International Journal of Coastal and Offshore Engineering最新文献_第5页

A Knowledge Based Decommissioning Alternative Selection System for Fixed Offshore Oil and Gas Platforms in Persian Gulf 基于知识的波斯湾固定式海上油气平台退役选择系统

International Journal of Coastal and Offshore Engineering Pub Date : 2018-09-01 DOI: 10.29252/IJCOE.2.2.45

P. Edalat, Mohamad Baqery

{"title":"A Knowledge Based Decommissioning Alternative Selection System for Fixed Offshore Oil and Gas Platforms in Persian Gulf","authors":"P. Edalat, Mohamad Baqery","doi":"10.29252/IJCOE.2.2.45","DOIUrl":"https://doi.org/10.29252/IJCOE.2.2.45","url":null,"abstract":"Article History: Received: 23 Jun. 2018 Accepted: 12 Sep. 2018 Complexity and costly nature of operations involving in the decommissioning process require huge investments to be done during the lifetime of the field for its decommissioning phase of the total project. This work offers a knowledgebased decommissioning alternative strategy selection system for fixed offshore jacket platforms in the Persian Gulf. In this method, the alternative option of installing offshore wind turbines (OWT) as the most probable economic feasible alternative to decommissioning on an abandoned platform jacket structure in the Persian Gulf is proposed. In this regard, costs and benefits study between two strategies are considered; one total decommissioning and the other installing an OWT on the jacket structure of a local platform in the region. It is found that the second strategy is beneficial and saves near 9 million US dollars for company. Furthermore, the company earns the technology and experiences with OWT installation and operations and would be a technical leader in the region for coming years as well as improve the total rate of greenhouse gas emission production in the region.","PeriodicalId":33914,"journal":{"name":"International Journal of Coastal and Offshore Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45730337","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

Automatic Coastline Extraction Using Radar and Optical Satellite Imagery and Wavelet-IHS Fusion Method 基于雷达和光学卫星图像的海岸线自动提取及小波- ihs融合方法

International Journal of Coastal and Offshore Engineering Pub Date : 2018-09-01 DOI: 10.29252/IJCOE.2.2.11

Hasan Mirsane, Yaser Maghsoudi, R. Emadi, M. Mostafavi

引用次数: 5

Numerical Study of Winter Shamal Wind Forcing on the Surface Current and Wave Field in Bushehr's Offshore Using MIKE21 利用MIKE21对布什尔近海冬季萨满风对海面海流场和波浪场的数值研究

International Journal of Coastal and Offshore Engineering Pub Date : 2018-09-01 DOI: 10.29252/ijcoe.2.2.57

M. Pakhirehzan, M. Rahbani, H. Malakooti

{"title":"Numerical Study of Winter Shamal Wind Forcing on the Surface Current and Wave Field in Bushehr's Offshore Using MIKE21","authors":"M. Pakhirehzan, M. Rahbani, H. Malakooti","doi":"10.29252/ijcoe.2.2.57","DOIUrl":"https://doi.org/10.29252/ijcoe.2.2.57","url":null,"abstract":"Marine areas are affected by different atmospheric phenomena such as wind and storm. In this research the effect of a large scale atmospheric phenomenon, known as Winter Shamal Wind, is investigated on the regime of currents and waves in the northwest part of the Persian Gulf. This wind normally occurs for the period of three to seven days, during December to early March. MIKE21 Coupled Model FM was applied to study the pattern of current and waves for this period. To provide the hydrodynamic data for the model and validate the simulated results, the wind data of ECMWF and mast meteorology of coastal synoptic station of Bushehr and wave data of buoy located offshore of Bushehr was used. The results indicated only a slight increase in current speed with no significant change in current direction during Winter Shamal Wind, showing a stable current pattern in northwest of the Persian Gulf. The significant wave height and wave propagation speed for the period of Winter Shamal Wind in comparison with the days prior to the wind show significant changes. The maximum wave speed in the area under investigation reaches up to 1 m/s and the significant wave height is almost 1 meter higher than that of normal situation.","PeriodicalId":33914,"journal":{"name":"International Journal of Coastal and Offshore Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45973207","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: 2

Free Vibration Analysis of Very Large Rectangular Floating Structures 超大型矩形浮式结构的自由振动分析

International Journal of Coastal and Offshore Engineering Pub Date : 2018-06-01 DOI: 10.29252/IJCOE.2.1.59

Tannaz Hadizadeh Asar, K. Sadeghi, A. Emami

引用次数: 1

Numerical Simulation of the Wind-Induced Current in the Caspian Sea 里海风致流的数值模拟

International Journal of Coastal and Offshore Engineering Pub Date : 2018-06-01 DOI: 10.29252/IJCOE.2.1.67

Jalal Mofidi, A. R. E. Hesari

引用次数: 3

Prediction of Structural Response for HSSCC Deep Beams Implementing a Machine Learning Approach 采用机器学习方法预测HSSCC深梁的结构响应

International Journal of Coastal and Offshore Engineering Pub Date : 2018-06-01 DOI: 10.29252/IJCOE.2.1.35

Mohammad Mohammadhassani, M. Zarrini, E. N. Farsangi, Neda Khadem Gerayli

引用次数: 5

A Comprehensive Study of an Identical Submarine Subjected to Explosion 同一潜艇爆炸综合研究

International Journal of Coastal and Offshore Engineering Pub Date : 2018-06-01 DOI: 10.29252/IJCOE.2.1.21

R. Amirabadi, Reza Ghazangian

引用次数: 3

Reliability Assurance of Subsea Production Systems: A Systems Engineering Framework 海底生产系统的可靠性保证：一个系统工程框架

International Journal of Coastal and Offshore Engineering Pub Date : 2018-06-01 DOI: 10.29252/IJCOE.2.1.1

S. Yasseri, H. Bahai, Ramin Yasseri

{"title":"Reliability Assurance of Subsea Production Systems: A Systems Engineering Framework","authors":"S. Yasseri, H. Bahai, Ramin Yasseri","doi":"10.29252/IJCOE.2.1.1","DOIUrl":"https://doi.org/10.29252/IJCOE.2.1.1","url":null,"abstract":"Article History: Received: 16 Jan. 2018 Accepted: 15 May. 2018 Due to the high investment costs for deep-water subsea production systems of high-value subsea fields, it is crucial to ensure a high availability to recover the investment. The problem is compounded by the cost of recovery, repair and replacement of failed equipment. Testing and reliability analyses are two pillars of reliability assurance; neither of them on their own assures the delivery of a reliable system. Possibly with more imaginative use of reliability methods, it is possible to optimise testing. It is suggested to use reliability analysis as a guide for allocating resources for testing. This paper outlines a Systems Engineering Framework to link the Client’s requirements for equipment reliability, as a means of proving the desired level of performance. This framework allows a better understanding of verification settings and strategies to handle constraints (e.g. costs, expandability, repair-ability, maintainability, intervention procedures, downtime, automation etc.) and performance measures, to achieve highly reliable production systems. The bilateral links between the Client’s requirements and subsea equipment performance are established using the systems engineering V-model. These links relate equipment performance to one or more of the Client’s requirements, which helps establish verification and validation testing strategies to enhance reliability and reduce project risk. The proposed procedure also assists risk management efforts by feeding the results of reliability analyses, testing and project risk analysis into validation processes, the systems engineering measurement process ensures enhanced reliability. We define reliability assurance as a part of the systems engineering processes to ensure the continued function and resilience of the production system from the downhole valve to the subsea equipment, housed on the topside or at an onshore terminal, in their operating environment and condition using the “FitFor-Service” notion.","PeriodicalId":33914,"journal":{"name":"International Journal of Coastal and Offshore Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41960813","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: 6

Evaluatoin of Incompressible and Compressible SPH Methods in Modeling Dam Break Flows 不可压缩和可压缩SPH方法在溃坝流建模中的评价

International Journal of Coastal and Offshore Engineering Pub Date : 2018-06-01 DOI: 10.29252/IJCOE.2.1.45

H. Akbari

{"title":"Evaluatoin of Incompressible and Compressible SPH Methods in Modeling Dam Break Flows","authors":"H. Akbari","doi":"10.29252/IJCOE.2.1.45","DOIUrl":"https://doi.org/10.29252/IJCOE.2.1.45","url":null,"abstract":"Article History: Received: 27 Nov. 2017 Accepted: 15 Jun. 2018 Smoothed Particle Hydrodynamic (SPH) is an attractive Lagrangian tool for simulating flows with large displacement at free surface boundary. Two widely used subcategories of this method are Weakly compressible SPH (WCSPH) and truly Incompressible SPH (ISPH) methods. Each method has its individual advantages while there is not yet a global agreement about the preference of one method to another one. In this study, accuracy, stability and efficiency of these methods are compared in simulating dam break flow as a well-known hydraulic problem. To decrease unrealistic particle fluctuation especially at free surface boundary, a practical solution is applied to both methods while keeping their total accuracy. In addition, different solid boundary treatments are studied and their effect on total accuracy and stability of SPH methods are investigated. Based on the results, both ISPH and WCSPH methods can model free surface profiles properly if a proper solid boundary treatment is utilized. Meanwhile, local surface fluctuations can be damped in both methods efficiently by means of the modified surface viscosity. By means of original versions, it is concluded that ISPH method is generally more stable and more accurate particularly in modeling pressure field than WCSPH method. In addition, it is shown that ISPH method is faster than WCSPH method in solving a dam break flow with equal number of particles. On the other hand, ISPH in its original version using the divergence-free velocity scheme suffers from density loss problem. Since a lot of modifications have been introduced till now to overcome defections of both methods, it is not fair to compare methods with different modifications and therefore, similar modifications are applied in this study. Meanwhile, it can be concluded that each method is growing and is going its own way through enhancement.","PeriodicalId":33914,"journal":{"name":"International Journal of Coastal and Offshore Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49504381","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: 7