation complete can be seen using a quickplot menu from Delft3D. Keywords: Bedono beach, open resource, Delft3D, hydrodynamic, visualization Abstrak Data masukan yang berasal dari sumber online digunakan sebagai variabel dalam perhitungan model numerik. Analisis hidrodinamika di Pantai Bedono dimodelkan menggunakan kombinasi software Delft3D-Flow dan Delft3D-Wave. Domain model menggunakan kombinasi batimetri nasional dari BATNAS dan topografi nasional dari DEMNAS. Gaya penggera pada model yaitu pasang surut TPXO 7.2 dan gelombang hasil hindcasting dari data angin National Oceanic Atmospheric and Administration (NOAA). Elevasi muka air penting HHWL = 1,156 m, MHWL = 1,060 m, MSL = 0,600 m, MLWL = 0,140 m, LLWL = 0,044 m diperoleh dari titik pengamatan pada grid model. Selain itu, tinggi gelombang signifikan dan periode puncak signifikan untuk setiap arah laut dihitung dan menjadi masukan untuk boundary dalam model gelombang. Hasil visualisasi hidrodinamika selama satu bulan setelah simulasi selesai dapat dilihat dan dianalisa menggunakan menu quickplot dari Delft3D. Kata-kata Kunci: : Pantai Bedono, open resource, Delft3D, hidrodinamika, visualisasi
Flood Modeling on the Dadap River and Estuary, Banten Province Yogi Agus Stiawan; Mohammad Bagus Adityawan; Adi Prasetyo
Jurnal Teknik Sipil Vol 30 No 1 (2023): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2023.30.1.1

Abstract

Abstract Dadap River is located in Kosambi, Tanggerang, which often experiences flooding in the estuary. The problem of flooding is caused by the lack of rivers capacity and estuaries caused by sedimentation and tidal conditions. The flooding caused damage to city infrastructure and paralyzed the activities of the affected residents. The Dadap River was normalized in 2012 to overcome the flooding problems. This study aims to determine the capacity of rivers and estuaries as an alternative solution for flood management. Simulations were carried out in conditions before and after normalization and with alternative embankment elevations. Flood modeling using the HEC-RAS 1D unsteady flow. Boundary conditions in the upstream using flood discharge with a 50 and 100 yr return period and downstream using HHWL elevation and wave height. The analysis results show that the capacity of the Dadap River before normalization was not able to accommodate flood discharge at the 50 and 100 yr return period. After normalization, the water surface elevation may decrease by 24-29%. However, there is still flooding downstream due to the tides, so raising the embankment elevation of +3.5 m. Keywords: Dadap river, estuary, flood, normalization, HEC-RAS Abtsrak Kali Dadap sering mengalami banjir di bagian muara. Kali Dadap terletak di Kecamatan Kosambi, Kabupaten Tanggerang. Permasalahan banjir di Kali Dadap disebabkan oleh berkurangnya kapasitas sungai dan muara yang disebabkan oleh sedimentasi dan pengaruh oleh kondisi pasang pasang surut. Banjir yang terjadi menyebabkan rusaknya prasarana kota serta melumpuhkan aktivitas warga yang terdampak. Kali Dadap telah dilakukan normalisasi pada tahun 2012 untuk mengatasi permalahan banjir yang terjadi. Tujuan dari studi ini yaitu untuk mengetahui kapasitas kali dan muara Dadap serta sebagai alternatif solusi penanganan banjir. Simulasi pemodelan banjir dilakukan pada kondisi sebelum dan sesudah dinormalisasi serta dengan alternatif peninggian tanggul. Pemodelan banjir dilakukan menggunakan aplikasi HEC-RAS 1D aliran unsteady. Pemodelan akan dilakukan dengan kondisi batas di bagian hulu menggunakan debit banjir dengan kala ulang 50 dan 100 tahun dan di bagian hilir menggunakan elevasi HHWL dan tinggi gelombang. Hasil analisis menunjukkan bahwa kapasitas Kali Dadap sebelum di normalisasi tidak mampu mengalirkan debit banjir kala ulang 50 dan 100 tahun. Setelah dilakukan normalisasi pada Kali Dadap, elevasi muka air dapat menurun sekitar 24 -29% tetapi masih terjadi banjir pada bagian hilir akibat pasang surut sehingga perlu adanya peninggian elevasi tanggul yaitu +3.5 m. Kata Kunci: Kali Dadap, muara Dadap, banjir, normalisasi, HEC-RAS
Effect of Jetty to the Capacity of Bogowonto River Mouth, Kulon Progo Daerah Istimewa Yogyakarta Muhammad Dandy Kusuma; Mohammad Bagus Adityawan; Ana Nurganah Chaidar
Jurnal Teknik Sipil Vol 30 No 1 (2023): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2023.30.1.3

Abstract

Abstract. Bogowonto River is the main river in the Bogowonto watershed which is included in the Serayu Bogowonto River Area. In the dry season, the mouth of the Bogowonto river closes because sediment deposits accumulate at the river mouth, disrupting the river flow to the sea. At high tide, sediment holds the Bogowonto River flow because it impacts the backwater downstream of the Bogowonto river, causing flooding in several locations, especially around Yogyakarta International Airport. The flow capacity of the Bogowonto river is decreasing, causing flooding problems, so this study needs to do an analysis. Backwater analysis at the Bogowonto River estuary simulates the existing jetty in the HEC-RAS program. In contrast, simulated morphology change river was with two jetty scenarios using the DELFT3D program. Keywords: Sediment, flooding, backwater, estuary, jetty. Abstrak. Sungai Bogowonto merupakan sungai utama di DAS Bogowonto yang termasuk dalam Wilayah Sungai Serayu Bogowonto. Pada musim kemarau muara sungai Bogowonto menutup karena endapan sedimen menumpuk di muara sungai sehingga mengganggu aliran sungai ke laut. Pada saat pasang, sedimen menahan aliran Sungai Bogowonto karena berdampak pada bagian hilir sungai Bogowonto sehingga menyebabkan banjir di beberapa lokasi terutama di sekitar Bandara Internasional Yogyakarta. Kapasitas aliran sungai Bogowonto yang semakin berkurang sehingga menimbulkan permasalahan banjir, sehingga penelitian ini perlu dilakukan suatu analisis. Analisis backwater di muara Sungai Bogowonto mensimulasikan jetty eksisting dalam program HEC-RAS. Sebaliknya, simulasi perubahan morfologi sungai dengan dua skenario jetty menggunakan program DELFT3D. Kata-kata Kunci: Sedimen, banjir, backwater, muara, jetty.
Co-Authors Adi Prasetyo Afrizal Maulana Sutrisna Arno Adi Kuntoro Arumjeni Mitayani Aryanti Karlina Nurendyastuti Asrini Chrysanti Avis Mellivera Bagus Pramono Yakti Bagus Pramono Yakti Calvin Sandi Chaidar, Ana Nurganah Dantje Kardana Natakusumah Dhemi Harlan Dian Indrawati Dian Indrawati Dian Indrawati Subagyo Diki Maulana Ichsan Eka Oktariyanto Nugroho Faizal Immaddudin Wira Rohmat Hadi Kardhana Hafiyyan, Qalbi Harkunti P. Rahayu Harkunti P. Rahayu, Harkunti P. Hendra Darmawan Idham Riyando Moe Ingerawi Sekaring Bumi Ingerawi Sekaring Bumi Iwan Kridasantausa Hadihardaja Joko Nugroho Joko Nugroho Khilmi Zain M Farid M Syahril B. Kusuma Magdalena, Ikha Maitsa, Tias Ravena Mellivera, Avis Mochamad Mardi Marta Dinata Mohammad Farid Muhammad Dandy Kusuma Muhammad Rizki Purnama Muhammad Rizki Purnama Muhammad Rizki Purnama Muhammad Syahril Badri Kusuma, Muhammad Syahril Badri Novintasari Nadeak Pratama, Maryo Inri Putu Indah Dianti Putri Rahim Mustaqim Rasmiaditya Silasari Rasmiaditya Silasari Rifqi Fauzan Iskandar Rono Hadinagoro Rono Hadinagoro Subagyo, Dian Indrawati Tia Setiawati Tia Setiawati Widyaningtias Widyaningtias Widyaningtias Widyaningtias Widyaningtias Widyaningtias, Widyaningtias Yadi Suryadi Yadi Suryadi Yakti, Bagus Pramono Yogi Agus Stiawan Zain, Khilmi