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International Conference on Coastal and Delta Areas
Published by Universitas Islam Sultan Agung
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Core Subject : Science, Education,
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Arjuna Subject : Psikologi - Psikologi (Lain-Lain)
Articles 121 Documents
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The Analysis of Dimensional Changes and The Number of Simple Composite Girder Dimoro Bridge On The Southern Coast Access In Malang East Java Edy Gardjito
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Abstract

Accelerated development of cross-coastal access to southern eastern Java, known as the South Coast Cross Lane (JLS) very dependent with the topography of the southern region of Java island, about 65% of JLS are in mountainous and coastal areas. One of them is the construction of Dimoro Bridge in Malang East Java region with simple composite girder type spans 20.00 meters. According to basic design, girder dimensions use IWF. 980 x 350 x 10 x 35, with the number of girder n = 7 and the girder length 20.40 m. The issue of girder dimensions IWF. 980 x 350 x 10 x 35 is not mass-produced by the steel industry, so there needs to be a design review with the dimensions of girder in the steel industry market with IWF. 800 x 300 x 14 x 26. The analysis of dimensional changes and the number of simple composite girder is reviewed from : (1) the height of the girder profile approaching plan (d), because when the smallest (d) value is taken there will be more number of girder (n) installed. (2) the weight of the bridge structural steel approaching plan (Wr), since if Wr' < Wr means fulfilled by not changing the calculation of the bridge foundation, if Wr' > Wr then it is necessary to recalculate the strength of the bridge foundation. Analyze results for bending moments on IWF girder. 800 x 300 x 14 x 26 is obtained : M precomposite = 43850 kg.cm, M post-composite = 13816200 kg.cm. The moment of resistance (wb) due to Mpre and Mpost = 5003 cm3. Moment of inertia (Ix) = 282554 cm4 (table Ix = 292000 cm4). The moment of resistance (wx) = 7064 cm3 (table wx = 7290 cm3). Control of ultimate stress σau* = 2780 kg/cm2 is obtained Mmax = 12030000 kg.cm, σa' = Mmax/wx = 2405 kg/cm2 > σa = 1850 kg/cm2, the stress σa' exceeds the permit stress σa but still below ultimate stress σau* (safe). Control of deflection, for L/250 obtained Ix = 157733 cm4 < Ix plan = 282554 cm4 (safe). For L/360 obtained Ix = 201819 cm4 < Ix plan = 282554 cm4 (safe). Control of the shear stress obtained T = 229.76 kg.cm2 <T'= 0.58xσa = 0.58 x 1850 = 1073 kg.cm2 (safe). Control of tensile stress and press on composite girder, compressive stress σsu = 389.7 kg/cm2 < σa = 1850 kg/cm2 (safe), tensile stress σsl = 1123.3 kg/cm2 < σa = 1850 kg/cm2 (safe). Preferred on the composite girder is the compressive stress (σsu), and the resulting compressive stress (σsu) after the composite is smaller than the allowable stress (σa = 1850 kg/cm2; σau* = 2780 kg/cm2), the dimensional change IWF girder being 800 x 300 x 14 x 26 is safe to use. The change of girder number to IWF 800 x 300 x 14 x 26, profile area F = 261 cm2 (table F = 267 cm2), girder weight per m wt1 = 261x0.785 = 205.00 kg/m' (table = 210.00 kg/m'), weight 1 girder Wt(p) = 4100 kg. Needs of girder n'= Wt7/Wt(p) = 9.40 → taken 9 girder, Wt9 = 36900 kg < Wt plan = 38556 kg (ok). Accessories on the composite girder include : connection plate + bolt, diaphragm (bracing iron elbow) + bolt, shear-connector. Total weight of Accessories 9 girder = (3692+215+737) = 4644 kg. Total weight of composite bridge steel structure 9 girder Wr = 36900+4644 = 41544 kg < weight plan Wr = 41635 kg (fulfilled by not changing bridge foundation calculation). Keywords: pre-composite moment, post-composite moment, ultimate stress, deflection, shear stress.
The Analysis Of Risk Management Of Projects With Lumpsum Contract System and Unit Price Contract System Using AHP Method (Case Study Of Contractors In Semarang City) Muhammad Taufik; Kartono Wibowo; Abdul Rochim
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Abstract

In the construction project implementation, the contract is a bond between the project owner as the service user and the implementer / contractor as the service provider. The contract outlines the forms of cooperation, whether technical, commercial, or legal in a clear and detailed way. A fair contract should balance the rights and obligations between the two parties. So both parties should look at the articles in the contract so that the things that pose risks can be avoided. In the project implementation, the usual contracts are Lumpsum contract and Unit Price contract. The method used is Analytic Hierarchy Process (AHP) Method. The analysis process begins by defining the problem, and creating a hierarchical structure. This hierarchy consists of 3 (three) levels of objectives (level I), criteria (level II), and alternative (level III). Based on the hierarchy and then compiled questionnaires, Questionnaires were distributed to 71 respondents consisting of contractors in Semarang. The data obtained are then tabulated, followed by pairing matrices, pairing comparisons, measuring priority weights for level II and level III, and checking for consistency. This means that projects with lumpsum contracts are at higher risk of losses compared to unit price contracts. The Based on the result of cost swelling risk analysis, we get the priority weight for lumpsum contract equal to ≥50% and contract unit price ≤50%. Keywords: Risk, Methank, Analytic Hierarchy Process (AHP).
Integrated Implementation Conservation In DAS Serang (Study Case Institutional Group Of Land And Water Conservation Sampetan Village Subdistrict Ampel, District Boyolali) Sochis Sochis; Soedarsono Soedarsono; Muhammad Faiqun Ni&#039;am
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Abstract

Serang Watershed is a region dominated by steep slopes and high rainfall. This causes the region to have a high erosion potential. Water resources conservation activities in the upper watershed of Serang Watershed have been started with the construction of a number of conservation infrastructure. However, until now these efforts have not been assessed properly. This is because the existing institutional system is not functioning properly. This research discusses the strategy of conserving water resources activities in the study sites by Soil and Water Conservation Groups so that it is expected to overcome erosion problems at the research sites so as to improve the welfare of the community in the Serang watershed, especially Sampetan Village. Research method using questioner, interview, field survey, literature study, and SWOT analysis. Based from the analysis it can be concluded that by using the slovin formula, the number of respondents used as sample is 96 people from the population of 127 people consisting of various stakeholders including Village Government, Local Government, KKTA, and Community Leaders. Using SWOT method is analyzed external and internal factors of forestry and institutional resources of Sampetan Land and Water Conservation Group. Keywords : Erotion, Conservation, Institutional, SWOT.
Sensitivity Test of Betts-Miller-Janjic and Grell-3D Cumulus Schemes on WRF-ARW Model to Simulate the Heavy Rainfall Event in Lampung (Case Study: 20 February 2017) D Fatmasari; I J A. Saragih; A W Putra; I R Nugraheni
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Abstract

Lampung is a southernmost province on the island of Sumatra, Indonesia. The occurrence of heavy rain on 20 February 2017 caused flooding in some areas in Lampung. The heavy rain that lasts long enough, from 11:40 UTC to 23:00 UTC, is due to a group of convective clouds that form the Mesoscale Convective Complex (MCC) which observed on Himawari-8 satellite images. Data used in this research are FNL (Final Analysis) data from http://rda.ucar.edu/, Himawari-8 data from BMKG, and GSMaP rainfall data from ftp://hokusai.eorc.jaxa.jp. The aim of this study is to test the sensitivity of two cumulus parameterization schemes of WRF, they are Betts-Miller-Janjic and Grell-3D. Testing is done by using spatial verification and statistical verification. Overall, the output of both schemes shows that the Grell-3D scheme is good enough to describe the occurrence of the heavy rain event. Based on the results of the analysis of both schemes, it is shown that the atmospheric conditions over Lampung are very wet which is indicated by the height of the air moistness in each layer and supported by the convergence area and also the height of CAPE value which supported the formation of convective clouds during this heavy rain event.   Keywords: cumulus schemes, WRF-ARW, heavy rain
POTENTIAL AND PROBLEM FOR DEVELOPMENT COASTAL ZONE IN KENDAL, CENTRAL JAVA Abdul Rahman; Eppy Yuliani
International Conference on Coastal and Delta Areas Vol 1, No 2 (2015): the 2th International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Abstract

Kendal coastal area has a beach along the 43.5 kilometers. In the coastal area there are also many excellent potential but has not been used optimally. And also have not been indentified community needs for development in the coastal area of Kendal. So it needs to be studied further. The final result of this study that there is a potential for coastal fisheries sector in Kendal such as the amount of land on the embankment in District Brangsong and District Cepiring. In addition, there are also 4 (four) Fish Auction Place (TPI), that is TPI Tawang, TPI Bandengan, TPI Sendang Sikucing and TPI Tanggul Malang. To the potential of the tourism sector that has been managed well is a tourist attraction Beach Sendang Sikucing and Curugsewu. Problems found in coastal areas Kendal such as silting up the harbor pool in District Rowosari, breakwater already there yet function optimally in District Kendal. Besides not optimal utilization of fishery production caused undeveloped fish processing business and marketing of fisheries products in District Cepiring and the low level of income of small fishing and fish farmers. Thus, the development should be concentrated on two sectors that is the tourism sector, fisheries and marine sector.Keywords: Potential, Problems, Coastal Zone and Coastal Development
The Impact of Alluvial Land Subsidence Towards Extension of Inundation and Infrastructure Damage At Settlements Around Harbor Area of Tanjung Mas – Semarang Soedarsono .
International Conference on Coastal and Delta Areas Vol 1, No 1 (2015): Management and Engineering in the Sustainable Development on Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Abstract

Semarang is the capital of Central Java province of Indonesia, has an area of 373.4 km 2 with population of 1.571.341 million. Southern parts of this city are hilly, denudational and volcanic areas, whereas alluvial areas are located in the northern part of this place. In the alluvial areas, the land around keeps undergoing subsidence and this becomes a serious issue especially to the area growing naturally in the estuary area of Semarang River. While high tide is happening, sea water comes to thesettlements through some rivers and floods, as a result, settlement infrastructures are damaged and this potentially causes deseases. This research used survey method, evaluation towards the extention of inundation in the settlement over 941.14 Hectare, the resut would be a change on the extension of inundation in the settlement. Data analysis was conducted by using Geographic Information System (GIS). To know the impact of inundation to the settlement towards infrastructure damage, statistic with cross tabulation was used while deseases suffering by people around and health level due to the inundation, the analysis used the software of Statistical Product Service Solution (SPSS) version 16. Result of the research showed the year of 1996 (167,25 Hectare), year of 2010 (138,09 Hectare) andyear of 2015 (70,25 Hectare) from SPSS analysis in 2010. The result due to the inundation was happened settlement in the estuary in the amount of 20.10%. Between year of 2010 and 2015, was happened at the settlement to the inundation, caused by river normalization of Asin’s river and start functioning the pond’s retention Semarang river, settlement infrastructures are damaged and thispotentially causes deseases.
Community Participation In Forest Management Of Mangrove (Case Study: Mangrove Forest Area Tugurejo Semarang) Ardiana Yuli Puspitasari; Agus Rochani; Ahmad Ali Sadikin
International Conference on Coastal and Delta Areas Vol 1, No 1 (2015): Management and Engineering in the Sustainable Development on Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Abstract

As one of the coastal ecosystem, mangrove forest is a unique and fragile ecosystem. This ecosystem has the function of ecological and economical. Mangrove forest ecological functions include: protective shoreline, prevent the intrusion of sea water, habitat, feeding ground, where the care and nursery grounds, where spawning ground for a variety of aquatic biota, and as a regulator of the micro climate. Mangrove forests which naturally grow well along the northern coast of Java is almost does not exist. Natural forest on a small scale can only be found in the conservation area.Subdistrict Tugurejo has degraded mangrove areas either by aquaculture, as well as coastal erosion. Extensive mangroves in the coastal area around the Tugurejo District of 42.20 hectares (Department of Marine Semarang, 2010). Regional Regulation of Semarang No. 7 of 2010 on Spatial Planning Green Open mention that the vast green space mangrove forested coastal areas Tugu subdistrict of 225 hectares.
The Analysis of Liquefaction Potential Based on A Comparation of Various Cyclic Resistance Ratio Tri Wahyu Kuningsih; Rini Kusumawardani
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Prambanan Temple located in the Special Region of Yogyakarta is one of the most beautiful temples in the world. One of the potential geo hazards in the region of Prambanan is the earthquake. Geotechnically, the condition of the soil layer in Prambanan Temple consists of fine and uniform sand. Therefore, there is a possibility of liquefaction, if it receives the earthquake load. This study was aimed to investigate the condition of the subgrade of the Prambanan Temple foundation against the potential of liquefaction. Analysis of liquefaction potential in Regions Prambanan was conducted using semi-empirical method which were the cyclic stress ratio and cyclic resistance ratio with data from the field test results, Standard Penetration Test. The calculation of the value of peak ground acceleration was conducted using various empirical formula. The parameters of the liquefaction threat were based on Liquefaction Potential Index, Liquefaction Risk Index and Liquefaction Severity Index. The analysis showed that the peak ground acceleration value based on the 2006 Yogyakarta earthquake with a magnitude of 6.3 was 0,216g. Based on the condition of existing Prambanan temple with ground water level at -12 meters depth was safe against liquefaction threat. In case of an earthquake with greater strength than the 2006 Yogyakarta earthquake, with a PGA of 0.3 to 0.4g and shallow water level (-1 meters), then liquefaction might potentially occur. Keywords: Liquefaction, Cyclic Stress Ratio, Cyclic Resistance Ratio, Peak Ground Acceleration, Prambanan Temple
ANALYSIS OF CHANGE IN THE AREA OF INUNDATION DUE TO LAND SUBSIDENCE IN SEMARANG (A Case Study: Jl. Ahmad Yani, Jl. Erlangga Tengah, Jl. Sugiyopranoto) Pratikso Pratikso; Rahmat Mudiyono; Dian Indah Permatasari
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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Semarang is located on the north coast of Java island and develops in river flow area which genetically has alluvial materials. The process of precipitation continues until now and as a result a fairly thick layer of clay is founded. The layers of clay and land subsidence are related to each other. Land subsidence causes inundation or locally called rob area becoming increasingly widespread. The process of land subsidence causes a loss for the government of Semarang. The purpose of this study was to analyze the change in the area of inundation due to land subsidence in Semarang, on Ahmad Yani Street, Central Erlangga Street, and Sugiyopranoto Street, and give the best advice for the government to develop the city. Method of analysis used in this study was terzaghi method, GIS software (Geography Information System), and Plaxis software. The results showed that the rates of the land subsidence is getting bigger and the time is getting longer. Keywords: Land Subsidence, Terzaghi, Geography Information System, Plaxis
Analysis Of Effect Of Performance Of Public Works Department In Jepara With Balanced Scorecard Method And Regression Analysis Method Masrurotun Masrurotun; Antonius Antonius; Rachmat Mudiyono
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

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As a government agency with the largest budget utilization in the Government of Jepara, the Public Works Department of Jepara is required to demonstrate its performance optimally in meeting the needs of the community in the field of development. One of the efforts to monitor performance and maintain consistency in performing the task is performance measurement. The Balanced Scorecard (BSC) method and regression analysis method are used to design performance measurement systems to determine performance indicators appropriate to the organization's vision and mission. The purposes of this study are 1) to measure the performance of DPUD Jepara with Balanced Scorecard concept and concept of linear regression analysis with four perspective. 2) analyze the most dominant variable that affect the performance in DPUD Jepara. This study uses descriptive method with quantitative qualitative approach. Data collection is done by distributing questionnaires. The sample of study is 88 respondents. The results of study through Balance scorecard analysis with 4 perspective indicates that (1) Finance perspective include effectiveness, efficiency, and also budget transparency in good value (2) Customer prespectives include employee quantity, employee competence can reach optimum. (3) Internal business process perspective is considered good. (4) Learning and growth perspective is good because of salary conformity with work load, the existence of reward and punishment system. While through linear regression analysis showed that the four perspectives have an effect on Performance In DPUD Jepara. This result can be seen from result of ANOVA test or F test that show value of F arithmetic equal to 345.860 while value of F table equal to 2.48. The most dominant variables are finance perspective, internal business process perspective, learning & growth (infrastructure) perspectives. Keywords: Performance, Balanced Scorecard, Regression Analysis

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