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All Journal JURNAL MATEMATIKA STATISTIKA DAN KOMPUTASI Civil Engineering Journal Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Jurnal Penelitian Enjiniring Fakultas Teknik Unhas Lowland Technology International Prosiding Seminar Nasional Teknik Sipil UMS INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Geoid - Journal of Geodesy and Geomatics
Bambang Bakri
Departemen Teknik Sipil, Fakultas Teknik, Universitas Hasanuddin
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Environmental Science Mathematics Public Health Transportation

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Pengaruh Kemiringan Struktur Plat Segitiga Terhadap Kecepatan Gesek Dasar pada Saluran Terbuka Rombebunga, Yunarto; Lopa, Rita Tahir; Bakri, Bambang
Jurnal Penelitian Enjiniring Vol 25 No 1 (2021)
Publisher : Center of Techonolgy (COT), Fakultas Teknik, Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jpe.052021.05

Abstract

Pada aliran saluran terbuka, distribusi kecepatan seringkali dibedakan sebagai distribusi kecepatan di daerah inner region, yang berada di dekat dasar dimana distribusi kecepatan logaritmik berlaku, dan di daerah outer region, yang berada jauh dari dasar dimana distribusi kecepatan menyimpang secara jelas dan sistimatik terhadap hukum logaritmik. Tujuan penelitian adalah struktur mampu meredam energi aliran dasar sehingga kecepatan yang terjadi dapat diminimalisir. Percobaan dilakukan pada saluran flume dengan Panjang 8,00 m, lebar 0,40 m dan tinggi 0,40 m. Untuk kemiringan saluran yang digunakan 0,05% dan 0,10% pada bidang licin. Tipe aliran adalah aliran seragam, menggunakan 3 (tiga) variasi debit inlet (Q). Untuk Struktur berupa model plat segitiga, menggunakan variasi stuktur dengan kemiringan 30o (M1), 45o (M2) dan 60o (M3) dengan kemiringan saluran 0.05%. Adapun tinggi plat segitiga ditentukan berdasarkan tinggi rerata kecepatan maksimum sebesar 0,6D. Hasil analisis menunjukkan bahwa kecepatan gesek yang terjadi sebelum melewati plat segitiga akan membesar dengan nilai rerata 53% (kecepatan gesek (u*) menurun) dan sesaat setelah melewati plat segitiga menjadi kecil (kecepatan gesek (u*) meningkat) dengan rerata 26% seiring bertambah besarnya kemiringan plat segitiga dan konstantan integrasi (C) berupa perubahan kecepatan aliran semakin meningkat. Namun trend kecepatan gesek yang ditunjukan untuk setiap model akan terlihat semakin menurun pada saat menjauhi plat segitiga dan hal ini mengindikasikan kecepatan gesek (u*) akan mengalami kondisi rezim aliran yang baru. Selain itu secara kuantitatif terkonfirmasi bahwa dengan adanya struktur plat segitiga maka nilai Froude yang terjadi sebelum melewati struktur akan mengalami penurunan kecepatan aliran seiring bertambah besarnya kemiringan struktur dan setelah melewati struktur, kecepatan aliran akan meningkat dan terjadi intensitas turbulen disepanjang saluran. In an open channel flow, velocity distribution is often distinguished as velocity distribution in the inner region, which is near the base where the logarithmic velocity distribution applies, and in the outer region, which is far from the base where the velocity distribution deviates clearly and systematically from the logarithmic law. The purpose of this research is the structure is able to reduce the base flow energy so that the velocity that occurs can be minimized. The experiment was carried out on a flume channel with a length of 8.00 m, a width of 0.40 m and a height of 0.40 m. The slope of the channel used are 0.05% and 0.10% on a slippery surface. The type of flow is uniform flow, using 3 (three) variations of inlet discharge (Q). For the structure in the form of a triangular plate model, using a variation of the structure with a slope of 30o (M1), 45o (M2) and 60o (M3) with a channel slope of 0.05%. The height of the triangular plate is determined based on the average height of the maximum speed of 0.6D. The results of the analysis show that the frictional speed that occurs before passing through the triangular plate will increase with an average value of 53% (friction speed (u*) decreases) and immediately after passing through the triangular plate becomes small (friction speed (u*) increases) with an average of 26% along with as the slope of the triangular plate increases, the integration constant (C) in the form of a change in flow velocity increases. However, the frictional velocity trend shown for each model will appear to be decreasing as it moves away from the triangular plate and this indicates that the frictional velocity (u*) will experience a new flow regime. In addition, it is quantitatively confirmed that with the triangular plate structure, the Froude value that occurs before passing through the structure will experience a decrease in flow velocity as the slope of the structure increases and after passing through the structure, the flow velocity will increase and turbulence intensity occurs along the channel.
Effect of Porous Rectangular Type Baffle Block Angle on Hydraulic Jump Downstream of Spillway Djunur, Lutfi Hair; Pallu, Muhammad S.; Karamma, Riswal; Bakri, Bambang
Civil Engineering Journal Vol 10, No 10 (2024): October
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-10-04

Abstract

The elevation of the water surface upstream of the spillway structure increases significantly due to damming, leading to a rapid, supercritical flow downstream. This flow transitions from supercritical to subcritical, resulting in hydraulic jumps (Lj). The placement of a porous rectangular baffle block in the chute acts as an energy dissipator within the channel. This study aimed to investigate the effect of the angle of the porous rectangular baffle block on energy dissipation and hydraulic jumps downstream of the spillway structure. The experiment utilized a two-dimensional (2D) approach to evaluate energy dissipation and hydraulic jumps under various placements of the porous rectangular baffle block in the chute. The results indicated that the water level above the weir (hd) increased, along with turbulence downstream, while energy loss decreased. However, the efficiency of energy dissipation improved as variations in the water level above the weir decreased. A baffle block with an angle (α) of 60° was found to be the most effective in dissipating flow energy and shortening hydraulic jumps. Additionally, an empirical equation was developed for the hydraulic jump length as a function of the downstream Froude number (Fr): Lj=yt (k α hd(Fr-1)^4). The porous rectangular baffle block proved advantageous as it gradually dissipates flow velocity through its pore openings, preventing flow momentum reversal. Doi: 10.28991/CEJ-2024-010-10-04 Full Text: PDF
Socialization of Utilization of Coastal Boundary Space and Coastal Abrasion in South Galesong District K, Riswal.; Maricar, Farouk; Thaha, Muh Arsyad; Lopa, Rita Tahir; Mustari, A. Subhan; Bakri, Bambang; Pongmanda, Silman; Pallu, Muh. Saleh; Hatta, Mukhsan Putra; Puspita, A. Ildha Dwi
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 1 (2025): Community Empowerment through Higher Education Community Service Programs
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i1.564

Abstract

South Galesong District, South Sulawesi, is a coastal area facing a serious threat due to beach erosion, exacerbated by the improper use of coastal setback areas that do not align with their ecological functions. The South Galesong District Government and the community of Mangindara Village, as partners in this program, face challenges in sustainably managing coastal setback areas. This community service program aims to raise public awareness and understanding of coastal setback management and erosion mitigation through various educational methods and community-based training. The implemented methods include lectures, distribution of educational leaflets and banners, as well as pre-test and post-test assessments to measure the improvement in public understanding. Additionally, community-based mitigation training was conducted using a hybrid approach that combines nature-based solutions and engineering techniques for erosion control. Baseline evaluation through questionnaires indicated that the initial level of public understanding regarding coastal setbacks and erosion issues ranged between 27% and 37.5%. After the program, post-test results showed a 40% increase in understanding of coastal protection structure planning, with an overall average improvement of 35.66%. Based on the results of this community service program, it can be concluded that the socialization of coastal setback utilization and beach erosion has had a significantly positive impact on public understanding in South Galesong District. The educational materials proved effective in increasing awareness of the importance of coastal setbacks, the risks of erosion, and the planning of protective coastal structures. Moving forward, it is expected that fishermen and communities residing in coastal setback areas will have an even greater awareness of the importance of sustainable coastal setback utilization in accordance with ecological functions, as well as a better understanding of coastal erosion.
Sosialisasi Manfaat Moda Transportasi Publik Berbasis Rel untuk Peningkatan Animo Penggunaan Kereta Api di Rute Maros-Barru Sulawesi Selatan Ramli, Muhammad Isran; Adisasmita, Sakti Adji; Sabil, Muhammad Ikhsan; Yatmar, Hajriyanti; Tjaronge, Muhammad Wihardi; Bakri, Bambang; Hustim, Muralia; Aly, Sumarni Hamid; Tarakka, Rustan; Sirajuddin, Yahya; Chaerunnisa, Andi Sitti
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 1 (2025): Community Empowerment through Higher Education Community Service Programs
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i1.574

Abstract

The Maros-Barru railway is a strategic route to be developed as a public transportation mode that can connect two important areas in the province of South Sulawesi. However, even though the railway infrastructure in this area already exists, the level of train use by the community is still quite low. The demand for this travel need is significant for planning purposes, both facilities and infrastructure, especially transportation. The lack of public interest in trains on the Maros-Barru route is caused by several factors, one of which is the lack of information received by the community regarding the benefits and comfort offered by trains. Socialization of the benefits of rail-based public transportation will be carried out through various communication channels to reach more passengers, and it is hoped that this activity will benefit policymakers in the management and planning of trains in Sulawesi and reduce transportation problems. Before the socialization, there was no value, but after the socialization, a value of 2984 was obtained, which was in the range of 2501-3250, with the criteria Good. This means that this activity is also expected to be a preference for public transportation modes, especially trains, and the transition from other transportation modes to trains.
Peningkatan Kualitas Hidup dan Resiliensi Masyarakat Bontoa Melalui Sosialisasi Rumah Layak Huni, Sehat dan Tahan Gempa ., Fakhruddin; Parung, Herman; Tjaronge, Wihardi; Djamaluddin, Rudy; Irmawaty, Rita; Caronge, Muhammad Akbar; Bakri, Bambang; Mushar, Pratiwi; Harusi, Nurul Masyiah Rani
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 1 (2025): Community Empowerment through Higher Education Community Service Programs
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i1.576

Abstract

Permasalahan kualitas hunian di Desa Pajukukan, Kecamatan Bontoa, Kabupaten Maros, Sulawesi Selatan, menjadi isu krusial yang memerlukan perhatian segera karena banyaknya rumah tidak layak huni dengan konstruksi lemah, sanitasi buruk, dan ventilasi tidak memadai. Kondisi ini tidak hanya membahayakan kesehatan dan keselamatan penghuni, tetapi juga meningkatkan risiko kerusakan dan korban saat terjadi bencana, seperti banjir dan gempa bumi. Kegiatan ini bertujuan untuk meningkatkan pemahaman masyarakat tentang pentingnya rumah layak huni, sehat, dan tahan gempa melalui sosialisasi yang melibatkan metode ceramah, demonstrasi, dan diskusi kelompok. Subjek kegiatan terdiri dari 25 peserta yang mencakup perwakilan keluarga dan pemangku kepentingan di Kecamatan Bontoa. Observasi dilakukan untuk mengukur pemahaman awal dan akhir peserta serta efektivitas sosialisasi dalam menyampaikan informasi terkait teknik pembangunan rumah aman, pemilihan bahan bangunan lokal, dan perawatan berkala. Hasil kegiatan menunjukkan peningkatan signifikan dalam pemahaman peserta, dengan skor pre-test sebesar 40% yang meningkat menjadi 82% pada post-test. Hal ini mengindikasikan bahwa peserta memiliki pemahaman yang baik mengenai prinsip dasar konstruksi rumah tahan gempa serta pentingnya ventilasi dan sanitasi yang optimal. Dampak positif lainnya adalah munculnya inisiatif dari beberapa peserta untuk memperbaiki rumah mereka dengan menerapkan prinsip-prinsip yang diajarkan. Selain meningkatkan kesadaran, kegiatan ini juga mendorong pemanfaatan bahan bangunan lokal sebagai langkah untuk mendukung ekonomi masyarakat setempat. Dengan pendekatan edukasi dan pemanfaatan sumber daya lokal, kegiatan ini diharapkan memberikan dampak berkelanjutan dalam upaya menciptakan hunian yang lebih layak, sehat, dan tahan gempa, serta meningkatkan kualitas hidup masyarakat di daerah rawan bencana.
STUDY ON THE DEVELOPMENT AND PERFORMANCE OF WATER DISTRIBUTION NETWORKS IN LANGARA URBAN AREA, SOUTHEAST SULAWESI DARMAWAN, ILHAM KARI BUDI; Bakri, Bambang; Ibrahim, Roslinda; Arai, Yasuhiro; Jumain, Mazlin
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 8, NUMBER 2, OCTOBER 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v8i2.23293

Abstract

Aims: This study was aimed to evaluates the development of the water distribution network in the IKK PDAM Lama of Konawe Kepulauan Regency- Southeast Sulawesi Province, Indonesia, particularly in West Wawonii Sub-district, which faces the challenge of increasing water demand due to population growth and urbanization. Methodology and results: The study utilized survey methods of water pressure, discharge, and physical condition of the network, as well as secondary data such as network maps and PDAM technical reports. Water demand projections were conducted based on the technical standards of the Minister of Public Works and Housing Regulation No.27/PRT/M/2016, with network hydraulics simulations using EPANET 2.2 software to analyze water pressure and flow under existing conditions and after network development. Conclusion, significance and impact study: Simulation results indicate that the water distribution network developed in 2025 fails to meet community demand, evidenced by negative pressure zones requiring network design revision. Initial optimization involved increasing the main pipe diameter to 150 mm and using Galvanized Iron Pipe (GIP) to reduce leakage, which satisfied demand until 2035 but fell short by 2040. Further optimization increased the main pipe diameter to 200 mm and the divider pipe to 160 mm, successfully meeting water demand until 2045. This study highlights the necessity of sustainable planning and continuous optimization in water distribution networks to maintain adequate service pressure and reliable clean water supply, especially in rapidly growing urban areas.
Detection of River Change in Modeling Flood Vulnerability using Support Vector Machine (SVM) Methods in Tallo River Makassar City Izzaty, Atika; Aprian, Syahra Dewi; Wijayanti, Regita Faridatunisa; Bakri, Bambang
Geoid Vol. 20 No. 2 (2025)
Publisher : Departemen Teknik Geomatika ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/geoid.v20i2.7536

Abstract

The transformation of river morphology and the rising frequency of flooding in urban environments have emerged as increasingly concerning environmental challenges, particularly in Makassar City. The Tallo River, one of the primary waterways traversing the city, exhibits notable dynamic changes driven by both natural processes. In the contemporary era, flooding stands as one of the most recurrent natural disasters, occurring unpredictably and posing serious risks, especially in major metropolitan areas. Such events frequently disrupt daily activities, leading to traffic congestion and obstructing ground transportation. Residential zones situated near riverbanks are particularly vulnerable to its impacts. Moreover, climate change exacerbates these conditions by contributing to increasing environmental unpredictability and need through a monitoring. The purpose of this research is to analyze river morphology changes and assess flood susceptibility in the Tallo River, Makassar City, using Support Vector Machine (SVM) classification methods. Approximately, there are 20% of the area experienced significant changes during 2018 in Tallo River. As water discharge continues to increase, the volume of water mass also rises accordingly. To detect the spatial distribution of flood vulnerability along the Tallo River, which flows through Makassar City, this study utilizes Land Use and Land Cover (LULC) data from 2017 and 2024. These datasets were classified using the Random Forest model, achieving accuracies of 0.89 and 0.87, respectively values that meet the standards for land use change accuracy. Flood vulnerability is also influenced by low elevation values, particularly areas below 0 meters, which are classified as wetland zones. In the Tallo River area, which is part of the Jeneberang Watershed, the dominant class is moderate flood vulnerability, covering approximately 138.48 hectares. Remote sensing technology combined with machine learning approaches especially supervised classification techniques widely used for both binary and multivariate classification tasks, demonstrating high accuracy in detecting and classifying flood vulnerability.
Struktur Hybrid Engineering sebagai Permeable Breakwater untuk Mereduksi Energi Gelombang pada Pantai Berpasir Hafid, Hendra; Thaha, Muhammad Arsyad; Maricar, Farouk; Bakri, Bambang
Prosiding Seminar Nasional Teknik Sipil UMS 2022: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (277.981 KB)

Abstract

Penelitian ini bertujuan untuk menemukan pengaruh porositas pada struktur Hybrid Engineering sebagai permeable breakwater sebagai salah satu alaternatif untuk meredam energi gelombang yang menyebabkan abrasi pantai. Metode penelitian yang digunakan adalah eksperimental laboratorium dengan permodelan fisik membuat prototype dan mengadakan pengujian pada kolam uji (wave flume) untuk mengetahui deformasi gelombang terhadap adanya struktur hybrid engineering dengan beberapa skenario model dengan merubah porositas atau kerapatan dari brushwood terhadap ketinggian muka air, panjang dan periode gelombang. Energi gelombang dihitung pada lokasi di depan struktur dan di belakang struktur. Perhitungan dilakukan dengan membandingkan energi gelombang pada kedua lokasi tersebut sehingga dapat diketahui pengaruh struktur hybrid engineering terhadap efisiensi peredaman energi. Pengaruh dimensi struktur terhadap peredaman energi gelombang tertinggi diperoleh dengan nilai peredaman enenergi tertinggi adalah pada saat kondisi h/d = 0.75 dimana kondisi tersebut ketinggian struktur lebih tinggi dari permukaan air. Pada kondisi peredaman energi gelombang jika dibandingkan dengan kedalaman perairan (d) nilai peredaman energi terbesar adalah pada saat d = 15 cm, sehingga dalam pemanfaatanya sebagai peredam energi gelombang ketinggian struktur harus lebih tinggi dari ketinggian Mean sea level (MSL) diperarian yang akan ditempatkan struktur permeable breakwater.
Co-Authors A Ilda Puspita A. Kresna Jaya Adisasmita, Sakti Adji Ahmad Sumakin Akbar, Muhammad Taufiq Amran Amran Aprian, Syahra Dewi Arai, Yasuhiro Arsyad Thaha Aslamil Taqwa Caronge, Muhammad Akbar Chaerunnisa, Andi Sitti Darmawan, Ilham Kari Budi Djamaluddin, Rudy Djunur, Lutfi Hair Farauk Maricar Farouk Maricar Hafid, Hendra Harusi, Nurul Masyiah Rani Ibrahim, Roslinda Ildha Dwi Puspita Irmawaty, Rita Izzaty, Atika Jumain, Mazlin K, Riswal. Lopa, Rita Tahir Malkab, Magfirah Maricar, Farouk Muh Arsyad Thaha Muh Saleh Pallu Muh. Idil Islami Muhammad Farid Maricar Muhammad Isran Ramli Muhammad Saleh Pallu Muhammad Wihardi Tjaronge Mukhsan Hatta Mukhsan Putra Hatta, Mukhsan Putra Muralia Hustim Mushar, Pratiwi Mustari, A. Subhan Mustari, Andi Subhan Nabilah Shahnaz Pallu, Muhammad S. Parandangi, Afbiantir Parung, Herman Pongmanda, Silman Puspita, A. Ildha Dwi Rahma, Siti Hardiyanti Riswal Karamma Rita Lopa Rita Tahir Lopa Rombebunga, Yunarto Rosyidi, Adi Rustan Tarakka Sabil, Muhammad Ikhsan Saleh Pallu Silman P Manda Silman Pongmanda Sirajuddin, Yahya Subhan Mustari Sulhairi, Sulhairi Sumarni Hamid Aly Sunusi, Sulhairi Thaha, Muhammad Arsyad Wihardi Tjaronge Wijayanti, Regita Faridatunisa Yatmar, Hajriyanti