基于投入产出模型的港口经济贡献度研究

从经济社会发展以及资源利用角度,采用与国际接轨的理论方法、计算模型和指标体系对港口经济贡献进行系统研究。对港口相关经济活动进行广泛调研和科学识别,构建港口对地区经济贡献的评价指标体系,结合我国国情对国际通用的"投入产出模型"进行改进,摸索出适应我国经济发展特色和港口行业生产特点的港口经济贡献的测算方法,从而能够比较科学、全面、客观地衡量港口对城市和区域经济发展的贡献。     

水下拖缆抛物构型分析研究(英文)

This article discusses the dynamic state analysis of underwater towed-cable when tow-ship changes its speed in a direction making parabolic profile path. A three-dimensional model of underwater towed system is studied. The established governing equations for the system have been solved using the central implicit finite-difference method. The obtained difference non-linear coupled equations are solved by Newton's method and satisfactory results were achieved. The solution of this problem has practical importance in the estimation of dynamic loading and motion, and hence it is directly applicable to the enhancement of safety and the effectiveness of the offshore activities.     

Analyzing parabolic profile path for underwater towed-cable

This article discusses the dynamic state analysis of underwater towed-cable when tow-ship changes its speed in a direction making parabolic profile path. A three-dimensional model of underwater towed system is studied. The established governing equations for the system have been solved using the central implicit finite-difference method. The obtained difference non-linear coupled equations are solved by Newton＇s method and satisfactory results were achieved. The solution of this problem has practical importance in the estimation of dynamic loading and motion, and hence it is directly applicable to the enhancement of safety and the effectiveness of the offshore activities.     

围填海工程对曹妃甸海域水动力环境影响的数值分析

利用有限差分ADI方法建立曹妃甸海域平面二维水动力数学模型,并对模型进行了验证。通过对曹妃甸工业区围填海工程前后曹妃甸海域的潮流场的模拟,得出工程前后周边海域的潮流特征,分析了围填海工程对曹妃甸海域的影响范围及程度。结果表明,曹妃甸工业区围填海工程的实施对甸头、老龙沟及港区等产生一定的影响。     

Lessons Learned from Lake Shiwha Project

The Lake Shiwha Project was planned in the late of 1980s about 10 years before establishing ICZM policy and wetland conservation policy in Korea. The project was to build a dike of 12.7 kilometers in the mouth of a estuary, thereby to keep freshwater instead of brackish in the lake and to create land of 110 square kilometers for agriculture and industrial complex by draining out of associated wetland. However the Korean government abandoned keeping freshwater in the lake as soon as completing the dike because of not being able to control of serious pollution in the lake. This article analyzes the characteristics of the project such as bias of feasibility, degree of transformation and time period of loss of goal that led into environment disaster and extracts some implications for lessons.     

Travel-based multitasking: review of the role of digital activities and connectivity

ABSTRACT

Travel-based multitasking, also referred to as travel time use, is now a well-established concept, whose existence is supported by the technological trajectories, with mobile information and communication technologies (ICT) and vehicle automation working together to allow travel time to be more productive and enjoyable. Despite existence of reviews of travel-time multitasking studies, the systematic overview of the role digital activities, i.e. those that necessarily require modern ICT equipment to participate, has been limited, often wrapped under the umbrella term “use of ICT”, potentially obscuring their complexity and sophistication. Similarly, the role of connectivity and its attributes, e.g. speed (bandwidth), reliability, price, ease of use, data allowance or security, deserves a more systematic overview given its key role in enabling digital online activities and hence the travel-based multitasking options. This paper provides a review of 77 empirical travel-based multitasking-studies that explored the role of digital activities or connectivity. In particular, the review discusses the existing typologies of digital activities, dividing them into hardware-centric, function-centric or a combination of both (mixed). Subsequently, key contributions are discussed with respect to the treatment of digital activities and connectivity and its attributes. Based on the review, it is possible to observe that the existing studies have looked only at a handful of rather restricted online activities that do not sufficiently capture the sophistication with which individuals interact with the virtual world nowadays. Furthermore, the role of connectivity, although deeply embedded in the “C” of the “ICT” concept, has not been looked at or modelled in any detail in studies related to travel time use or its quality. This existing shortcoming might have resulted in an insufficient understanding of the mechanisms driving travel time use, the associated experience indicators of customer satisfaction, productivity or the consequences for relative attractiveness of transport modes. All of these considerations remain, however, crucial for designing, appraising and operating transport infrastructure and services that are able to take the advantage of lifestyle digitisation to meet the increasing customer needs while also delivering broader economic, social benefits and possibly also environmental benefits.     

大连新港潮流场整治模型试验研究

在分析大孤山矶头海岸水动力特性基础上,通过物理模型试验研究了大连新港海域潮流场整治工程措施。结果表明,受大孤山矶头岬角大范围地形影响,涨憩时回流一直存在,只能通过工程措施调整回流区的位置;近岸回填边界对回流区的位置调整影响显著。从工程区涨落潮流场、码头前沿横流大小等方面比选了工程方案,建议该类海岸流场整治工程应以归顺岸线工程为主,辅以其他相关工程。试验成果为设计方案的选取提供了科学依据。     

某吹填土上大型充填袋施工过程问题浅析

针对某工程在吹填土的地质条件下修建大型充填袋围埝中出现的问题和解决方案进行了详细阐述,并对原位观测、现场检测和现场情况进行深入分析,给出了问题发生基本原因和解决方案,为类似工程提供了参考依据。     

填海造地工程围堤失稳原因分析及应对措施

为防止填海造地工程中围堤失稳,结合某一填海造地实体工程,分析总结了工程中造成围堤失稳的原因及解决方案,对类似工程具有一定的借鉴意义。     

连云港港30万吨级航道一期工程围堤工程设计

在连云港港30万吨级航道一期工程中,约18 km长的围堤对整个工程的投资及施工进度影响非常大.针对当地建设条件提出爆破挤淤堤和排水板充填袋抛石混和斜坡堤组合的筑堤方案,达到了节约投资和缩短施工工期的效果.