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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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HYDRAULIC SIMULATION OF FLASH FLOOD AS TRIGGERED BY NATURAL DAM BREAK Yanuar Tri Kurniawan
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.18914

On January 1st, 2006 flash flood disaster (in Indonesia is known as banjir bandang) occurred in Kaliputih River, Jember District of East Java Province. This disaster resulted in more than 80 people were killed and hundreds were injured. The disaster was caused by natural dam break. The natural dam was formed by landslide due to heavy rainfall. After the January 2006 disaster, new cracks and crevices were found in the upstream area of Kaliputih River. Based on this condition, it cannot be disregarded to avoid repetition of similar disaster in the future. Therefore, it is required to conduct mitigation efforts in order to anticipate similar disaster in the future. One of the mitigation efforts is modeling simulation of the past event. The understanding which is obtained from the simulation can be used as reference to arrange other mitigation efforts plan and action .Modeling simulation of the January 2006 flood was conducted by involving 1-D model of HEC-RAS version 4.1.0 software. Flood hydrograph was obtained by analyzing related hydrologic aspects using Nakayasu method. The natural dam model was interpreted from field observation and related references. Some assumptions related to study constraints were taken. Model calibration was conducted by repeating simulation using fixed discharge and parameter values in a certain range. The observations were carried out to the maximum water surface elevation and it was traced to the downstream river.Calibration model result showed that the height of natural dam significantly influence changes of water surface elevation at control point. Tracing of flood result in reconstruction of January 2006 flood showed the conformity with the real event. It was observed from the arrival time of flood at certain location. From obtained results, it can be concluded that simulation modeling gave the acceptable results.

TRIP ASSIGNMENT MODEL WITH CONSIDERATION OF VEHICLE EMISSION: CASE FOR CIMAHI CITY Herawati Herawati
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Many cities in Indonesia are facing problems related to traffic and transportation such as Cimahi city which is located in the west part of West Java, Bandung. Traffic growth in Cimahi is caused by industrialisation and urbanisation which represent the main factor of increasing population and travel demand in Cimahi. The Local Government of Cimahi has started to avoid congestion by improving infrastructure facilities or other traffic management. Traffic assignment in four-step modelling is carried out as a basic to simulate the traffic management system. Traffic congestion generally happens especially in peak periods caused by the increasing number of private cars. Based on the reasons, the study only considers private car as a mode of transportation that will be assigned in peak hour periods. The technique of assignment used is user equilibrium and traffic assignment is run by using generalized cost. Generalized cost is calculated by actual cost and perceived cost (emission cost). CUBE software has been employed for this research to analyze traffic performance. CUBE software applies existing condition (base) and four scenarios. After modeling scenarios, those are acquired that scenario 4 as the best alternative for congested reduction in Cimahi. Indeed, Scenario 4 is recommended because significant result of v/c ratio value reduction and reducing number of congestion links by considering emission cost.

Stability Analysis and Failure Mechanisms of Open Pit Rock Slope Yahdi Azzuhry
Journal of the Civil Engineering Forum Vol. 2 No. 3 (September 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Rock mass in nature tend to be unideal, for it is heterogeneous, anisotropic and has discontinuity. The discontinuity makes anisotropic strength and stress in the rock mass, and also controls the changing of the elastic properties of rock mass. This condition results to disruptions in the rock mass strength balance, and finally drives the slopes to collapse. This study aims to determine the slope failure mechanisms in the area of case study, as well as its variations based on the Rock Mass Rating (RMR), Geological Strength Index (GSI), Slope Mass Rating (SMR), kinematic analysis, numerical analysis and monitoring approach slope movement in a coal mine slope applications. The site investigations were implemented to obtain information about slope collapse. Prior to the collapse, the slope inclination was 38° with of 94 meters height, strike slope of N 245 E and direction of slope surface of 335°. After the collapse, the slope was became 25º; and after the collapse materials were cleared, it was 35º. The discontinuity mapping obtained 5 sets of discontinuities, and the data were developed to obtain the value of RMR. The result of piezometer measurements was that at occurrence of collapse, slope elevation was 44.40m. Displacement value from monitoring SSMR showed that when the slope was collapsing in two stages, the first stage value was 70.61cm (a more critical condition, the value was rounded down to 70cm to the implementation in modelling) and the second stage value was at 124.25cm. The value of RMR89 in this study was greater than the value of GSI and SMR. As for the average value, it was obtained 34.67 for RMR89 value and 29.67 for GSI value, these rocks then can be classified into Poor Rock class number IV. The result of kinematic analysis found that sliding planar failure at dips 36°, and wedge failure at dips 36°, 35° and 34°. Acquisition SMR value obtained at 25, 27, 28 and 29. The SMR values classified the rock mass quality into class number IV, the description of the rock mass was relatively poor, the slope stability was low or unstable and the collapse manifold was planar or wedge failure. The result from the analysis of the model with its criteria obtained was that un-collapse conditions at angle 29°. It is recommended to use 29° angle to repair the slopes, and also recommended for overall high wall slope angle. Type of collapse that occurred on the slope failure mechanisms in all of the analysis that has been done, it is known that the mechanisms involved are complex types (combine of wedge failure, planar failure, and step-path failure) or classified into large scale rock slope failure surface.

EVALUATING AND DEVELOPING LOGISTICS SYSTEM FOR EXPORTING SMALL AND MEDIUM ENTERPRISES (CASE STUDY IN YOGYAKARTA PROVINCE AND ADJACENT AREAS, INDONESIA) Rizkie Syahputera
Journal of the Civil Engineering Forum VOLUME: XXII/3 - SEPTEMBER 2013
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Indonesia is ranked 75 of 155 countries in the world for the Logistics Performance Index. Thus, logistics services efficiency has to be improved to make sure SMEs can be more competitive and gain benefit from international trade arena. Yogyakarta with its viscous culture has become a favorite tourism destination, with many art craft products. Its unique location which far from seaport inflicts higher cost to the exporting cost. The study is to understand the system, understand the constraints and provide recommendation to improve the efficiency of current system.The study uses questionnaire survey as the method to gather the data. It consists of 2 surveys, on survey 1 on SMEs and survey 2 on forwarders. The analysis is mainly descriptive. Results of survey 1 are that the respondents are quite satisfied with current system which is 90% of total respondent, 82 % of total respondents never have problems with the customs, and the biggest problem is uncertain regulation. Results of survey 2 are 89 % of total respondent never have problem with customs, the biggest problem is bribery and uncertain regulations, and the time needed to export is quite long.The recommendations are established by developing 5th party logistics, constructing clear and market responsive regulations, and improving the facilities of transport infrastructure.Keywords: SME, logistics, Indonesia, export.

PERFORMANCE ANALYSIS ON FREIGHT TRANSPORTATION IN FURNITURE INDUSTRY, A CASE STUDY IN BANTUL, YOGYAKARTA, INDONESIA C. H. Soekamto; S. Priyanto
Journal of the Civil Engineering Forum Volume: XXI/1 - January 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

The Supply Chain Management is a new philosophy encouraging internal and external integration which encompass all the aspects, from the supplier until down to the customers. Transportation plays a major role in achieving efficiency and effectiveness because the role of transportation in the Supply Chain is as the intermediary help to distribute the physical goods from one entity to another entity. For this reason, the objective of this research is to analyse and measure the effectiveness and efficiency of inbound and outbound logistics in the furniture industry in Bantul, Yogyakarta. Firstly, the author will try to draw the supply chain mapping in order to gain more understanding about the entities in the supply chain. Secondly, performance of the transportation modes that will be used to move the furniture will be assessed through questionnaire. Thirdly, the author will try to analyse the response if rail transportation is proposed as an alternative transportation mode to move the goods. Lastly, conclusion and recommendation regarding the issue will be derived as implied in the result from data analysis. Keywords: Supply chain management, transportation, performance, furniture industry.

Review of Rainfall Hourly Distributionon the Island of Java Sri Harto Brotowiryatmo
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Rainfall hourly distribution is still a very important variable in the computation of the design of some hydraulic works. It has been generally known that this distribution will defer from one to the other region. The distribution defers from that exist in this area may invite additional inaccuracy in further analysis. This review presents some works which have been done in these last years, to fulfill the absence of this distribution on the island of Java region.Keywords: telemetry system; rainfall intensity; information spreading

MULTI-PERSON DECISION FOR SUSTAINABLE DESIGN ON IBS FLOOR SYSTEM SELECTION Christiono Utomo; N.A. Rahman; A. Idrus
Journal of the Civil Engineering Forum Volume: XXI/2 - May 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Selecting a design solution (choice problem) is one of the natures of design decision. If the problem is more complex and involves multi participants, decision aid is necessary. This paper discusses the nature of group judgment and negotiation on multi-criteria decision-making methodologies. It presents a conceptual model of negotiation support in a multi-person decision on building floor system selection. Decision technique (AHP) was applied for decision process in a satisfying options and game theory for coalition formation. An n-person cooperative game is represented by a set of all players. The proposed coalition formation model enables each agent to select individually or coalition. It improves the value of building system decision. It further emphasizes the importance of performance evaluation in the design process and value-based decision. The support model can be extended to an automated negotiation and in different building system selection with proper modification. Keywords: Multi-person, design decision, IBS, floor system selection.

Cengklik Reservoir Performance and Its Role for Drought Mitigation Yovi Hardiyanto
Journal of the Civil Engineering Forum Vol. 1 No. 2 (May 2015)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Water availability problem is encountered by Cengklik Reservoir due to drought disaster in the current year. It causes irrigation water crisis over 850 hectares crop field which of 350 hectares were not cultivated. The risk that must be faced by farmers is decrease in potential productivity, losses about more than 2.5 billion. Therefore, it needs technical solution to reduce this drought disaster risk. To obtain an alternative solution against water availability problem for drought disaster mitigation, this research used optimization of reservoir standard operating simulation. It applies field area of rice or Palawija at the second and/or the third cultivation season as decision variable, maximum productivity value as objective function, irrigation water demand as parameter depending on specified alternative crop pattern and schedule, and several constraints comprising 100% of reservoir reliability, all field is irrigated at the first and second season in which maximum non-irrigated crop field at the third cultivation season are 300 hectares. The tool used to conduct optimization was Microsoft Excel software. The result showed that crop pattern considered as an alternative solution against water availability problem in Cengklik reservoir is paddy-paddy-maize at the early of November II cultivated over 433 hectares and 1524 hectares. Risk reduction reached 9.33% in term of reservoir reliability, 23.61% in term of irrigated area, and 27.29% in term of vulnerability towards water availability crisis.

Hydro-Economic based Model of Damage and Loss Analysis of Winongo River Flood Muhammad Rifki Hardika
Journal of the Civil Engineering Forum Vol. 3 No. 2 (May 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Winongo River experienced considerably high flow that caused overflows along the downstream part of the river and some inundation at the surrounding area. The inundation has reached up to 1 m spread over the Tegalrejo Sub-district of Yogyakarta City and swept two houses. This paper analyses the damage and loss due to the flood by taking into account the hydraulics phenomena and the economic impact at the inundation area. A hydraulics model has been developed to study the flow characteristics during the flood of Winongo River, especially in the river reach in Tegalrejo Sub-district. The hazard-induced damages in the flooded area were identified and the economic impacts were studied. Several related software have been utilized to analyse the damage and loss of the disaster, including the HEC-RAS 5.0, ArcGIS, HEC-GeoRAS and InaSAFE. Through the integration of the characteristics of both flood phenomena and the economic factor, the damage and loss were then analysed and the Average Annual Damage (AAD) of approximately IDR 88,750,000,000 was obtained.

EVACUATION ROUTE MAPPING AGAINST SLAMET VOLCANO DISASTER AT GUNUNGSARI VILLAGE, PULOSARI SUB DISTRICT, PEMALANG DISTRICT Misdiyanto Misdiyanto; Djoko Legono; Subagyo Pramumijoyo
Journal of the Civil Engineering Forum VOLUME: XXIII/1 - JANUARY 2014
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Villages inside the hazard zone of Slamet Volcano should have an evacuation map, as an anticipation and guidance to guide people evacuate when volcanic activity on the area arise to dangerous level. The experience which occurred at 2009 and 2010 indicate the necessity of the development of evacuation map for 7 villages inside the hazard zone in the Pemalang residential district, such as village of Gunung Sari. The main purpose of the developing an evacuation map is to make the village of Gunung sari becoming more vigilant to anticipate the danger of Slamet Mount eruption. Qualitative methods were used in this study, by handing out preliminary questionnaire to investigate the characteristic of the residents. The development of evacuation map also relies on the participation of the residents, then the resulted map were evaluated by assessing how far people can understand and comprehend any information provided on the map. The result of the investigation shows that Gunungsari’s resident wants an evacuation map, shown by high enthusiasm on the questions of the necessity of an evacuation map and disaster preparedness team that is equal to 97% of the residents on Dusun Sipendil, 83% on dusun Sibedil, 67% on Dusun Silegok, and 63% on Dusun Krajan. The residents also understand and comprehend the information provided on the map nicely, especially about the timing and rendezvous location for the evacuation. It is indicated by high proportion of residents that answer the questions asked accurately, which is 100% on Dusun Sipendil, 97% on Dusun Sibedil, and 80% for both Dusun Silegok and Dusun Krajan.Keywords: disaster prone area, evacuation map, society characteristic

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