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Journal of the Civil Engineering Forum

jcef
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Published by Universitas Gadjah Mada

ISSN : 25811037 EISSN : 25495925 DOI : -

Core Subject : Social, Engineering,

Civil Engineering, Building, Construction & Architecture Environmental Science

Journal of the Civil Engineering Forum (JCEF) is a four-monthly journal on Civil Engineering and Environmental related sciences. The journal was established in 1992 as Forum Teknik Sipil, a six-monthly journal published in Bahasa Indonesia, where the first publication was issued as Volume I/1 - January 1992 under the name of Forum Teknik Sipil.

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Articles 225 Documents

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Study of Lusi River Flood Discharge in Central Java Province Pontjo Witjaksono Arief Rachmanto
Journal of the Civil Engineering Forum VOLUME: XXII/2 - MAY 2013
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.18909

Lusi is one of the big rivers of Serang Lusi Juana (Seluna) River System that contributes to flood event on the downstream part of the system. To cope with the flood problem occurred in Seluna River System. Kedungombo Dam has been constructed on the upstream part of Serang River. However, flood flow from Lusi River, which covers 2.100 km2 of catchment area, cannot be controlled.By calculating the Lusi River design flood discharge, the flood discharge contribution of Lusi River to the Seluna River System can be predicted. Design flood hydrograph of Lusi River is determined using the synthetic unit hydrograph approach due to inadequate data. The synthetic unit hydrograph of Gama I is used in this study. To distribute design daily rainfall into hourly rainfall units to be applied in flood hydrograph calculation, hypothetic rainfall distribution is used by employing the Alternating Block Method (ABM) and Tadashi Tanimoto methods for several floods returning period.Design flood discharge applied for the calculation is the results of the ABM Rainfall distribution based on the two-daily rainfall data. The results of design flood discharge under this method show 748m3/s for return period of 2 years, 1036m3/s for return period of 50 years, 1097 m3/s for return period of 100 years and 1158 m3/s for return period of 200 years. 96% of Lusi River design flood gives contribution to the Seluna River System which is approximately 1200m3/s gained from Q200 design flood discharge in Klambu barrageKey Words: Flood discharge, synthetic unit hydrograph, hypothetical rainfall distribution, design discharge.

EFFECT OF SAND MINING ACTIVITY ON THE SEDIMENT CONTROL SYSTEM (A CASE STUDY OF SOMBE-LEWARA RIVER, DONGGALA, INDONESIA) Y. A. Bawias
Journal of the Civil Engineering Forum Volume: XXI/1 - January 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Sombe-Lewara River is a tributary of Palu River which lies at the most downstream part of Palu River which has 112.38 Km2 of catchment area and 28.11 Km of river length. Sombe-Lewara River comprises three reaches, i.e. Sombe River, Lewara River, and Sombe-Lewara River. In order to control the debris flow disaster, six sediment control structures have been built in Sombe River and another two were built in Lewara River. The sand mining activity in Sombe-Lewara River has caused river degradation and to some extent damaged sediment control structures. In order to prevent the river from further degradation and decrease in environment condition, a proper sediment management is therefore considered necessary. This paper illustrates the sediment balance analysis which applies the empirical formula of sediment supply at the upstream of sediment control structure and storage characteristics of sediment control structures, the initiation of debris flow occurrence and the sediment volume controlled by sediment control structures. The sediment balance was studied based on the sediment flow within the period of 2000 through 2009, at the existing infrastructures and the further development of sediment control structures. The results show that at 10 mm rainfall depth over the catchment, the average annual sediment supply at Somber River and Lewara River was found to be approximately 240,195 m3 and 112,500 m3 respectively. Within the above period, the sediment volume passing through control point 1 was approximately 105,890 m3. Furthermore, the sand mining activity at Sombe-Lewara River has caused severe river degradation and damage on the existing sediment control structures. Keywords: Sediment balance, sediment control structures, sand mining.

Response of Fuel Subsidy Removal as Sustainable Transport Policy (Case Study: Workers in Jakarta Metropolitan Area) Octaviani Ariyanti; Samuel Petros Sebhatu
Journal of the Civil Engineering Forum Vol. 2 No. 2 (May 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Motorization in urban areas contributes several problems such as congestion, accidents, gas emissions, noises, and infrastructure breakage. Meanwhile, most of the developing countries cannot overcome such growth activities, as well as in Jakarta. By December 2013, Vice Governor of Jakarta proposes fuel subsidy removal policy as one of sustainable transport policy. This study is intended to understand and investigate how fuel subsidy removal policy scenarios (25%, 50%, and 100%) in Jakarta affects travelers’ behavior and analyze such policy to support sustainable transport by using qualitative research methodology. Interviews and questionnaires survey is conducted to workers in Jakarta, which includes ranking scale question for traveler response options. The result shows that half of the respondents are not affected and will only respond to fuel price increasing at IDR 31,400 for gasoline price and IDR 26,300 for ADO (Auto Diesel Oil). Moreover, there is a tendency of respondent's to the response by changing their travel mode choices into more fuel efficient private vehicle.

THE EFFICACY OF MOTORCYCLE TRAINING TO REDUCE SELF-REPORTED NEGATIVE BEHAVIOUR AND ATTITUDE (CASE STUDY IN UK AND INDONESIA) Winna Justiana Sirait; Sigit Priyanto; Samantha Jamson
Journal of the Civil Engineering Forum VOLUME: XXIII/1 - JANUARY 2014
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Motorcyclists are vulnerable road users because of their particular combination of physical vulnerability. Motorcyclists’ training and licensing system have already implemented in so many countries in the world particularly developed countries. In the other hand, there are countries, particularly developing countries, where motorcyclists are less regulated in term of licensing, enforcement, and insurance. Therefore the objective of this research are to analyses the behavior and attitude of motorcyclists in Yorkshire and Humber Region (UK) and Jakarta (Indonesia), and to analyses the efficacy of motorcycle training in UK to influence the self-reported negative behavior and attitude of motorcyclists.Motorcycle Rider Behavior Questionnaire (MRBQ) and Motorcyclists Attitude Questionnaire (MAQ) are used to conduct this study. The Mann Whitney test is used to evaluate the significance different of the mean score, which obtained from the survey in each country (UK and Indonesia).Mean score computation showed that Yorkshire and Humber Region’s respondents have better mean score than Jakarta’s respondents. However Mann Whitney test showed that the mean score different is not significant for speed violation factor in MRBQ and drink driving and speeding factor in MAQ.Keywords: motorcyclist, motorcycle training, Motorcycle Rider Behavior Questionnaire (MRBQ), Motorcyclist Attitude Questionnaire (MAQ).

MODELLING AND ANALYSIS OF THE BUS PRIORITY IMPLEMENTATION Lydia Hidayati
Journal of the Civil Engineering Forum Volume: XXI/2 - May 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Bus is expected to play an important role in providing a reliable travel in congested conditions. Therefore, it has been widely studied to minimize the travel time and the delay of the bus by proposing bus priority scheme to increase the attractiveness of public transport against private vehicles. Signal timing optimization combined with the bus priority scheme are discussed in this research as the alternatives to improve the intersection performances. Further, identifying the effects of these alternatives towards the general vehicles and public transport system performances were the aims of this research as well. As the result of this research, bus advance area with pre-signal method is able to reduce the travel time and delay of the bus for routes 2A and 3A by 11%, 23% and 14% , 0% respectively and able to reduce travel time, delay, and queue of vehicles by 25%, 26%, 7% consecutively. Thus bus advance area with pre-signal method is proposed as the best alternative due to its impact to reduce the bus travel times and delay without degrading the other vehicles performance. Keywords: bus priority, optimizing signal timing, Aimsun simulation, travel time-delay-queue.

Development of Relocation Strategies Regarding Eruption Hazard in Mount Merapi Rosdiana Puji Lestari
Journal of the Civil Engineering Forum Vol. 1 No. 3 (September 2015)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

The research was conducted to answer a questions: 1) how the relocation of the current strategy was carried out by the government 2) the problems that arise in the relocation which has yet to be resolved, 3) how the good concept of relocation so that these problems can be minimized. The research methodology used in this study combined quantitative and qualitative methods. Qualitative methods are used to explain the empirical facts that exist in each of these conditions in the relocation settlements. SWOT analysis is used to provide an overview of the strengths, weaknesses, opportunities and threats in the relocation of victims of Merapi. Information, facts and issues that arise in the study will be described, explained and analyzed primarily for the impact of residential relocation on social and economic life of the community. Relocation concept of the economic aspects of community empowerment efforts should be made related to community economic recovery after a change in livelihood. In addition, the potential of community mapping needs to be done by the government to be optimized and developed. From the aspect of government settlements seek to transfer ownership of land in the new settlement which may be the property of the citizens so that citizens obtain legal certainty while occupying the new settlement. The social aspects of the development potential of relocating residents and making it as a tourist village, residents need to support that relocation is no longer a newcomer, they have the same rights and obligations with citizens of another.

Comparative Study on Implementing Home Air Conditioning for Passenger Carriages in the Indonesian Railway Hardianto Eko Prasetio; Siti Malkhamah; Charles Watson; Subarmono Subarmono
Journal of the Civil Engineering Forum Vol. 3 No. 3 (September 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Passenger comfort is important in railway transport system. The train operator company in Indonesia would like to increase passenger comfort by installing home air conditioning into all existing carriages of the economy train. The air conditioning is expected to give better passenger convince. Therefore, the aims of this research are to know the cooling load and compare characteristic between home Air Conditioning (AC) and train AC. The cooling load calculation is analyzed using Cooling Load Temperature Difference (CLTD)/Solar Cooling Load (SCL)/Cooling Load Factor (CLF) method. Comparison between both home air conditioning and train air conditioning are discussed to identify the benefits and drawbacks of each type. The total heat that needs to be removed from a passenger carriage with home AC is 104,334 Btu/h, while the total cooling capacity of home AC is 75,000 Btu/h. The passenger carriages with train AC have cooling capacity 119,100 Btu/h to remove heat 11,5290 Btu/h. The Energy Efficiency Ratio (EER) value of most home AC is higher than train AC, installation time of home AC is shorter than train AC, total cost for 20 years period of home AC is more than train AC. There is no guarantee for home AC, so everything that happens to it will become the full responsibility of train operator company. The train AC control system is more effective than the home AC. No fresh air is permitted to circulate within the home AC system hence, the same air is repeatedly processed in the system. Implementing home air conditioning in the existing passenger carriages is worthwhile for short time period in the goal to increase and improve the level of service provided by giving better comfortability to the passenger.

THE BOGOR BUS STATION RELOCATION IMPACT ANALYSIS TO THE BOGOR OUTER RING ROAD (BORR) AND PANGERAN SOGIRI STREET PERFORMANCE Tri Sudibyo; Imam Muthohar
Journal of the Civil Engineering Forum Volume: XXI/3 - September 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

As the main bus station in Bogor, West Java, Baranangsiang bus station is currently located in the crowded city centre, near many offices, campuses and department stores. There is a plan of Bogor’s Dinas Perhubungan Komunikasi dan Informasi (Diskominfo) to relocate the bus station to the new location in the Pangeran Sogiri Street in Tanah Baru area, near the newly built toll road, the Bogor Outer Ring Road (BORR).This research is conducted to analyze the traffic performance impact of the relocation plan of the bus station to the BORR network and the Pangeran Sogiri Street. The traffic data is obtained from the field survey in the Baranangsiang bus station and the BORR network. Some other secondary data are obtained from the Dinas Lalu Lintas and Angkutan Jalan (DLLAJ) Bogor city. Based on the obtained data, a micro simulation model is built by using Aimsun traffic micro simulation program. The analysis is conducted in three traffic performance parameters; the traffic density, speed, and vehicles queue length. With respect to the analysis result, the relocation causes a serious traffic problem to the BORR network and the P. Sogiri Street. To minimize the problem caused by the relocation, three scenarios are proposed and thus simulated based on the findings and observed traffic problems. The first proposed scenario is conducted by widening the P. Sogiri Street and providing a 4-4 toll payment gate system to the BORR. This first scenario is able to reduce traffic problem in some sections, but the average network density, speed and queue length are still high by 132%, -54%, and 200% respectively compared to the existing condition. The second scenario is conducted by widening the P. Sogiri Street and providing a 5-3 toll gate system. This second scenario is also able to reduce traffic problem in most sections, but the average network density, speed and queue length are still high by 248%, -70%, and 95% respectively compared to the main bus station before the relocation. The third scenario is conducted by widening the P. Sogiri into 4 lanes, providing a 4-3 toll gate system, and providing a new access from/to P. Sogiri Street to Bogor city direction. The simulation result shows that the third scenario is considered as the best scenario since in this scenario, the density, speed and queue length are relatively similar compared to the existing condition.

SNAKE LINE ANALYSIS FOR LAHAR FLOW WARNING SYSTEM (CASE STUDY IN PUTIH RIVER, MOUNT MERAPI) Nina Yulinsa
Journal of the Civil Engineering Forum Vol. 1 No. 1 (January 2015)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Lahar flow in the region of Mount Merapi after an eruption of 2010 is still considered potentially to happen and threat the region along the river from the upstream. The development of warning criteria against the potential occurrence of lahar flow is a thing that should be done continuously to accommodate dynamics data availability (rainfall data and lahar flow occurrence data), although with limited data. This study aims to develop lahar warning system applying snake line as a rain phenomenon in Putih catchment area which will affect the occurrence of lahar flow and to evaluate the success rate of snake line for deciding the warning system. This study used the main reference from Guidelines for Development of Warning and Evacuation System against Sediment Disasters in Developing Countries released by Ministry of Land, Infrastructure and Transport Infrastructure Development Institute – Japan (2004). This research was conducted through several stages, i.e. secondary data collection in the form of rainfall data, lahar flow occurrence data, making correlation graph between rainfall intensity and working rainfall, determination of critical line, warning line and evacuation line. The results show that standard rainfall for warning and evacuation alert in Putih River are 22 mm, and 49 mm, respectively. The accuracy of warning criteria and the evacuation criteria against snake line for warning line is 30%, evacuation line is 61% and the critical line is 83%. The behavior of snake line that indicates lahar flow occurrence in Putih River forming an angle of 40o up to 45o.

Econometric Forecasting Models for Air Traffic Passenger of Indonesia Viktor Suryan
Journal of the Civil Engineering Forum Vol. 3 No. 1 (January 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

One of the major benefits of the air transport services operating in bigger countries is the fact that they provide a vital social economic linkage. This study is an attempt to establish the determinants of the passenger air traffic in Indonesia. The main objective of the study is to determine the economic variables that affect the number of airline passengers using the econometrics model of projection with an emphasis on the use of panel data and to determine the economic variables that affect the number of airline passengers using the econometrics model of projection with an emphasis on the use of time series data. This research also predicts the upcoming number of air traffic passenger until 2030. Air transportation and the economic activity in a country are interdependent. This work first uses the data at the country level and then at the selected airport level for review. The methodology used in this study has adopted the study for both normal regression and panel data regression techniques. Once all these steps are performed, the final equation is taken up for the forecast of the passenger inflow data in the Indonesian airports. To forecast the same, the forecasted numbers of the GDP (Gross Domestic Product) and population (independent variables were chosen as a part of the literature review exercise) are used. The result of this study shows the GDP per capita have significant related to a number of passengers which the elasticity 2.23 (time-series data) and 1.889 for panel data. The exchange rate variable is unrelated to a number of passengers as shown in the value of elasticity. In addition, the total of population gives small value for the elasticity. Moreover, the number of passengers is also affected by the dummy variable (deregulation). With three scenarios: low, medium and high for GDP per capita, the percentage of growth for total number of air traffic passenger from the year 2015 to 2030 is 199.3%, 205.7%, and 320.9% respectively.

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