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6th Environmental Technology and Management Conference, ETMC 2019

作者： Aphirta, Sarah Soewondo, Prayatni Maisa Zakiyya, Nida Wulandari Putri, Dyah Setiani Muntalif, Barti Environmental Engineering Master Program Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia Program Study of Environmental Engineering Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia

Artificial support material was examined to determine the removal capacity of organic pollutants and nutrients on laboratory scale using PFR system. The experiment was performed using artificial water with similar characteristics to Cikapayang River in three PFRs of 10.78 L. The PFRs were made of PVC pipes filled with an inert chemical substrate as an artificial support material. The process of pollutants removal in the PFR relies on a biological layer (biofilm) grown on the surface of the material support. Three type of C:N:P ratio used in this study were 30:15:1, 75:25:2, and 180:35:3. The results showed that the maximum removal efficiency of TSS, TN, TP, and COD in the preliminary tests were 85%, 87%, 71% and 79%, respectively. Moreover, the maximum water absorption capacity result was up to 30.8%. Organic substrate removal rate compared with first order and Strover-Kincannon substrate removal models prediction. The best fit model for this experiment was Stover-Kincannon model, with the average correlation coefficient up to 90% for all of the three reactors. SEM analysis shown that the microorganisms shape is coccus with the average size of 5 μm. © 2020 The Authors, published by EDP Sciences.

关键词： Nutrients

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The Tamblang Dam break analysis using HEC-RAS 5.0.7 and PenRis hazard classification in Indonesia

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Arabian Journal of Geosciences 2023年第6期16卷 1-11页

作者： Yekti, Mawiti Infantri Adityananta, I Kade Edwin Baskara Pariartha, I Putu Gustave Suryantara Program Study Master of Civil Engineering Faculty of Engineering Udayana University Denpasar Indonesia

Tamblang Dam is one of the dams, north of Bali Island, with a capacity of 7.6 million m3, and the downstream areas are in the form of agricultural land, citizen settlements, schools, offices, and other public facilities for approximately 10 km2. Considering such a downstream and its large capacity, the Tamblang Dam would have a significant damage impact if it is a failure. Therefore, it is necessary to analyze the failure of the Tamblang Dam. The study aims to analyze the areas affected by floods due to the dam’s failures and to measure the damage risk. The failures were simulated using HEC-RAS 5.0.7 with four scenarios, such as overtopping, upper-piping, middle-piping, and bottom-piping. The simulation result showed that the Tamblang Dam’s failure with the overtopping scenario had the worst impact as it has the highest velocity and discharge compared to the other scenarios. The overtopping scenario inundated 355 ha areas along the river. Six villages would become the victims, namely, Bengkala, Bila, Menyali, Jagaraga, Bungkulan, and Kubutambahan. Tamblang Dam failures’ danger level was figured out in this research according to the PenRis Hazard Classification of Dams in Indonesia. For this case, it is found that 2527 residents are at immediate risk of flooding caused by the failures. Therefore, following the Danger Classification from the Public Work and Housing Guidelines of Indonesia, it can be stated that the Tamblang Dam is a 4-class dam with an extremely high danger status level.

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The Effect of EPS Addition to Soil Stabilized with Fly Ash as Lightweight Fill Materials for Embankment Construction 1

The Effect of EPS Addition to Soil Stabilized with Fly Ash a...

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2018 1st Workshop on engineering, Education, Applied Sciences, and Technology, WEAST 2018

作者： Syahril Somantri, Andri Krisnandi Febriansya, Aditia Civil Engineering Department Politeknik Negeri Bandung Bandung Indonesia Post-Graduate Stud. of Infrastructure Engineering Study Program Applied Master Program Politeknik Negeri Bandung Bandung Indonesia

Design and construction of road embankment presents several challenges, including the possibility of bearing capacity failure, large total settlement, differential settlement, and slope instability, which may result from the weight of the embankment construction itself, and/or weak foundation. A number of techniques have been developed and can be used to overcome these problems, one of them is by modifying the weight of the embankment itself with the use of lightweight materials, such as soil-EPS mixture. The use of soil-EPS mixture as lightweight material provides several advantages, among which can achieve the same volume or elevation requirement with a significantly lighter weight compared to ordinary materials, improving slope stability, embankment over high compressibility soil, and to reduce soil pressure to soil retaining structures, abutment or bridge pillar. Fly ash also added to act as binder to increase shear strength of mixture. The result of the compaction test shows that the addition of a small amount of EPS to the mixture can significantly reduce the maximum dry density of the mixture. Triaxial UU and UCS test results show a reduction in mixture strength as EPS contents increase, but due to the presence of fly ash increases the strength of mixture as the number of day increases, so that the use of lightweight materials has the potential to be one of soil improvement solutions. © Published under licence by IOP Publishing Ltd.

关键词： Mixtures

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Sadewa satellite remote sensing data to Manggarai 1-hour water level machine learning model 8

Sadewa satellite remote sensing data to Manggarai 1-hour wat...

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8th International Conference on Advanced Informatics: Concepts, Theory, and Application, ICAICTA 2021

作者： Valerian, Jonathan Raditya Rohmat, Faizal Kardhana, Hadi Kusuma, Muhammad Syahril Badri Yatsrib, Muhammad Institut Teknologi Bandung Master of Water Resources Management Faculty of Civil and Environmental Engineering Bandung Indonesia Institut Teknologi Bandung Water Resources Research Group Faculty of Civil and Environmental Engineering Bandung Indonesia Institut Teknologi Bandung Water Resources Engineering and Management Study Program Faculty of Civil and Environmental Engineering Bandung Indonesia

ISBN: (纸本)9781665417433

The Manggarai Water Gate is a measurement point strategically located to measure Jakarta's flooding magnitude that keeps increasing from year to year. The 2015s gate capacity improvement underscores this importance. This paper applies a machine learning model that utilizes an atmospheric approach to predict the Manggarai water level as output. In the process, optimization is done by comparing three spatial input sizes and performing a sensitivity analysis of the input variables. Using a simple recurrent sequence, the model can predict the water level with a coefficient of determination (R2) reaching 0.7 using 18-hour recurrent data. This study can be used as the basis for further development that can take satellite data lead time advantage that is crucial for the early warning system. © 2021 IEEE.

关键词： Water levels

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Measurement analysis of the level of household preparedness for facing landslide in Bogor regency 2

Measurement analysis of the level of household preparedness ...

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2nd International Conference on Disaster and Management 2020, ICDM 2020

作者： Saputra, P.D. Rahmawati, C. Purnomo, K.S.H. Larosa, E. Nurhasanah Military Building Construction Engineering Study Program Faculty of Military Engineering Indonesia Defense University Bogor Indonesia Industrial Engineering Department Faculty of Industrial Technology Universitas Dirgantara Marsekal Suryadarma Jakarta Indonesia Master of Management Program Universitas Teknologi Yogyakarta Yogyakarta Indonesia Mechanical Engineering Education Faculty of Teacher Training and Education Universitas Negeri Yogyakarta Yogyakarta Indonesia Civil Engineering Study Program School of Engineering and Technology Tanri Abeng University Jakarta Indonesia

There are so many areas in Indonesia that are prone to landslides. Bogor is the regency with the most frequent landslides. Therefore, high community preparedness is needed to deal with the landslide, especially at the household level because it is the spearhead of preparedness and influence disaster risk. The objective of this research is to measure and analyze the level of household preparedness for facing landslide. The location of this research is in Cibadak Village, Bogor regency where a landslide disaster had happened. This is a quantitative research. The number of the samples were 100 household. Data collection was done by surveying samples and distributing questionnaires. The data would be analyzed with descriptive analysis, and the results of level of household preparedness would be categorized to five levels which were very prepared (80-100), prepared (65-79), almost prepared (55-64), less prepared (40-54), and not prepared (0-39). The results of the research are the average index value of Knowledge and Attitude (KA) parameter is 66.77, Emergency Planning (EP) parameter is 52.24, Warning System (WS) parameter is 64.80, Resources Mobilization Capacity (RMC) parameter is 51.25 and the level of household preparedness for facing landslide is 59.26 or and it is significant at the almost prepared level. © Published under licence by IOP Publishing Ltd.

关键词： Landslides

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Relationship between drought and soil erosion based on the normalized differential water index(NDWI)and revised universal soil loss equation(RUSLE)model

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Regional Sustainability 2024年第4期5卷 133-144页

作者： Muhammad RENDANA Wan Mohd Razi IDRIS Febrinasti ALIA Supli Effendi RAHIM Muhammad YAMIN Muhammad IZZUDIN Department of Chemical Engineering Faculty of EngineeringUniversitas SriwijayaIndralaya30662Indonesia Master Program of Environmental Management Graduate SchoolUniversitas SriwijayaPalembang30139Indonesia Department of Earth Sciences and Environment Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaBangi43600Malaysia Department of Civil Engineering Faculty of EngineeringUniversitas SriwijayaIndralaya30662Indonesia Master Program of Agricultural Sciences Graduate Study ProgramUniversitas Muhammadiyah PalembangPalembang30263Indonesia Department of Agribusiness Faculty of AgricultureUniversitas SriwijayaIndralaya30662Indonesia Department of Sociology Faculty of Social and Political SciencesUniversitas SriwijayaIndralaya30662Indonesia

The Langat River Basin in Malaysia is vulnerable to soil erosion risks because of its exposure to intensive land use activities and its topography,which primarily consists of steep slopes and mountainous ***,climate change frequently exposes this basin to drought,which negatively affects soil and water ***,recent studies have rarely shown how soil reacts to drought,such as soil ***,the purpose of this study is to evaluate the relationship between drought and soil erosion in the Langat River *** analyzed drought indices using Landsat 8 satellite images in November 2021,and created the normalized differential water index(NDWI)via Landsat 8 data to produce a drought *** used the revised universal soil loss equation(RUSLE)model to predict soil *** verified an association between the NDWI and soil erosion data using a correlation *** results revealed that the southern and northern regions of the study area experienced drought *** predicted an average annual soil erosion of approximately 58.11 t/(hm^(2)·a).Analysis of the association between the NDWI and soil erosion revealed a strong positive correlation,with a Pearson correlation coefficient of *** assumed that the slope length and steepness factor was the primary contributor to soil erosion in the study *** a result,these findings can help authorities plan effective measures to reduce the impacts of drought and soil erosion in the future.

关键词： Drought Soil erosion Normalized differential water index(NDWI) Revised universal soil loss equation(RUSLE) Langat River Basin

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Mode choice analysis of passenger transport at train station using stated preference method

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AIP Conference Proceedings 2024年第1期2838卷

作者： Nurul Hidayati Nadiah Mufidah Sri Sunarjono Munajat Tri Nugroho Helmi Dhia Al Ghalib Civil Engineering Master Study Program Universitas Muhammadiyah Surakarta Surakarta Indonesia Civil Engineering Study Program Universitas Muhammadiyah Surakarta Surakarta Indonesia

Tourists at Solo Balapan Station have several options for continuing their journey, including private, semi-private, and public vehicles. Despite the fact that Batik Solo Trans (BST) Corridor II is one of the modes of public transportation available at this location, it is still infrequently used. The goal of this research is to identify the factors that influence mode selection and to develop a model. This study employs statistical analysis to investigate passengers’ socioeconomic and travel characteristics, as well as methods for expressing preferences regarding ticket attributes, headway, and service level. Questionnaires were distributed at nearby stations and bus stops to collect data from 240 respondents. The binomial logit model was used to analyze the mode selection model. According to the stated preference method, respondents believe that the IDR 3500 fare, 10 minutes of headway, and Wi-Fi will persuade passengers to choose BST. Private-Online, Private-BST, and Online-BST are other binary logit models. If the costs of private vehicles and online transportation are the same, 52% of respondents will choose private vehicles, according to the results of the binary-difference logit modeling. Similarly, if the costs of BST and private vehicles are comparable, 70% of respondents will choose private vehicles. If the BST and online transportation costs are the same, however, 38 percent will choose online transportation. The logit-ratio modeling results also show the previously mentioned conditions. If the cost ratio is one, the three alternatives listed above are obtained in the following order: 52% prefer private vehicles in Alternative 1, 63% prefer BST in Alternative 2, and the same percentage prefer online transportation in Alternative 3. The results of preference analysis show that if the value of the BST attribute is changed, the percentage of passengers who choose BST increases.

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Analysis of Project Cost Management Indicators at Residential Buildings (Case study: Building Construction Project in Rusun Penggilingan Jakarta)

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IOP Conference Series: Materials Science and engineering 2019年第1期508卷

作者： A.S Manlian Ronald Hendra Lumbantoruan Master of Civil Engineering majoring in Construction Management - Universitas Pelita Harapan Master of Civil Engineering Study Program Construction Management – Universitas Tarumanagara.

Indonesia's economic growth is growing along with the growth of the construction industry against increasing construction projects. The performance of a construction project requires serious management to achieve maximum results. Delays occur, quality is not in accordance with contract specifications, and costs that sometimes occur overbudget. Some studies show that the dominant factors causing overbudget in construction projects consist of: cost estimation factors, performance management factors, resource mobilization factors, control factors of timing performance, incomplete project information data, increasing material prices, and financial policies from government. In overcoming these dominant factors, project cost management is needed. Construction projects can be managed with project cost management. Project cost management includes the stages of planning, scheduling and controlling which are important steps to be taken to achieve the objective of project performance. Project cost management involves cost budgeting and cost control. Cost budgeting aims to generate a cost baseline to ensure project performance and project needs. A cost baseline is a time step from the budget used by the project manager to ensure and monitor costs. Cost control is used to monitor costs based on the cost baseline. Project control systems can be seen through project performance. Project performance can be done by comparing cost performance over time. Costs from the time period can be analyzed by variance analysis. Variance analysis involves actual project performance with planned performance. Value technique is used to analyze trend whether a performance is improving or deteriorating by comparing planned performance with actual performance. EVA (earned value analysis) is one of method using for project control. EVA method can be used to measure project performance which applied as a tool to integrate between cost and time aspect.

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The comparison of road network performance before and after the implementation of one-way system using prediction model

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AIP Conference Proceedings 2024年第1期2838卷

作者： Alfia Magfirona Nurul Hidayati Ari Wibowo Sri Sunarjono Budi Yulianto Civil Engineering Study Program Engineering Faculty Universitas Muhammadiyah Surakarta Indonesia Civil Engineering Master Study Program Engineering Faculty Universitas Muhammadiyah Surakarta Indonesia Transportation Agency of Surakarta Indonesia Dinas Perhubungan Surakarta Indonesia

One-way traffic networks maybe force drivers to bypass blockages to reach their destinations, potentially increasing trip distances. However, it is beneficial for anticipating some traffic problems in most urban traffic conditions—only a few studies concerned the regression approach for predicting road network performance models. As a result, this research aims to use the regression method to forecast the performance model of the road network before and after one-way traffic system implementation. The derived model equations are compared to see which ones substantially impact the road network’s performance. This study relies on secondary data from performance assessments of 26 roads before and after the system during morning peak hours of 06:30–07:30 AM. The independent variables (X) are data from segment analysis used, i.e., Volume (X1), Speed (X2), and Volume (X4), whereas the dependent variable (Y) is Level of Service. By attempting the model prediction multivariate linear regression modeling before the system, Y = 5.647 – 4.376X1+0.009X2+0.0003X4 tend better than others. It provided a more significant impact on LOS than other models provided by R-value 0.951 is higher than the other models. The R-square value is 0.904, which means that 90.4% of LOS is influenced by DS, V, and Q factors. Further research is needed to conduct in the form of additional other factors that can affect LOS.

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An analysis of the damage level and reconstruction priority of elementary school buildings in the Central Lombok District

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AIP Conference Proceedings 2023年第1期2706卷

作者： Hariyadi Saifullah Akmaluddin Department of Civil Engineering Faculty of Engineering University of Mataram 83115 Indonesia Master Student of Civil Engineering Study Program Faculty of Engineering University of Mataram 83115 Indonesia

In Central Lombok District, the allocation of funds for the rehabilitation of elementary schools is very small compared to the number of schools that need reconstruction. The percentage of classroom rehabilitation work based on the target schools only reached 9.96%. Consequently, it needs to study to analyze the damage level of buildings and find out the most influenced criteria in formulating decisions for selecting school priorities that must be rehabilitated. Due to controlled aspects and standards are quite a lot and more sophisticated, accordingly the Analytical Hierarchy Process (AHP) method is the proper method for solving these complex problems. The sample in this study was 13 of the 25 schools that received special funds in 2018. The application of the AHP method was preceded by a survey involving experts who were competent in their fields. The results showed that the number of schools with moderate damage was six and severely damaged as many as seven schools. At the same time, based on the order of priority, building repairs are determined by the most influential criteria, namely the level of damage and primary education data.

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