Small Commercial Fishing Vessel Stability Analysis: Where Are We Now? Where Are We Going?

2003 ◽  
Vol 40 (04) ◽  
pp. 296-302
Author(s):  
John Womack
Keyword(s):  
Stability Analysis ◽  
Dynamic Environment ◽  
Commercial Fishing ◽  
Fishing Vessel ◽  
Fishing Vessels ◽  
The Many ◽  
Vessel Stability ◽  
Marine Vessels ◽  
Current Risk

Small commercial fishing vessels are the largest, most diverse, and constantly evolving class of marine vessels in existence. Yet the methods used to evaluate their stability reflect a one size fits all approach with little improvement over the many decades since their introduction in the early 1900s. This conflict coupled with significant flaws in the methods used to convey stability guidance to the crews leads to unacceptable risks being taken and fishing vessels and their crews being lost. Improvements are needed in all areas of small commercial fishing vessel analysis: better criteria that reflect the true dynamic environment faced by the crews, better means to convey stability guidance, including the current risk of capsize to the crews, and lastly a program to teach stability and how to use the guidance provided.

A Systematic Study of Wave Phasing on Righting Arm Curves for Fishing Vessels

2005 ◽  
Author(s):  
John Womack ◽  
Bruce Johnson
Keyword(s):  
Software Package ◽  
Cost Effective ◽  
Future Research ◽  
Stability Criteria ◽  
Fishing Vessel ◽  
Fishing Vessels ◽  
Software Packages ◽  
Wave Effects ◽  
Vessel Stability ◽  
Naval Architect

This paper summarizes the results from the SNAME funded T&R grant titled Preliminary Development of the Next Generation of Stability Criteria for Small Fishing Boats. The principal goal of this project was to take a broad look at effects of head and following waves on the current still water based stability evaluation methods to focus the needs for future research in the development of new performance based stability criteria. The wave effects were calculated using an off the shelf naval architect software package of the type typically used in small fishing vessel stability evaluations to explore the ability of these software packages to perform cost effective meaningful stability research. The use of the off the shelf naval architect software package also allowed the authors to explore new performance based stability criteria formats that utilized software and basic concepts already available to the naval architect.

A Vessel is its Own Best Lifeboat: Prevention of Casualties through Education

2001 ◽  
Vol 38 (01) ◽  
pp. 26-30
Author(s):  
Thomas C. Miller ◽  
George J. Paitl
Keyword(s):  
Death Rate ◽  
Damage Control ◽  
Coast Guard ◽  
Commercial Fishing ◽  
Fishing Vessel ◽  
Fishing Vessels ◽  
Vessel Damage ◽  
Damage Stability ◽  
Recent Initiative ◽  
The U.S

The U.S. Coast Guard has observed the death rate for commercial fishermen decline steadily during the years following the enactment of the Fishing Vessel Safety Act of 1988. This Act called for requirements of survival equipment and fire fighting equipment, among other items, targeted at minimizing the consequences of a vessel capsize, sinking, fire or other casualty that required the crew to abandon ship. In recent years, the death rate has plateaued with minimal to no decreases and even a slight increase in 1996. While of concern, this plateau seems logical because the primary focus over the last eight to ten years has been on reducing the consequences of commercial fishing casualties (response). However, fishing vessels continue to capsize or sink before crew members are able to access survival equipment and lives are being lost. In order to continue to decrease the industry death rate, regulators and those responsible for oversight of this industry must shift the focus from reducing the consequence of casualties (response) to decreasing the likelihood of casualties occurring (prevention). This paper details the most recent initiative the U.S. Coast Guard has undertaken in its Fishing Vessel Safety Program and describes the Fishing Vessel Training Suite developed to facilitate this industry-wide education. The Training Suite consists of three trainers and a document titled, "Best Practices Guide to Vessel Stability." The three trainers include:Interactive Stability Trainer,Small Vessel Damage Stability Trainer, andSmall Vessel Damage Control Trainer. The U.S. Coast Guard has received very positive feedback from the commercial fishing industry and lives have been saved as a result of the use of this Training Suite.

Commercial Fishing: Has Technology Made the Industry Safe...Enough?

2006 ◽  
Vol 40 (3) ◽  
pp. 32-39
Author(s):  
Kyra M. Dwyer ◽  
R.J. Burns
Keyword(s):  
Complex Nature ◽  
Commercial Fishing ◽  
Fishing Industry ◽  
Economic Factors ◽  
Safety Equipment ◽  
Fishing Vessel ◽  
Fishing Vessels ◽  
Shared Goal ◽  
Available Technology ◽  
Difficult Challenge

The Fishing Vessel Safety Act, signed into law on September 9, 1988, was the first comprehensive legislation to be enacted in this country with the goal of reducing industry fatality rates. Paramount in the new regulations were provisions for the mandatory carriage of safety equipment aboard all commercial fishing vessels, depending on the vessel's route, size, and build date. The introduction of this technology had a measurable impact on reducing both vessel losses and fatalities, but the downward trends seen within the first ten years of the Act's enactment have since leveled off and are holding steady at what remains unacceptably high rates in comparison to other industries. This article argues that human and economic factors are limiting the effectiveness of available technology and contributing to this statistical plateau. Specific examples of these factors are provided, and possible solutions examined in the context of fishing vessel casualties and safety enforcement. Additionally, this article examines the roles of industry members and regulators as they work towards the shared goal of realizing a safe commercial fishing industry. However, inherent in this goal is realizing when these objectives have been achieved—and, given the complex nature of fishing vessel casualties, this realization may be the most difficult challenge of all.

Stability of Fishing Vessels with Water on Deck: A Review

1982 ◽  
Vol 26 (02) ◽  
pp. 106-116
Author(s):  
Richard L. Storch ◽  
Ibrahim Çaglayan
Keyword(s):  
Fishing Vessel ◽  
Sea State ◽  
Hydrodynamic Analysis ◽  
Analysis Techniques ◽  
Water On Deck ◽  
Hydrodynamic Approach ◽  
Fishing Vessels ◽  
Logical Point ◽  
Static Approach ◽  
Vessel Stability

A thorough literature survey of research into the effect of water on deck on fishing vessel stability revealed that four predominant analysis techniques have been employed. The first, a static approach, is used to judge vessel stability by predicting the pseudo-static angle of heel, the heel angle about which the vessel rolls when water is trapped on deck. The second approach is a dynamic one in which the equation of motion in roll is written and the water on deck is treated as a roll-inducing moment. The third approach employs probabilistic analysis to determine the likelihood of having water on deck, usually presented as a function of freeboard and sea state. A hydrodynamic analysis, applied in the research of Dillingham, models the geometry of the water on deck as a function of time and inputs the resulting forces and moments as an exciting term in the roll motion equation, assuming linear motions. The hydrodynamic approach represents a significant advancement in understanding the phenomenon and is a logical point from which to initiate further research efforts.

scholarly journals In situ target-strength measurements of Chilean jack mackerel (Trachurus symmetricus murphyi) collected with a scientific echosounder installed on a fishing vessel

2008 ◽  
Vol 65 (4) ◽  
pp. 594-604 ◽  
Author(s):  
Hector Peña
Keyword(s):  
Target Strength ◽  
Commercial Fishing ◽  
Jack Mackerel ◽  
Fishing Vessel ◽  
Acoustic Backscattering ◽  
Acoustic Data ◽  
Fishing Vessels ◽  
Single Target ◽  
The Mean

Abstract Peña, H. 2008. In situ target-strength measurements of Chilean jack mackerel (Trachurus symmetricus murphyi) collected with a scientific echosounder installed on a fishing vessel. – ICES Journal of Marine Science 65: 594–604. The use of commercial fishing vessels for scientific purposes has increased worldwide in the past 10 years. Many such studies have involved the collection of acoustic data from both uncalibrated and calibrated echosounders. However, few studies have involved investigations of in situ target strength (TS). During August/September 2003, in situ TS data on Chilean jack mackerel (Trachurus symmetricus murphyi) were collected on board a commercial purse-seiner during normal fishing operations off Chile, using a 38 kHz, Simrad EK60 scientific echosounder. The single-target detections of Chilean jack mackerel were filtered by depth, off-axis beam angle, and beam-compensation criteria to improve the quality of the data used for the TS calculations. Two methods, using raw data and tracked data, were employed to calculate the mean acoustic-backscattering cross section (σbs) and mean TS of Chilean jack mackerel. The results of the two approaches gave similar results, with a strong mode in the mean TS distribution between −35 and −37 dB for fish lengths ranging from 26 to 34 cm, indicating a b20 value of −66 dB. These results agreed well with most results published for this species and others of the same genus (i.e. T. trachurus, Trachurus t. capensis, and T. japonicus).

scholarly journals Fisheries: A Missing Link in Greenhouse Gas Emission Policies in South Korea

2021 ◽  
Vol 13 (11) ◽  
pp. 5858
Author(s):  
Kyumin Kim ◽  
Do-Hoon Kim ◽  
Yeonghye Kim
Keyword(s):  
Greenhouse Gas ◽  
Greenhouse Gas Emission ◽  
Ghg Emissions ◽  
Bioeconomic Model ◽  
Negative Externalities ◽  
Fishing Vessel ◽  
Gas Emission ◽  
Fishing Vessels ◽  
The Government ◽  
Different Levels

Recent studies demonstrate that fisheries are massive contributors to global greenhouse gas (GHG) emissions. The average Korean fishing vessel is old, fuel-inefficient, and creates a large volume of emissions. Yet, there is little research on how to address the GHG emissions in Korean fisheries. This study estimated the change in GHG emissions and emission costs at different levels of fishing operations using a steady-state bioeconomic model based on the case of the Anchovy Tow Net Fishery (ATNF) and the Large Purse Seine Fishery (LPSF). We conclude that reducing the fishing efforts of the ATNF and LPSF by 37% and 8% respectively would not only eliminate negative externalities on the anchovy and mackerel stock respectively, but also mitigate emissions and emission costs in the fishing industry. To limit emissions, we propose that the Korean government reduce fishing efforts through a vessel-buyback program and set an annual catch limit. Alternatively, the government should provide loans for modernizing old fishing vessels or a subsidy for installing emission abatement equipment to reduce the excessive emissions from Korean fisheries.

An Approximate Method for Intact Stability of Fishing Vessels

1999 ◽  
Vol 36 (03) ◽  
pp. 171-174
Author(s):  
Hüseyin Yilmaz ◽  
Abdi Kükner
Keyword(s):  
Design Stage ◽  
Design Parameters ◽  
Preliminary Design ◽  
Ship Stability ◽  
Fishing Vessels ◽  
Initial Stability ◽  
Intact Stability ◽  
Preliminary Design Stage ◽  
Reduce Risk ◽  
Vessel Stability

It is well known that stability is the most important safety requirement for ships. One should have some information on ship stability at the preliminary design stage in order to reduce risk. Initial stability of ships is an important criterion and can be closely evaluated in terms of form parameters and vertical center of gravity. In this study, using some sample ship data, approximate formulations are derived by means of regression analysis for the calculations expressed in terms of ship preliminary design parameters that can easily provide approximate GM calculations. Thus designers can be provided with ship stability at the preliminary design stage, and also a set of appropriate design parameters for improving vessel stability can easily be determined.

scholarly journals PERBANDINGAN KAPAL MONOHULL, CATAMARAN, TRIMARAN BERDASARKAN TINJAUAN OPERASIONAL PENGGUNAAN BAHAN BAKAR

2021 ◽  
Vol 4 ◽  
pp. 30-36
Author(s):  
Jacobus Tupan ◽  
Richard Benny Luhulima
Keyword(s):  
Data Analysis ◽  
Energy Requirements ◽  
Energy Usage ◽  
Fishing Vessel ◽  
Fishing Vessels ◽  
Initial Stage ◽  
Transverse Stability ◽  
Fishing Fleets

In general, fishing fleets operating in Maluku waters and managed by local entrepreneurs consist of monohull and trimaran fishing vessels with outriggers. Monohull fishing vessels have limited deck space and poor transverse stability, while trimaran-type vessels have better deck space and transverse stability than monohull vessels, but because they are still in the form of outriggers, the space is limited. This study aims to examine the development of the trimaran fishing vessel in terms of energy requirements, safety, and comfort of the crew during fishing operations. The initial stage of this research begins with data analysis and the basic size of monohull fishing vessels operating in Maluku waters, from this data the shape of the trimaran hull is designed. Calculation of resistance using CFD, then analyzed the calculation of resistance and stability, safety, and comfort of the ship using Maxsurf. The drag Trimaran is 8.86% smaller than a monohull and 3.25% smaller than a catamaran. Energy Usage (EHP) is proven by trimaran ships more than other ship modes. The average trimaran period is 10.5 seconds which meets IMO standards and is declared operationally good.

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