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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.

Arjuna Subject : -

Articles 225 Documents

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THERMAL INSULATION EFFECTS ON ENERGY EFFICIENCY OF BUILDING STRUCTURES M. Cvetkovska; M. Knezevic; M. Rogac
Journal of the Civil Engineering Forum Volume: XXI/2 - May 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

This paper presents the use of Finite Element Method for heat transfer analysis. Connections wall-beam-floor structures with different positions of the thermal insulation have been analyzed and conclusions about energy efficiency and energy loss are made. Keywords: heat transfer, numerical analysis, finite elements, thermal insulation, energy efficiency.

Analysis of Service Quality on Building Loyalty by Using Structural Equation Modelling Method (Case Study in Majapahit Railways) Eka Arista Anggorowati
Journal of the Civil Engineering Forum Vol. 1 No. 2 (May 2015)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Train system is one of the transportation modes with some special characteristics that make it becomes an effective and efficient transportation system to increase the service quality. Although the AC economy class of Majapahit Railway has been officially opened by the government, it has not been able to fulfill the people’s need. It is proved with the decrease of number of passenger, and the increase of critics related to the service quality. This research aims to analyze the principal elements and the effect of service qualities towards the customer’s loyalty. The research was conducted through survey on the Majapahit railway users consisting of 200 respondents. The used sampling technique was non probability sampling with purposive sampling method. It applied Structural Equation Modelling in which the previous test was the classical assumptions. Based on the calculations, it is indicated that the variables of service quality in customer satisfaction and loyalty is significant. The principal elements that influence satisfaction and loyalty are the operational schedule, the rolling stock condition, station’s comfort and security, safety, ticket price, and how the passengers enjoy the travelling. Adjusted R square of 0.8246 shows that 82 percent of consumer’ loyalty can give impact on service quality and customer satisfaction.

Dependable Flow and Flood Control Performance of Logung Dam, Central Java Province, Indonesia Faza Ramadhani
Journal of the Civil Engineering Forum Vol. 3 No. 2 (May 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

The change of land use in Mt. Muria area Central Java has been resulting in the significant sheet erosion of upstream watershed around Mt. Muria, followed by considerably high sedimentation on rivers downstream that lead to the reduction of cross sections of the rivers including Logung River. Such situation has been contributing the condition that downstream of Logung River is very potential to experience over flow and inundation to its surrounding area. An idea of constructing the Logung Dam was introduced in 1986 that aimed at reducing the aforementioned inundation. Besides, the development of Logung Dam was also aimed at fulfilling both irrigation and non-irrigation water demand. This paper presents the results of the analysis of the water availability and flood control performance of the Logung Dam. The dependable flow was analyzed by applying the National Rural Electric Cooperative Association (NRECA) method in order to determine the low flow characteristics, whereas the identification of the high flow characteristics was carried out by using the Synthetic Unit Hydrograph (SUH) methods, i.e., the GAMA I and Nakayasu modeling approach. At a certain reservoir characteristic and a defined geometry of spillway, several reservoir routing simulations were carried out on both dependable flows and high flows. Results of the reservoir routing showed the promising water availability of the Logung Dam to fulfill water demand for both irrigation and non-irrigation, whereas the reservoir routing could reduce the probable maximum flood from QPMF from 1,031 m3/s to approximately 950 m3/s or damping efficiency at 7.86%. Further analysis suggests necessary operation and maintenance of Logung Dam to sustain its function and to mitigate possible problems related to reservoir sedimentation.

INTEGRATED TICKETING SYSTEM OF PUBLIC TRANSPORT IN JAKARTA VS VÄRMLAND, SWEDEN Teguh Himawan Ronggosusanto
Journal of the Civil Engineering Forum VOLUME: XXII/1 - January 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.18917

The heightened mobility of people in the DKI Jakarta province and surrounding area requires balance of the development public transport services. One of service attributes in public transportation is ticketing system. Currently, the ticketing system in Jakarta needs to be improved and still not integrated. Therefore, the importance to develop and implement a new integrated ticketing system to increase the competitiveness and attractiveness of public transports. It also gives an opportunity to the operators in order to implement several of ticket prices. There are some of barriers that faced by operators in development a new integrated ticketing system such as; institutional issue, resources integration, and financial problems. In order to describe and analyze the development of a new integrated ticketing system, this thesis uses a qualitative research approach and five sources of evidence i.e. documentation, archival records, an interview, direct and participant observations through a survey using the form of questionnaires that distributed to the public transport users. Further, this study also uses the case of Värmlandstrafik AB as the comparative study and the theoretical basis of the new services development as an approach to assess the possibility of implement a new integrated ticketing system. It aims to investigate the ticketing system phenomenon using information and data observations as materials to analyze, explore, and provide depth explanation. By analyzing data from a survey of passengers, this study gave a description and explanation related the characteristic and the travel behavior of passenger, also an assessment of ticketing system that underlies the development a new integrated ticketing system. Then, using the comparative case study of Värmlandstrafik AB that already implement an integrated ticketing system and the self-services in provision of public transport services gave an analysis what needs to prepare for implement a new integrated ticketing system consider to the organizational process.

STABILITY OF UNDERWATER STRUCTURE UNDER WAVE ATTACK C. Paotonan; D. B.P. Allo
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Geotube is, among others, a type of coastal structure that is increasingly accepted for coastal protection especially underwater breakwater. Besides its relatively low cost, it has other advantages such as flexibility, ease of construction and the fact that it can be filled with local sand material. Similar to all other coastal structures, it should also be stable under wave attack. A simple theoretical approach based on linear wave was adopted to estimate the stability of such structure. The theoretical solution was then compared with an experimental study. The experimental study was conducted at the Hydraulics and Hydrology Laboratory of Universitas Gadjah Mada. However, instead of a real geotube, PVC pipe was used where the weight of the PVC was varied by adjusting the volume of sand in the pipe. The result indicated that the agreement between the theoretical solution and the experiment was encouraging. The analytical solution may be utilized to predict underwater pipe stability under wave attack with certain degree of accuracy.

Development of Alternatives to Mitigate Deterioration of Segara Anakan Lagoon as Revealed by Analytical Hierarchy Process Harnita Rosalina
Journal of the Civil Engineering Forum Vol. 2 No. 3 (September 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Segara Anakan is a lagoon located in estuary area of Citanduy and Cibeureum rivers. The main problem that exists in the region Segara Anakan is a shrinking area of Segara Anakan lead lagoon function becomes ineffective due to the increased volume of sediment in estuaries Citanduy. Refinement Segara Anakan will impact annual floods that occurred in the area downstream Citanduy. Have far-reaching is the decline in fish production, which makes the source of livelihood for the community residents of Kampung Laut, furthermore, the environmental changes that occurred in the area Segara Anakan have resulted in shrinking coastal fisheries resources and the expansion of land arising from silting. Assessment of the problem conducted by the method of approach of Analytical Hierarchy Process(AHP) to obtain the best alternatives among three alternatives being offered to sustain the function of Segara Anakan Lagoon. These three alternatives include the 1) Dredging the Lagoon and Upstream Watershed Conservation; 2) Dredging the Lagoon and Reclamation Work around Segara Anakan, and 3) Dredging the Lagoon and Citanduy Diversion. Some criteria and sub-criteria are adapted to support the selection of the alternatives and related questionnaires were developed, and the questionnaire filling was carried out through the implementation of Focus Group of Discussion or FGD. The criteria include several aspects of the criteria and sub-criteria are technical (floods, silting), socioeconomic (the tourist area, the local economy), as well as the environment (fisheries/shipping, agriculture and mangrove forests). Results of the analysis applying the AHP method showed the consistent value on the Alternative 3), i.e. the Dredging of the Lagoon and the Upstream Watershed Conservation (38%).

Analysis of Hydraulic Flood Control Structure at Putat Boro River Ruhban Ruzziyatno
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.18908

Putat Boro River is one of the main drainage systems of Surakarta city which drains into Bengawan Solo river. The primary problem when flood occur is the higher water level of Bengawan Solo than Boro River and then backwater occur and inundates Putat Boro River. The objective of the study is to obtain operational method of Putat Boro River floodgate to control both inflows and outflows not only during flood but also normal condition. It also aims to know the Putat Boro rivers floodgate operational function to reduce inundation. Putat Boro river water level variation and Bengawan Solo river water level variation were used for simulation of Boro river floodgate routing. The simulation used 10-year inflows, 50-year inflows, and 100-year inflows return period and Boro water level variation are +82.50 m, +83.00 m and +84.00 m. The results of the study show that the effective opening of floodgate are 0.35 m - 0.55 m for +82.05 m of Bengawan Solo water level, 0.50 m – 0.65 m for +82.55 m of Bengawan Solo water level and 0.70 m – 0.85 m for +83.48 m of Bengawan Solo water level, for reducing water level of Boro river flooding. Keywords: Flood, drainage systems, floodgate and flow routing.

EROSION RATE OF RESERVOIR DEPOSIT AS REVEALED BY LABORATORY EXPERIMENT A. S. Amar
Journal of the Civil Engineering Forum Volume: XXI/1 - January 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

The construction of dams and reservoirs in a river can give significant impacts on its flow of water and sediment, and can cause long-term morphological changes on the river. Reservoir sedimentation can reduce a reservoir’s effective flood control volume, and in some severe cases can cause overtopping during floods. Sediment deposition against a dam can reduce its stability, and affect the operation of low-level outlet works, gates, and valves. The abrasive action of sediment particles can roughen the surface of release facilities and can cause cavitations and vibration. Sedimentation can also affect a reservoir’s water quality, and reduce its flood control, water supply, hydropower, and recreation benefits. Consequently, taking sedimentation into consideration not only in the planning and design, but also in the operation and maintenance of a dam and reservoir is important. Keywords: Erosion rate, reservoir deposit, shear stress.

Meteorological Drought Assessment in Wonogiri District Karlina Karlina
Journal of the Civil Engineering Forum Vol. 2 No. 2 (May 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Drought is one of natural disaster occurrences that affect many life aspects such as agricultural and economy. Drought is one of hazard that affected by extreme condition due to climate change. Wonogiri is one of districts in Indonesia that has a high risk of meteorological drought. This area tends to have less rainfall than other areas that make the condition drier. This study is aimed to provide some information required in determining the drought disaster mitigation through analysis of the drought characteristics, for both historical and future condition. For the historical condition analysis, the input is 12 years of daily rainfall recorded data from 1990 to 2001 in 15 rain gauges. In case of the future assessment, the meteorological drought was analyzed by using Effective Drought Index (EDI) and Standardized Precipitation Index (SPI) methods. Input data for the future assessment is 90 years of daily rainfall which was generated by using climate model HadCM3 scenario A2 and B2. The future data prediction was done by using Automated Statistical Downscaling software. Statistical criteria i.e. Root Mean Square Error (RMSE), regression coefficient and standard deviation were used for testing the model accuracy. The drought coefficient obtained from the analysis using EDI and SPI then was applied to draw drought risk map using GIS software in Wonogiri District for historical and future condition. The results show that for the historical condition, the most severe drought occurred in 1997-1998. This extreme condition related to ENSO phenomenon that happened in this area. Compared with the historical condition, the number of future drought event in 2080 period is less than the historical one. This result agree with the rainfall prediction. The generated rainfall for both scenarios are increase from existing period to 2080’s.

TRAFFIC DISTRIBUTION STUDY ON MULTI-AIRPORT SYSTEMS IN THE GREATER JAKARTA METROPOLITAN AREA (GJMA) AND ASSOCIATED IMPLICATIONS Faiz Agung Perdana; Richard Moxon
Journal of the Civil Engineering Forum VOLUME: XXIII/1 - JANUARY 2014
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Multi-airport system development is becoming a common solution to capacity constraint problems in metropolitan areas around the world. GJMA, as the biggest air transport market in Indonesia, have a plan to change their airport system from a single airport system to a multi-airport system because of capacity constraints. To relieve the congestion problem in the existing airport, an expansion project and a new airport plan are being proposed by the government. The new airport will be located in a green-field site around a hilly area in the Karawang Regency and plans to start operating in 2019.The government has not yet decided on the roles of the airport, but only proposed several scenarios to distribute the traffic for both airports. This study aims to understand the configuration of the traffic distribution of the new multi-airport system environment in GJMA, using a five step strategic planning methodology (CAIAD) which stands for Collect information, Analysing, Imaging, Assessing and Deciding.The results of the study show that the traffic distribution can lead to implications on the existing and planned infrastructure, and for the airport users. The main implications are traffic volatility, underutilized airport infrastructure, traffic demand, that cannot be accommodated by the airports, operational difficulty and poor service for the airport users. To minimize these implications, the government should start planning the development of the new airport based on flexibility related to the actual traffic demand and improved the transport access facilities. This study also suggests two scenarios as options for the government to implement in the GJMA multi-airport environment.Keywords: GJMA Airports, Capacity Constraint, Regulations Policy, Underutilize Airport and Airport Development.

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