International Journal of Offshore and Coastal Engineeing最新文献_第6页

Impact of Reclamation Development on Sedimentation and Current Pattern in East Coast Surabaya (Pamurbaya) 填海开发对泗水东海岸(帕穆尔巴亚)沉积和水流格局的影响

International Journal of Offshore and Coastal Engineeing Pub Date : 2017-11-28 DOI: 10.12962/j2580-0914.v1i2.7055

S. Suntoyo, Mohammad Iqbal Hidayah, H. Ikhwani

{"title":"Impact of Reclamation Development on Sedimentation and Current Pattern in East Coast Surabaya (Pamurbaya)","authors":"S. Suntoyo, Mohammad Iqbal Hidayah, H. Ikhwani","doi":"10.12962/j2580-0914.v1i2.7055","DOIUrl":"https://doi.org/10.12962/j2580-0914.v1i2.7055","url":null,"abstract":"Reclamation is an effort to establish a new land area either in coastal areas or in the middle of the ocean. In Pamurbaya area a number of property projects both housing and apartments is still continuing. Environmental impacts of the coastal reclamation project is in the potential increase of flooding. The changes include the extent of the cluster, the composition of river sediments, the tidal pattern, the pattern of ocean currents along the coast and damaging the water system. This study examines changes in current patterns, morphology, and sedimentation rate due to the reclamation modeled using Delft3D software. The pattern of current flow after the reclamation has changed. Basic surface changes that occur before and after reclamation in each crossection is by difference, crossection 1 = +0.22 m, crossection 2 = -0.19 m, and crossection 3 = +0.11 m. The sign (+) shows the occurrence of sedimentation, while (-) is erosion. The condition after the reclamation in crossection 1 is sedimentation, crossection 2 is erosion, and crossection 3 is sedimentation. The difference in intensity is very small, therefore the erosion and sedimentation which took place after reclamation is not too significant.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124555234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Prelimenary Modeling for Assessing Tidal Stream Energy Potential at the Alas Strait, Indonesia 评估印尼阿拉斯海峡潮汐流能量潜力的前期模拟

International Journal of Offshore and Coastal Engineeing Pub Date : 2017-11-28 DOI: 10.12962/j2580-0914.v1i2.7056

M. Mukhtasor, Luli Bangkit Sugito, Sujantoko Sujantoko

{"title":"Prelimenary Modeling for Assessing Tidal Stream Energy Potential at the Alas Strait, Indonesia","authors":"M. Mukhtasor, Luli Bangkit Sugito, Sujantoko Sujantoko","doi":"10.12962/j2580-0914.v1i2.7056","DOIUrl":"https://doi.org/10.12962/j2580-0914.v1i2.7056","url":null,"abstract":"This study is on ocean current prelimenary modelling in Alas Strait, Indonesia, to be compared with the field observation data. The model maps coordinate for ocean current so that the potential energy resource can be identified. The model simulation is established with two different scenarios; the first scenario is using windspeed factor and the second without using that factor. Complementary variables such as bathymetry, water elevation, bottom friction, and eddy viscosity have the same value for both scenarios. This ocean current modelling use finite element method with flexible mesh. This method use two dimension numerical solution from the average incompressible Reynolds Navier – Stokes equation with the assumption from Boussinesq dan hydrostatic pressure. This model consists of continuity equation and momentum which closed by turbulen scheme. This study concludes the first scenario is a success and valid with the water surface elevation mean error is 4.2% and water current speed mean error is 10.7%. The second scenario is unseccesful as indicated by the water surface elevation mean error of 13.4% and the water current speed mean error of 11,7%, and also the phase and the trend of current speed is verging the field observation data.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130625437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analitical Study of Vertical and Lateral Buckling on Pipeline Using Hobbs Method 基于Hobbs方法的管道纵向和横向屈曲分析研究

International Journal of Offshore and Coastal Engineeing Pub Date : 2017-11-28 DOI: 10.12962/j2580-0914.v1i2.7058

Y. Hadiwidodo, Muhammad M Romadhoni, H. Pratikno

{"title":"Analitical Study of Vertical and Lateral Buckling on Pipeline Using Hobbs Method","authors":"Y. Hadiwidodo, Muhammad M Romadhoni, H. Pratikno","doi":"10.12962/j2580-0914.v1i2.7058","DOIUrl":"https://doi.org/10.12962/j2580-0914.v1i2.7058","url":null,"abstract":"During its operation, the pipeline will receive loads of internal pressure and thermal loads of fluid flowed until the pipes have both vertical and lateral buckling. Numerical analysis of vertical and lateral buckling Hobbs this method on a high friction coefficient and the coefficient of friction (0.3 ≤ φ ≤ 0.7) as well as the length of buckling as many as 20 variants were then performed comparisons, as well as axial tension comparison with DnV RP L110. So we get the relationship of temperature increase with the length and amplitude buckling. The data which is used is the gas pipeline Labuhan Maringgai-Muara Bekasi PT. Perusahaan Gas Negara (Persero) Tbk., Including the outer diameter of the pipe = 0.8128 m, plate thickness = 0.015875 m, thermal linear expansion coefficient = 11 x 10-6 m / oC, etc. So the higher coefficient of friction, temperature rise of 13.4%, 13.4% reduced buckling length, and axial tension increased to 12.95%. For the comparisons, the coefficient of friction does not affect the length of buckling on the vertical buckling. Comparison with DnV RP F110, increased coefficient of friction will increase the voltage axial (Seff) of 0.00024% and up 13.4% axial stress (P0) Hobbs.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125834129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Risk Analysis on Leakage Failures of Pipelines Using Hybrid Risk Analysis Method 基于混合风险分析法的管道泄漏失效风险分析

International Journal of Offshore and Coastal Engineeing Pub Date : 2017-11-28 DOI: 10.12962/j2580-0914.v1i2.7057

D. Rosyid, Bassam Muhammad Drehem, A. Wisudawan

{"title":"Risk Analysis on Leakage Failures of Pipelines Using Hybrid Risk Analysis Method","authors":"D. Rosyid, Bassam Muhammad Drehem, A. Wisudawan","doi":"10.12962/j2580-0914.v1i2.7057","DOIUrl":"https://doi.org/10.12962/j2580-0914.v1i2.7057","url":null,"abstract":"In this final project has been conducted a study on risk analysis on subsea pipeline leakage by using hybrid risk analysis method. The study begins by determining the scope of the analysis using fault tree analysis which can be determined the main event of the leakage failure of subsea pipeline until the basic event. After determining the scope of the analysis then proceeded to calculate the frequency of each event using the quantitative method. In this calculation is known the frequency of basic event through data from scientific paper programming and scientific research and then calculated the frequency result of top event using Boolean Equation until we get the frequency of failure due to leakage pipelines for 0.0141213. After knowing how big the probability of failure, followed by determining how much impact or consequence of the failure. The consequences of failure are determined based on their impact on safety, environment, and business. In the determination of the impact with the qualitative method using questionnaires interviews to some respondents. After obtaining the result of questionnaire interview then calculated the mean of the questionnaire result to determine how big impact of the failure is based on safety, environment, and business. After knowing how big the probability and consequences of the failure, then determine the position of the risk zone on the risk matrix that refers to DNV RP-G101. After knowing the position of the risk zone, it can be determined how to control risk based on cause-effect.","PeriodicalId":182495,"journal":{"name":"International Journal of Offshore and Coastal Engineeing","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133289422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0