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"Wharves"
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Wharfage : Sharjah Creek (2008-2009)
WHARFAGE is a one-of-a-kind maritime travelogue by artist studio CAMP, which explores the embodied labour and maritime movements between the creek of Sharjah, from where a large number of giant wooden ships built in the Gulf of Kutch in Gujarat among other places, and to the semi-state entities of Somalia. The book consists primarily of shipping manifests which act as a series of \"images\" of the darkness of the hold, and a calendar of what travelled in particular directions, on the water. Accompanying the manifests is documentary photography as well as extensive annotations on images. The artist book traces old trade routes and also maps anew a contemporary landscape of used things, ‘break-in-bulk’ ; cargo, multiple diasporas, and sea-craft \"going\" – ; in the midst of the global financial crisis – ; \"where no one else is going.\" --sharjahart.org
Book
Measures for mitigating the shrinking of the North Branch of Changjiang Estuary
The atrophy of the entrance channel in the North Branch of Changjiang Estuary and the sediment supplied by landward tidal flow from the sea to the branch, threaten the sustainable use of the numerous ports and wharves along the riversides. Four different plans of two groups to mitigate the shrinking of the North Branch were proposed and tested. The plans in the first group aimed to expand the entrance channel and the upper section of the North Branch through dredging. The purpose of the plans in the second group was to reduce the landward tidal volume in the lower section of the North Branch to reduce the sediment import from the sea. The effects of these plans were simulated by a 2D computational hydrodynamic model, and the results such as tidal volume at different sections, the portions of tidal volume in different branches, and the high and low tidal levels at the monitoring points, were obtained and compared. After that, one plan from each group was recommended. The measures of the recommended plans have been mostly adopted in the report of Revision of the Comprehensive Regulation and Development Plan of the Changjiang Estuary.
Journal Article
Gap Resonance Between a Stationary Box and a Vertical Wall Induced by Transient Focused Wave Groups
This paper explores the phenomenon of fluid resonance occurring within a narrow gap between a vessel and a vertical wharf, taking ships berthing in front of a gravity wharf as the research background. Using the open-source software OpenFOAM®, a two-dimensional viscous-flow numerical wave flume was developed to simulate the fluid resonant motions induced by transient focused wave groups with different spectral peak periods and wave amplitudes. The results indicate that for all the incident focused wave amplitudes considered, the amplitudes of the free surface elevation in the gap, horizontal wave force and moment all exhibit a bimodal variation trend with increasing spectral peak period. The peak values of the above amplitude-period curve appear near the resonant period of the first and second harmonic components of the free surface elevation. However, the variation in the vertical wave force versus the spectral peak period presents different patterns. In addition, the first- to fourth-order harmonic components in the wave surface and forces are further examined via the four-phase combination method. The results show that the first- to second-order harmonic components play a dominant role in the overall amplitude.
Journal Article
Coupling response of offshore floating wind turbine-wharf in process of installation
With the development of offshore wind power construction, high construction and maintenance costs have become a key issue restricting its development. The installation process is the key in construction. Therefore, based on AQWA and Orca Flex, a coupled numerical model of a floating wind turbine-wharf was established to study the response of the floating platform, the installation docking position, cables, and fenders in the floating installation process of the offshore floating wind turbine, and optimize the installation process. The results show that the hydrodynamic performance of the floating wind turbine is changed after coupling with the wharf, and cannot be ignored in the installation and maintenance. With the tower installation, the motion and acceleration of the installation docking position increase, and the response can be controlled by configuring the balance weight rationally.
Journal Article
Research on the engineering application of leakage diffusion theory based on finite volume method in LNG pipeline
In order to provide theoretical reference for the volume design of the terminal sump, this paper analyses the physical process of leakage and evaporation at the LNG terminal using. Combined with the theory of orifice leakage and evaporation diffusion and the actual project scenario, the corresponding mathematical model is given. From qualitative analysis, the main factors affecting LNG leakage and evaporation diffusion are given. The mathematical model is applied to engineering practice, and a large number of calculations are carried out to give the quantitative relationship between leakage, evaporation and diffusion and various influencing factors. Through research, it is found that the leakage of LNG is far greater than the evaporation on the wharf. When designing the volume of the sump, the evaporation of LNG on the wharf can be ignored. According to the leakage model of the pipeline orifice, the credible leakage volume in line with the actual project can be obtained.
Journal Article
Study on the Influence of Offshore Elevated Flare on the Layout of LNG Terminal
In order to save land, the elevated flare of the LNG terminal is usually considered to be arranged on the sea. The thermal radiation and leakage evaporation diffusion of elevated flare are the key issues to be considered in the plane layout of the wharf. In this paper, the physical process of the flare thermal radiation and the evaporation and diffusion of the terminal sump are analyzed by using engineering knowledge. Combined with the theory of thermal radiation and vapor diffusion and the actual project scenario, the corresponding mathematical model is given and applied to the engineering practice for a large number of calculations. The following conclusions are drawn: (1) The thermal radiation received by the LNG terminal is weakly related to the flare height, that is, the effect of increasing the flare height to control the thermal radiation at the header is not obvious; There is a linear positive correlation with the flare treatment capacity; It is strongly inversely proportional to the distance from the wharf to the flare. It is preferred to reduce the thermal radiation intensity at the wharf by adjusting the distance between the wharf and the flare. When the distance between the wharf and the flare is greater than 100m, the thermal radiation value of the wharf is always less than the specified limit. (2) Within the scope of conventional design, the safe distance between the wharf working platform and the flare is about 20∼90m; The optimal safe distance between the wharf fire control room, bridge approach pipe gallery and the flare should be greater than 61m and 41m respectively. (3) The combustible vapor concentration at the flare is linearly and positively correlated with the flare height, so the flare height should be reduced as much as possible during design. (4) The combustible vapor concentration at the flare is negatively correlated with the distance from the flare to the terminal sump. It is found that the distance should not be less than 180m through calculation. When the distance is more than 300m, the combustible vapor concentration at the flare has little relationship with the flare height and the ambient wind speed. When the distance is more than 340m, the combustible vapor concentration at the flare is always less than the specified limit.
Journal Article
Multi-Epoch 3D-Mapping-Aided Positioning using Bayesian Filtering Techniques
The performance of different filtering algorithms combined with 3D mapping-aided (3DMA) techniques is investigated in this paper. Several single- and multi-epoch filtering algorithms were implemented and then tested on static pedestrian navigation data collected in the City of London using a u-blox EVK M8T GNSS receiver and vehicle navigation data collected in Canary Wharf, London, by a trial van with a Racelogic Labsat 3 GNSS front-end. The results show that filtering has a greater impact on mobile positioning than static positioning, while 3DMA GNSS brings more significant improvements to positioning accuracy in denser environments than in more open areas. Thus, multi-epoch 3DMA GNSS filtering should bring the maximum benefit to mobile positioning in dense environments. In vehicle tests at Canary Wharf, 3DMA GNSS filtering reduced the RMS horizontal position error by approximately 68% and 57% compared to the single-epoch 3DMA GNSS and filtered conventional GNSS, respectively.
Journal Article
Research on overall bearing characteristics of high-piled wharf under horizontal load
Based on ANSYS model, this paper conducts simulation analysis of high-piled wharf. This paper studies the maximum stress of each pile in the bent frame, and obtains its change law. Through research, the load-displacement curve of the high-piled wharf is constructed, and the method for judging the overall ultimate bearing state of the high-piled wharf is established. The research results can provide a reference for the study and judgment of the overall bearing safety of high-piled wharf under horizontal load.
Journal Article
Study on Life-cycle Performance State Evaluation Method of Inland River Frame Vertical Wharf
The port project in the Three Gorges reservoir area is facing a very complex construction environment, such as water level drop as high as 30m, complicated geological conditions and natural disasters. Under the adverse incentives such as rough berthing of ships over tonnage, bank slope instability, overloading, wind and wave, material deterioration and earthquake, the pile foundation inevitably degenerates and accumulates different forms of structural damage. However, the existing analysis and monitoring methods can not know the damage effect of the bad inducement of the wharf, and can not evaluate the structural state of the most seriously damaged pile foundation, so most of the wharves are in a “sub-health” state for a long time. Under this background, this paper deeply analyzes the stress characteristics of the pile foundation of the inland river overhead vertical wharf under complex load conditions, and puts forward a new method which can not only trace the structural damage causes of the wharf, but also monitor the structural health status of the pile foundation itself, which can not only improve the cognitive level of the structural damage mechanism of the inland river overhead vertical wharf, but also guide the elimination of bad incentives in time at the initial stage of structural performance decline, thus ensuring the long-term safety and reliability of the wharf structure.
Journal Article
Application of Kalman filter in wharf surface displacement of Beidou automatic monitoring
To meet the requirements for real-time dynamic monitoring of wharf surface displacement, an automatic monitoring system based on Beidou satellite navigation was constructed, and it was applied to monitor the surface displacement of a wharf in Tianjin Port. Next, the sensible system noise of the Kalman filter state equation was determined by the simulation experiment. Finally, the monitoring data were processed and analyzed by Kalman filter. The results show that the accuracy of the monitoring data can be improved by more than 30% by Kalman filtering, particularly the elevation direction accuracy can reach more than 40%. The plane and elevation accuracy can be less than 1.5mm, after the Beidou automatic monitoring data has been processed by Kalman filtering, and this meets the needs for most engineering deformation monitoring. In a word, the Beidou automatic monitoring system is characterized by continuity, real-time and high precision, and can be applied to most engineering deformation monitoring requirements.
Journal Article