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All Journal International Journal of Renewable Energy Development SITEKIN: Jurnal Sains, Teknologi dan Industri Journal of Educational Research and Evaluation ComTech: Computer, Mathematics and Engineering Applications Spektrum Sipil Journal of the Civil Engineering Forum INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY
Oki Setyandito, Oki
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Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Public Health Social Sciences Transportation Other

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SHORELINE CHANGE WITH GROIN COASTAL PROTECTION STRUCTURE AT NORTH JAVA BEACH Setyandito, Oki; Purnama, Aldo Christanto; Yuwono, Nur; Juliastuti, Juliastuti; Wijayanti, Yureana
ComTech: Computer, Mathematics and Engineering Applications Vol 11, No 1 (2020): ComTech (Inpress)
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v11i1.6022

Abstract

The research aimed to study the effect of groin application to erosion at the shoreline. The method utilized the bathymetry and topography data of north beach of Balongan, West Java. Modeling of the shoreline change due to groin installment used software called GENESIS. Based on analysis result, it is found that the significant wave direction comes from the southeast with significant wave height of 1,18 meters and surf zone width of 140 meters. It is concluded that at research area of north beach of west Java, I-groin with length of 70 meters and T head groin of 60 meters in long T-groin effectively overcome erosion and advance the coastline by 10786,62 m2 orin av erage 6,3 meters.
Numerical Analysis of Velocity Magnitude on Wave Energy Converter System in Perforated Breakwater Setyandito, Oki; Nizam, Nizam; Pierre, Andrew John; Suputra, Gede Dharma; Wijayanti, Yureana; Anda, Martin
International Journal of Renewable Energy Development Vol 11, No 1 (2022): February 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.38535

Abstract

Waves are an alternative energy source that can be used for electricity generation. Wave Energy Converter (WEC) system in perforated breakwater is potentially applicable WEC system for coastal area. The magnitude of wave energy generated is determined by the volume of sea water inside the perforated breakwater. This volumetric flow rate is calculated using the flow velocity at perforated holes on the structure slope. Therefore, this research aims to study the velocity magnitude by analyzing the interrelation among wave steepness, wave run-up and relative velocity. The method used consists of applying numeric 3D flow model in the perforated structure of the breakwater with the variation of wave height, wave period and structure slope. The result shows that, the steeper the structure, the bigger is the relative run up (Ru/H). The higher the relative run up, the higher are the relative run-up velocities (V/Vru). As the velocity increase, the volumetric flow rate inside perforated breakwater will be higher, which leads to higher wave energy. Hence, it can be concluded that the higher the velocities (V/Vru), the higher is the wave energy generated.
Field Study of Deposit and Erosion Patterns around Pandanus Clusters on Sandy Coasts: a Preliminary Investigation Nizam; Benazir; Ibrahim, Muhammad S. I.; Setyandito, Oki; Purnomo
Journal of the Civil Engineering Forum Vol. 11 No. 1 (January 2025)
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.13286

Abstract

Coastal zones are inherently dynamic, often resulting in long-term cumulative impacts such as erosion, which can potentially escalate into disasters. Discussions regarding nature-based solutions, particularly the utilization of coastal forests, have gained prominence due to their environ[1]mental benefits. This paper investigates the role of vegetated coasts in mitigating the effects of wave attacks on land, focusing specifically on Coastal Pandanus species. We conducted a systematic monitoring effort to quantify land changes directly around these species in the field. The southern coast of Java, characterized by significant coastal processes, served as the investigation site. We monitored the changes in the foredunes of eight Pandanus clusters identified along a 1 km stretch of the Pandansari and Samas coasts in the Special Region of Yogyakarta, Indonesia. Our systematic monitoring, conducted biweekly from September to December 2023, involved precise measurements of land elevation, sediment deposition, and erosion around the Pandanus clusters. We utilized manual leveling surveys and installed erosion pins to enhance the precision of our topographic assessments. These monitoring techniques allowed us to thoroughly examine the relationship between Pandanus cluster characteristics and coastal processes. Our findings illuminate the pivotal role of Pandanus clusters in shaping coastal profiles, which depend on cluster area and growth characteristics. Additionally, we underscore key points regarding their success rates, limitations, and future strengthening efforts through the implementation of this nature-based solution. This research contributes to a deeper understanding of the complex interactions between coastal dynamics and vegetative elements, paving the way for informed coastal management strategies in the future.
The The Barriers in Online Assessment for Professional Certification: A Case Study In Indonesia Citra Manggalasari, Lena; Jantos, Anne; Koehler, Thomas; Yuliastuti, Yuliastuti; Wijayanti, Yureana; Setyandito, Oki; Sutarto, Sutarto; Wisni Septiarti, Serafin
Journal of Education Reseach and Evaluation Vol 7 No 1 (2023): February
Publisher : LPPM Undiksha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jere.v7i1.53839

Abstract

Certification exams conducted online must be of the same quality as those conducted on-site. To achieve this, it is necessary to conduct a study in which assessors need to identify obstacles in implementing online certification examinations which have been implemented during the Covid-19 pandemic. The study aims to analyze the perspective of the assessors to identify the barrier factors, understand the interrelation among them, and propose improvements to the online application process. The method applied was the MICMAC (Matrix of Cross-impact Multiplications Applied to Classification), a structural model, to analyze the variables based on their influence and dependence driving force. A case study was conducted on the Indonesia Hydraulic Engineer Association. The data was collected from a focus-group discussion with the assessors. The result revealed that the barrier factors consist of technical aspects, such as internet connection delay, hackers and viruses, and unverified e-document; and social aspects, such as questioning skills limitation, non-verbal communication skills limitation, and environment distraction. The study found that internet connection delay and questioning skill limitations are the barriers with the highest influence beyond other barriers in the online assessment process. Also, the questioning skills limitation factor has the highest dependency on other barriers. Hence, it can be proposed that the curricula of the assessors’ training and/or certification program, should be incorporated with the questioning skill in an online assessment environment.
Analysis on Construction Cost Estimation Ministry Regulation Year 2016 and Year 2022 for Construction Projects Putra, Andi Bayu; Setyandito, Oki
SITEKIN: Jurnal Sains, Teknologi dan Industri Vol 20, No 2 (2023): June 2023
Publisher : Fakultas Sains dan Teknologi Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/sitekin.v20i2.21790

Abstract

Cost is one of the 3 most important project management components, with the other two being Quality and Time. The calculation of construction work costs in detail is regulated in Indonesia by a Ministry  Regulation. This Ministry  Regulation has only undergone changes in 2022, which replaces and/or fixes several existing rules in the previous Regulation issued in 2016. For brevity, the two Regulations is shortened to regulation 2016 and regulation 2022. Of course, the accuracy of these regulations is especially important regarding the smooth implementation of projects. This study uses the two Ministry  Regulations on two different Construction Projects to see analyse the different result of cost calculation caused by the regulation change. This change itself is important to be understood to continuously improve the Ministry  Regulation regarding cost estimation. In conclusion, regulation 2022 can produce a more accurate results, with regulation 2016 often gives a higher cost estimation than regulation 2022. For future research it is best to analyse other type of construction infrastructure to gain more insight into which estimation that can still be improved in the future.
TEMPORAL VARIATION OF GROUNDWATER QUALITY IN SLEMAN, YOGYAKARTA, INDONESIA Wijayanti, Yureana; Fittkow, Markus; Kusumadewi, Riana Ayu; Setyandito, Oki
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 5, NUMBER 1, OCTOBER 2021
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v5i1.10746

Abstract

Groundwater quality evaluation is important to gain an insight of contamination source. It can later be utilized to review the implementation of a water resource management policy in a specific region. Aim: This study evaluate the short-term temporal variation of groundwater quality and its possible contamination source in Sleman, Yogyakarta. Methodology and Results: the statistical approach was utilized using boxplot, principle component analysis (PCA) and correlation matrices, to the data for 50 sampling sites. The data of groundwater quality are available from the local environmental authority of Environmental Agency Sleman.The box plots revealed that groundwater quality might largely influenced by rainfall in the area. The factor loading of PCA presented that the ratio of concentration of both chloride and TDS are the most varied of all samples, and the less variable parameter is fluoride. The pair of groundwater quality parameter which had strong correlation were varied in each year, except for TDS and chloride that showed strong correlation in all three years. Nitrite had strong correlation with iron in 2017 and, nitrite also had strong correlation with both manganese and fluoride in 2019. The existence of fluoride in correlation with other parameter might give an insight of contamination from livestock wastes, where in the study area there are many poultry and cow farms, and small scale chicken slaughter industries. Conclusion, significant and impact study: This study gives preliminary understanding on temporal variation of groundwater quality, for further research on groundwater quality in Sleman, Yogyakarta.
STUDY OF MODIFIED PERFORATED BREAKWATER AS RENEWABLE ENERGY DEVICE Setyandito, Oki; Novandy, Novandy; Nizam, Nizam; Anda, Martin; Kusumadewi, Riana Ayu; Wijayanti, Yureana
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 5, NUMBER 2, APRIL 2022
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v5i2.13536

Abstract

Aim: This study investigates to determine the influence of wave steepness, relative freeboard, and breaker parameters on overtopping discharge at a perforated breakwater. Methodology and results: The research method used was using both a numerical model simulations on three-dimensional computational fluid dynamics (CFD) modelling software namely FLOW-3D; and empirical equation computation. The evaluation of both approaches were performed for understanding the characteristics of wave discharge that overtopping the perforated breakwater. The experimental results of modified perforated breakwater revealed that the lowest slope possible with the highest porosity possible can generate the highest value of dimensionless overtopping discharge for wave energy harvesting. Conclusion, significance and impact study: The findings of this study formulated the optimum slope and porosity to the highest wave energy harvested. Further studies recommend that data collection from onsite trials of modified perforated breakwater are performed.
PENGARUH FASILITAS PELABUHAN TERHADAP PANTAI LABUHAN HAJI: The Effect of Port Structure on Labuhan Haji Beach Pradjoko, Eko; Prayoga, Haris; Setyandito, Oki
Spektrum Sipil Vol 2 No 1 (2015): SPEKTRUM SIPIL
Publisher : Jurusan Teknik Sipil Fakultas Teknik Universitas Mataram

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

Abstract

Gelombang yang merambat dari laut dalam menuju pantai akan mengalami perubahan karakteristik gelombang (transformasi) karena berkurangnya kedalaman laut. Adanya fasilitas pelabuhan juga dapat menyebabkan gelombang menjadi terganggu sehingga merubah angkutan sedimen dan kondisi pantai di sekitar pelabuhan, seperti yang terjadi pada pantai Labuhan Haji Kabupaten Lombok Timur. Fasilitas pelabuhan yang dibangun sekitar tahun 2009 menyebabkan perubahan pada kondisi pantai di sekitarnya. Penelitian ini bertujuan menyajikan perubahan pantai yang terjadi berdasarkan pengukuran lapangan dan menganalisa pengaruh fasilitas pelabuhan tersebut dengan simulasi numerik. Pengukuran profil dan garis pantai dilakukan satu kali dalam sebulan sejak Desember 2012 sampai Juni 2013. Simulasi perubahan garis pantai menggunakan model GENESIS dan hasil simulasi transformasi gelombang dari model RCPWAVE yang memperhatikan kondisi kedalaman dasar laut yang tidak beraturan. Simulasi dilakukan dalam dua periode, periode pertama sejak dibangunnya bangunan pelabuhan pada tahun 2009 sampai 2012 dan periode kedua selama 10 (sepuluh) tahun ke depan sejak tahun 2012 sampai 2022. Hasil pengukuran lapangan menunjukkan fluktuasi dan bahkan kemunduran garis pantai di kedua sisi Pelabuhan Labuhan Haji. Hasil tersebut memiliki hubungan dengan membesarnya kondisi gelombang selama pengukuran (Desember ~ Juni). Pengaruh fasilitas pelabuhan terlihat pada hasil simulasi numerik perubahan garis pantai, di mana hasil simulasi periode pertama menunjukkan garis pantai di sebelah kanan pelabuhan maju sejauh ± 36.8 m sedangkan di sebelah kiri pelabuhan mundur sejauh ± 2.5 ~ 17.0 m. Simulasi periode kedua selama 10 tahun ke depan sampai tahun 2022 masih menunjukkan hasil yang sama dan bahkan prediksi perubahan yang terjadi bertambah besar, yaitu garis pantai di sisi kanan pelabuhan maju hingga sejauh ± 62.4 m dan di sisi kiri pelabuhan mundur hingga sejauh ± 20.0 ~ 37.0 m.
Co-Authors Anda, Martin Benazir Citra Manggalasari, Lena Eko Pradjoko Fittkow, Markus I Dewa Gede Dharma Suputra Ibrahim, Muhammad S. I. Jantos, Anne Juliastuti Juliastuti Koehler, Thomas Kusumadewi, Riana Ayu Nizam Nizam Mr., Nizam Nizam Nizam Novandy, Novandy Nur Yuwono Pierre, Andrew John Prayoga, Haris Purnama, Aldo Christanto Purnomo Putra, Andi Bayu Radianta Triadmadja Serafin Wisni Septiarti Sutarto Sutarto Wijayanti, Yureana Wijayanti, Yureana Yuliastuti Yuliastuti