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Abstract:
The artificial fishing mound (AFM) is constructed in deepwater by dumping a large amount of rubble or concrete blocks from a hopper barge to expand the fishing ground by uplifting the eutrophied water with the upwelling current generated on mound. In order to produce a designed geometry of AFM accurately and effectively, the operation management for the discharge position of barge, which is taken the transfer displacement of the falling blocks by the current into consideration, is required. In this study, the numerical simulation model to estimate the spatial deposition configuration of blocks dumped from barges has been expanded for the current field, and its practical adaptability has been verified by the field experiments. Furthermore, the management system on positioning of the barge, which is correspondent to the real-time utilization in the field, is developed by linking this simulation model and the inputoutput divisions for the ADCP measured data, the simulated shape of AFM and the position of barge.Keywords:
BARGE
Rubble
Position (finance)
Topics:
대부분의 사고선박 예인력 계산을 위한 선체저항 성능 추정은 매우 간단하고 오래된 방법을 사용하고 있는데, 특히 바지선의 경우는 미국 해군 예인 매뉴얼에서 사용하는 방법과 유사한 방법을 사용하고 있다. 본 논문에서는 미국 해군 예인 매뉴얼 방법과 국내 해양수산부 고시 방법을 검토한 결과, 이는 비합리적이고 부정확한 추정 방법임을 밝혔다. 나아가, 바지선에 적용할 수 있는 합리적이고도 정확한 저항 성능 추정 방법으로 새로운 Modified-Yamagata-Barge 방법을 도출하였다.
BARGE
Towing
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Citations (7)
The studies on floating offshore wind turbines (FOWTs) have been increasing over recent decades due to the growing interest in offshore renewable energy. The present paper proposes a barge platform with four moonpools to support the Technical University of Denmark 10 MW wind turbine for a designed water depth of 60 m. A 4 × 2 mooring system with eight mooring lines is also proposed for the barge platform. The main dimensions of the barge platform are optimally selected with respect to its preliminary hydrodynamic properties and potential financial benefit. The proposed barge-type FOWT is then demonstrated to be aligned with the DNV standard requirements in terms of its intact and damage stability. Furthermore, coupled time-domain simulations are conducted for the proposed barge FOWT with mooring under the selected environmental and operational conditions by using Simo-Riflex-AeroDyn (SRA). Through decay test simulations, the natural periods of the barge-type FOWT are demonstrated to be within the DNV recommended ranges. The proposed mooring system is also benchmarked with the 3 × 3 mooring concept that was used for a 3 MW barge-type FOWT installed in Kitakyushu. The response magnitudes of the barge platform and mooring line tension are similar to both mooring systems, and thus the 4 × 2 mooring system is preferred due to its lower cost. In addition, the proposed barge platform is preliminarily demonstrated to be able to survive for the 50-year extreme environmental conditions under parked wind turbine status, as well as the normal environmental conditions under the operating status.
BARGE
Mooring
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Because of its DP thrusters, the free-floating draft of the semi-submersible drilling rig GSF Development Driller I was too deep for a safe tow-out from Ingleside, TX, to open waters. In order to reduce the semi’s draft, a large cargo barge was used to lift the rig 1.0 m (3.3 ft) and thus create a reasonable ground clearance. The barge was selected, based on dimension, ballast capability, deck strength, price, and availability. Eight support brackets were welded to the barge sides and strong diaphragms welded inside the four rig braces. Detailed time domain motion analyses were performed to study the behavior of the combined units during the tow and barge removal operation offshore. In April of 2006, during a favorable weather window, the combined units were successfully towed through the channels and once in deeper waters, the barge was ballasted down and pulled out from under the rig.
BARGE
Ballast
Mooring
Drilling rig
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This paper presents the structure form of leveling barge,equipment disposition and the advanced system of satellite positioning and photogrammetry.This barge could directly level down rubble of 10～100kg in the works of leveling rubble bed underwater of the phase I regulation project of Yangtze estuary navigation,changing the complicated works underwater to operation on barge.It had achieved the integration of riprapping,leveling and quality testing.Both the efficiency and precision are extremely high.
BARGE
Rubble
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BARGE
Mooring
Dynamic positioning
Position (finance)
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Citations (1)
The Leg Mating Unit (LMU) is a critical component in ensuring safe method of installing topsides of offshore oil and gas platforms by the float-over method. Traditionally, topsides are lifted onto the substructure (e.g. jacket) using heavy lift crane vessels. However, the ‘lift’ method of installation is constrained by the availability of a limited number of heavy lift vessels in the region, with high day rates. As an alternative to modular installation with light crane vessels, float-over installation enables installation of a single pre-commissioned integrated deck, minimizing offshore hook-up time and cost. Further, float-over method is particularly suited to shallow water depth locations, remote locations (with no access to crane vessels). In a float-over installation, the deck is transported on a cargo barge to the pre-installed substructure location. The barge is guided into the jacket slot and positioned so that the stabbing cone on each leg is aligned with the corresponding jacket leg. The barge is then ballasted down (aided by the falling tide) so that the topside load is transferred from the barge to the jacket. Once the load is transferred and sufficient clearance is achieved between the deck structure and barge support structure, the barge is withdrawn from the slot. The transfer of load is the crucial step of a float-over installation and should occur in a controlled manner under the dynamic influence of environmental forces. This smooth load transfer is achieved using LMU’s. LMU’s are customized leg and deck mating units, used to dampen the impact loads generated during the mating process. They consist of steel structures with elastomer elements and are designed to perform three primary functions, absorb shocks, limit hammering onto the structures and provide defined stiffness between deck and sub-structure. The objective of this paper is to outline the design philosophy of a LMU and address the behavior of the LMU under the combination of vertical and horizontal loads during the mating process. The paper also recommends guidelines on the selection of elastomer stiffness based on load-displacement relationship. The LMU is analysed in ABAQUS, a commercially available finite element (FE) analysis package considering a non-linear time-domain analysis. The results from the FE analysis are compared with the qualification tests for the elastomer and LMU assembly performed on-site to establish correlation.
BARGE
Float (project management)
Winch
Lift (data mining)
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BARGE
Float (project management)
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Float-over installation method has been recently used to install topsides onto jacket type of platform. As a viable alternative to the traditional lifting installation method, this method uses a float-over barge to transport and install topsides onto the platform by ballasting operations. This method eliminates the use of heavy lift vessel, and thus is economical for a platform with heavy topsides. The motions of the barge during float-over installation are critical and must be analyzed to ensure successful operations. For the study presented in this paper, the model tests for a float-over barge were conducted on a model following Froude Scaling Laws with geometric scale ratio of 1:50. The model was tested in random wave sea states with varying drafts. The result of the physical modeling study are then analyzed and presented in terms of Response Amplitude Operators (RAOs) for surge, heave and pitch. The results quantify the importance of design parameters such as draft or ballast condition in the response of float-over barge.
BARGE
Float (project management)
Froude number
Ballast
Mooring
Lift (data mining)
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BARGE
Rubble
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An analysis method to determine the behaviour of a moored ship due to wash waves created by a passing fast vessel has been developed. The method can be used for quantitative assessment of the motions of the moored vessels due to wash waves. In this paper a short review of the main elements of the computational method is given and comparisons made with results of model tests carried out at MARIN with the concept of a fast passenger ferry and a captive barge representing a moored vessel. Besides having the possibility to analyse, in the design stage of a fast vessel, the effects on other waterway users, criteria are needed to determine acceptable limits for the motions and accelerations of the moored vessel as caused by the passing vessel. In this paper motion criteria developed based on a comprehensive field study carried out in the Netherlands using the experiences of crew members of moored barges are compared with results of computations of barge motions.
BARGE
Ship motions
Mooring
Response amplitude operator
Naval architecture
Research vessel
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Citations (2)