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Capturing safely the sun rays: Dam risk management related to installation of floating photovoltaic cells

AIP Conference Proceedings 2024年第1期3215卷

作者： Raymond Valiant Bella K. P. Cantik Civil Engineering Study Program University of Indonesia Depok Indonesia 16424 Executive Member of the Indonesian Committee on Large Dams (INACOLD) Certified Professional in LargeDams Management Indonesia 10350 Civil Engineering Study Program Pradita University Tangerang Indonesia 15810

The worldwide consensus on the demand for low-carbon advancement has stimulated active development to promote photovoltaic technology as a renewable energy source. Currently developed, Floating Photovoltaic (FPV) cells, are typically installed on tranquil water surfaces like lakes and reservoirs. FPVs installed on the multipurpose reservoirs’ surface are related to dam safety practices. The purpose of this study is to assess and quantify the hazards from installing floating facilities on the reservoirs’ surface, identify the dominant factors contributing to the risk’s severity and likelihoodof FPV implementation at reservoirs in Indonesia. The research output are recommendations for guideline and standards to mitigate risks that will affect the dam’s safety. The research selected Cirata Dam, Kedungombo Dam, Karangkates Dam,and Mamak Dam as its focal points. The method used in this study is the quantitative method with a risk matrix approach arranged based on the severity and likelihood of various risks, classified into five aspects, namely technical, financial, environmental, regulation, and social. This matrix is cascaded by identifying areas and levels of risk that require treatmentby developing guidelines and standards. Key areas where the guidelines and standards are required comprise specified technical aspects of the FPV construction, environmental impacts on the reservoir, regulation, and financial system of the FPV development. The result of this study indicates that the FPV risk distribution value for the selected dams exhibit a similar range of severity and likelihood range from 59%-63% and 41%-53%, respectively. Furthermore, the environmental and technical aspects are determined as the most dominant aspect influencing severity. Specific recommendations are developed based on these findings.

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The Effect of Filter Media Size and Loading Rate to Filter Performance of Removing Microplastics using Rapid Sand Filter

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Journal of engineering and Technological Sciences 2022年第5期54卷

作者： Fajar, Mutiara Sembiring, Emenda Handajani, Marisa Environmental Engineering Study Program Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Environmental Engineering Department Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Huwi Kec. Jati Agung South Lampung 35365 Indonesia

Microplastics (MP) can pose a serious threat to the environment and human health because of their tiny size and ability to spread easily in water. One of the alternative treatments to remove MP from water is the rapid sand filter (RSF). The objective of this study was to analyze the effects of filter media size and loading rate on RSF performance in removing MP. The applied filter media was silica sand with effective sizes (ES) of 0.39 and 0.68 mm. The loading rates of filtration were 4;6;8 and 10 m3/m2-h. The MP samples were made from plastic bags and torn tires (artificial samples: 10 to 800 µm). This study showed that the MP removal percentage was up to 96.6% (MP size larger than 200 µm). The head loss increment for loading rates 4;6;8;10 m3 /m2-h was 0.16;0.35;0.34;0.25 m (ES 0.39 m) and 0.10;0.18;0.18;0.19 m (ES 0.68 m)), respectively. Meanwhile, the filtration cycle for loading rates 4;6;8;and 10 m3/m2-h was 5, 2, 2, and 1 days (ES 0.39 mm) and 9, 4, 3, and 3 days (ES 0.68 mm), respectively. The result of this study showed that the smaller the filter media size, the higher the head loss of the filter media bed. Furthermore, there is an increased head loss of the filter media bed when the loading rate is greater. © 2022 Published by ITB Institute for Research and Community Services,.

关键词： Microplastic

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LIDAR and HEC-RAS on-grid precipitation model for irrigation drainage system

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AIP Conference Proceedings 2024年第1期3026卷

作者： Budianto Ontowirjo Muhammad Ihsan Gesa Hayu Irham Haris Wahyudi Civil Engineering Study Program Bakrie University HR Rasuna Said no. C-22 Jakarta Indonesia Civil Engineering Department University of Indonesia Jakarta Indonesia

Analysis of the hydraulic model of the carrier channel, discharge channel and tertiary plot of the Irrigation Area is needed to understand how to estimate and measure the flow rate in the carrier channel, discharge channel and tertiary plot in the event of rain with extreme intensity. The capacity of the Saddang River Irrigation Canal will be increased by 30% to accommodate long-term irrigation discharge needs. To optimize the ability of the cultivation field, irrigation and drainage channels, an evaluation was carried out using the 2-D finite-volume numerical method for hydrodynamic and sediment transport models. It solves the 2-D dynamic wave equations (the standard depth-averaged *** equations) that are mainly used for river simulation. The HEC-RAS model uses a flexible mesh that may contain arbitrarily quadrilateral and triangular cells. A hybrid mesh may achieve the best compromise between solution accuracy and computing demand. The HEC-RAS model solved variables include water surface elevation, water depth, depth averaged velocity, Froude number, and bed shear stress. The optimization of the model is useful for improving the drainage modulus, lining channel, drain time period and the performance of the drainage channel.

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study of the use of CaCO3 in the mixture of laston AC-BC as a filler

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AIP Conference Proceedings 2023年第1期2882卷

作者： Indra Putra Kurnia Falderika Civil Engineering Study Program Universitas Komputer Indonesia Bandung West Java Indonesia

The abundance of limestone material deposits in Indonesia shows the great potential of applying local material technology to be used in road pavement mixes. Calcium Carbonate is a chemical compound with the chemical formula CaCO3 is a substance commonly found in rocks, one of which is limestone. This study aims to analyze the characteristics of the AC-BC asphalt mixture by utilizing CaCO3 material as a filler to increase the performance of the AC-BC asphalt mixture. The AC-BC layer is part of the surface layer which is located between the base course and the wearing course where its two main functions are to reduce stress and withstand the highest loads due to traffic loads. The tests were carried out based on the empirical method with the Marshall test which refers to the provisions of the properties of the Laston mixture (AC-BC) General Specifications of Highways and Bridges in 2018.

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Expert choice as an alternative application of AHP method to determine maintenance priority of office buildings in Subang district

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AIP Conference Proceedings 2024年第1期2710卷

作者： Iskandar Muda Purwaamijaya Rina Marina Masri Muhammad Arik Farhan Fuadi Civil Engineering Study Program Universitas Pendidikan Indonesia Dr. Setiabudhi Street No 207 Bandung Indonesia 40154

A government-owned building, after being functional, must be guarded with proper maintenance techniques. To realize a building that is safe and in good condition, all elements of the building system need to be organized through maintenance work. Maintenance is very important and must be done regularly to support the optimal performance of the building’s usefulness. The priority scale for the maintenance of district government assets must be done. There are several alternative ways that can be done in determining the priority of maintaining the government-owned building. Expert Choice application is an alternative choice of the Analytical Hierarchy Process (AHP) method. This application can help determine decision making in prioritizing maintenance activities of government-owned office buildings. The research is located in Subang Regency, West Java. The research was conducted from August 2020 to October 2020. The study was conducted using the AHP (Analytical Hierarchical Process) method of the Expert Choice application model. This model can describe several problem criteria that describe a structured and systematic hierarchy of building maintenance. The results of the alternative analysis of the AHP method using the Expert Choice application show that overall the structural components of an office building in Subang Regency are in good condition. The solution is obtained by using the AHP method, the Expert Choice application model. Maintenance activities are more precisely targeted because the results of data collection are more accurate so that the priority scale can be carried out according to planning.

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Syntheses of building treatment and waste water management in palm oil industry to make a sustainable industry development

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AIP Conference Proceedings 2024年第1期2710卷

作者： Rina Marina Masri Iskandar Muda Purwaamijaya Kathlien Nurfajrin Civil Engineering Study Program Universitas Pendidikan Indonesia Dr. Setiabudhi Street No 207 Bandung Indonesia 40154

The palm oil industry produces liquid, gaseous and solid waste. The waste that causes the most problems is liquid waste because every ton of fresh fruit bunches processed can produce about 60% of liquid waste compared to the total other waste. The research objective is to have a comprehensive impact on the environmental, financial, and technical aspects of the wastewater treatment plant. The research was conducted at PT. Hindoli (A Cargill Company), PulauRimau District, Banyuasin Regency, South Sumatra on weekdays (Monday-Saturday). The research method uses a system purposive technique. Secondary data comes from literature study, ANDAL PT. Hindoli, land maps, administrative maps and field photos. The results showed that the wastewater treatment process was carried out to reduce the content of chemical compounds in wastewater. The total area of the WWTP is 10 hectares with a retention time in the wastewater treatment pond for 134 days for a production of 60 tons / hour. The land change analysis shows that the oil palm plantation and mill areas under study are in good and medium land suitability zones. The form of land change is a transition from plantation forest to oil palm plantations. The solution to the technical problems of a wastewater treatment plant is to use a centrifugal pump, the embankment must be covered with concrete, periodic dredging with an excavator or using the Micro-Lift bacteria to speed up the breakdown of sludge. The land change analysis shows that the oil palm plantation and mill areas under study are in good and medium land suitability zones. The form of land change is a transition from plantation forest to oil palm plantations. The solution to the technical problems of a wastewater treatment plant is to use a centrifugal pump, the embankment must be covered with concrete, periodic dredging with an excavator or using the Micro-Lift bacteria to accelerate the breakdown of sludge. The land change analysis shows that the oil palm plantation and

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The impact of internal risk factors on cost of drainage projects in Aceh Province

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AIP Conference Proceedings 2024年第1期3082卷

作者： Suci Tiara Agus Mubarak Mubarak Fachrurrazi Fachrurrazi Maimun Rizalihadi Ziana Ziana Master of Civil Engineering Study Program Universitas Syiah Kuala Banda Aceh 23111 Indonesia Department of Civil Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia

This study was intended to analyzed the impact of risk on costs for the implementation of the urban drainage projects in Aceh Province. The object of study was the projects implemented during the 2021 fiscal year and covering 17 districts or cities of Aceh. The projects were generally built as infrastructure for residential areas. The data of the impact on costs was collected through the distribution of questionnaires involving 52 respondents who had a direct role in project implementation. The questionnaire was designed in 3 parts that inform the respondent’s characteristics, the company characteristics, and the risk impact on costs for 10 internal factors and 71 variables. The impact of risk was measured used the severity index (SI) parameter with 5 impact criteria. This study found the highest risk impact on costs was in the "moderate" criteria and appeared in 4 variables, namely: the inaccuracy of cost estimates (SI=0.450), design which differs with site conditions (SI=0.419), material price increases (SI=0.388), and design changes in response to site measurements and investigation (SI=0.381). For impacts with moderate criteria, the constructors should anticipate the potential emergence of additional project costs by 2% to 3% of the budget.

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Analysis of the risk impact of internal factors on time in building construction projects in Aceh Province

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AIP Conference Proceedings 2024年第1期3082卷

作者： Tri Yolanda Ariska Mubarak Mubarak Saiful Husin Febriyanti Maulina Mahmuddin Mahmuddin Master of Civil Engineering Study Program Universitas Syiah Kuala Banda Aceh 23111 Indonesia Department of Civil Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia

The implementation of construction projects is always faced with the risk of delays in the completion of works. Recognizing the impact of risks are the realistic efforts that can be applied to minimize the potential for delays. This study was conducted to identify and analyze the impact of risk on time on the implementation of building construction projects in Aceh Province. This study focused on 35 building projects that were built during 2021. Data collection was carried out by using a questionnaire instrument designed to identify the impact of risk on 10 internal factors and 71 variables. The risk impact was determined by using the severity index (SI) parameter. The results of the analysis describe that the highest impact of risk on time was categorized in the "Medium" intensity of impact for 22 variables (31%). The medium impact of risks were distributed on factors of material (3 variables), equipment (5 variables), finance (5 variables), construction methods (2 variables), labor (1 variable), contractor managerial (1 variable), construction safety (2 variables), contract (1 variable), and design (2 variables). The highest risk impact appears in the variable of design which differs with site conditions (J1) with an SI value of 0.606.

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Analytical and dynamic loading test evaluation of fly over “X” foundations, Bandung city, Indonesia

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AIP Conference Proceedings 2024年第1期3077卷

作者： Aditia Febriansya Iskandar Iskandar Mulyadi Yuswandono Andri Krisnandi Somantri Nadya Amelia Rubinaufal Arfariq Yahya Department of Civil Engineering Politeknik Negeri Bandung Bandung 40559 Indonesia Highway and Bridge Design Engineering Study Program Department of Civil Engineering Politeknik Negeri Bandung Bandung 40559 Indonesia

In this paper, the evaluation of Fly Over “X” foundations will be discussed based on analytical and dynamic loading test whether the foundation meets safety criteria or not, and the strengthening of foundation are proposed in this paper. During the construction of Fly Over “X” substructure, it was found that the result of loading test of bore pile foundation in Pier 5 and Pier 18 did not meet the minimum requirements and specification. The loading test was carried out using Pile Driving Analyzer or PDA resulting in the ultimate bearing capacity of Pier 5 and Pier 18 foundation each are 397 Ton and 515 Ton, while the bearing capacity criteria need to meet is 675 Ton. In this paper, analytical and loading test evaluation of Fly Over “X” foundation is presented to determine whether the foundations are able to withstand external loads according to Indonesian Standard. Standard penetration test result also used to determine the allowable bearing capacity and total settlement of foundations. Based on the evaluation result, the foundation at Pier 5 and Pier 18 needs to be strengthened by adding each 12 piles and 16 piles surrounding the existing pile configuration so that the substructure can meet the safety criteria. The placement and construction method of new piles must consider the land availability, traffic management, and bridge clearance.

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Identification of T – pier construction work activities on the elevated railway project to develop work breakdown structure

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AIP Conference Proceedings 2023年第1期2877卷

作者： Pungky Dharma Saputra Luxpetrus Agustian Suhandi Nina Purwanti Muhammad Hamzah Fansuri Anasya Arsita Laksmi Military Building Construction Engineering Study Program Faculty of Military Engineering Indonesia Defense University Bogor Indonesia Civil Engineering Study Program School of Engineering & Technology Tanri Abeng University Jakarta Indonesia

The development of elevated railway infrastructures in Indonesia is going rapidly. The uniqueness of the T-Pier construction in the elevated railway project is the construction method that causes many activities to execute. The explained activities in the construction method were not clear, neither treated in much detail. In line with the problem, this research aim is to identify T-Piers construction work activities specifically. The project sample was MRT Jakarta CP 103 elevated section and T-Pier construction was the object of the case study. The first stage of this research was archive analysis, expert validation, and surveying of 100 bridge engineers. The collected data were analyzed by the descriptive analysis method. Then the work breakdown structure tree diagram was developed and shown the activities development. There were 31 activities identified starting from preparation until finishing and grouped into the main section group of activities i.e. pile cap, pier column, installation, and dismantling of temporary shoring, and pier head group activities. All the experts agreed that the activities identified were valid and almost all respondents 100% agree. The activities identified were at level 5 in the work breakdown structure development. The detailed activities can be standardized as a reference in future similar projects.

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