An improvement on a method for estimating number of collision candidates between ships

Kaneko, Fujio

doi:10.1201/b14915-5

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…Kaneko (2002) also developed a method for the case of a rectangular area. Kaneko (2013) developed a method for calculating 𝑁 𝐶𝐶 for ships approximated as rectangular, and where the intersection angle of two waterways is small. For these conditions, collision situations were divided into six cases, and a method was developed to characterise each case.…”

Section: E(x)mentioning

confidence: 99%

“…In Pedersen (1995), 𝑁 𝐶𝐶 is calculated using Equation (2.4) when the intersection angles are 0°and 180°. Until now, intersection angles outside the range of 10°to 170°have not been considered, except in the case of 0°and 180°, but the solution was obtained by the method described by Kaneko (2013). In this case, regions I and III in Figure 9 cannot be ignored.…”

Section: Proposed New Formulationmentioning

confidence: 99%

“…Although Pedersen's method has been used frequently until now, a rational method that can estimate 𝑁 𝑎 at intersection angles below 10°and over 170°has not yet been developed. Kaneko (2013) developed an accurate estimation method; however, it was so complicated that it requires simplification for practical application. Furthermore, although some simulations were conducted, the method was not statistically validated (Friis-Hansen, 2008;Lušić and Čorić, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…In this study, a valid method for estimating 𝑁 𝑎 below 10°and above 170°, in addition to the angles between 10°and 170°, was developed by improving the method introduced by Kaneko (2013). Furthermore, simulations and statistical validation were performed.…”

Section: Introductionmentioning

confidence: 99%

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A method for estimating the number of collision candidates in two waterways – for all intersection angles

Kaneko

2022

J. Navigation

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Estimating the collision frequency of ships (F) is important for assessing collision risk on waterways. To date, F has been estimated as the product of the number of collision candidates $({N_{a }})$ and the causation probability $({P_c})$ : $F = {N_{a}} \cdot {P_c}$ , where ${N_{a }}$ represents the number of collisions that occur when related ships continue on course with no intervention, and ${P_c}$ is the probability that collision avoidance fails. Fujii developed a general method and Pedersen formulated it to estimate ${N_{a }}$ in an intersectional area. Their method is generally called ‘the geometric method’ because collision candidates are estimated only from the geometric relationship between two ships. The method has been used in many projects to estimate F in waterways; however, its use should be limited to intersection angles ranging from 10° to 170°. This paper presents a method, statistically verified by computer simulation, that can be used at all intersection angles to overcome this limitation. Moreover, it demonstrates strong agreement with Pedersen's method at intersection angles of 10° to 170°.

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Section: E(x)mentioning

confidence: 99%

Section: Proposed New Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A method for estimating the number of collision candidates in two waterways – for all intersection angles

Kaneko

2022

J. Navigation

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“…The concept of a 'collision diameters' and 'ship domains' has been developed further by authors such as Pedersen (2010), Kaneko (2002Kaneko ( , 2013 and Montewka et al (2010bMontewka et al ( , 2011Montewka et al ( , 2012-who have derived their own equations to estimate the number of geometric collision candidates; the latter have developed a concept called 'Minimum Distance to Collision' (MDTC), which incorporates the physical properties of vessels, ship dynamics and even the traffic patterns in an area to assess the risk of ship-ship collisions . Equations that incorporate principles of ship domain, in combination with vessel traffic data, are also often used in tools like iWRAP (Friis-Hansen 2008).…”

Section: Geometric Probability Of Accidentsmentioning

confidence: 99%

A Theoretical Risk Management Framework for Vessels Operating Near Offshore Wind Farms

Mehdi

Schröder-Hinrichs

2016

Mare-Wint

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The design of an offshore wind farm (OWF) can have a major impact on the safety of maritime operations in the vicinity. Factors such as the number of turbines, turbine spacing, and tower design can all have an effect the probability and consequences of various maritime accidents. The current chapter describes the potential effects of offshore wind farms on maritime traffic-particularly in a safety, reliability and risk context. The chapter also reviews existing methods, models and frameworks that can be used to assess the risk to maritime operations. Lastly, the authors propose an improved theoretical risk management framework that addresses some present concerns. The Need for Maritime Risk Management Around Offshore Wind FarmsIn this first section, the status of the OWF industry and the need for maritime risk management around wind farms is described. Trends in the OWF IndustryOver the past few decades, there has been a sharp increase in the use of renewable energy-driven not only by a more mindful society, but also by strong policy instruments and decisions. One of the most popular renewable energy schemes is wind energy. As the demand for energy generation grows, an increasing number of wind turbines are being installed offshore. OWFs offer several advantages over their onshore equivalents. There is better wind resource, and the wind speeds are more consistent out at sea. Potentially, wind turbines can also be scaled up to much

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Calculation of the number of ship collision candidates using mesh-based estimation method for ship traffic data

2022

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Predicting and assessing the ship–ship collision possibility in waters are important for discussions on ship traffic safety. The geometric number of collision candidates is one of the most commonly used indexes for representing the frequency of multi-ship encounters that have potential collisions. It has often been estimated for ship traffic in a delimited area based on existing concepts. However, to discuss ship traffic safety in wide-congested waters where ships navigate along various courses and various ship encounters occur, a comprehensive understanding of potential collisions corresponding to all encounter characteristics, such as the encounter angle and location, is necessary. This paper proposes a method, called a “mesh-based estimation method,” to calculate the geometric number of collision candidates. It can deal with various encounter angles by introducing a computational mesh to comprehensively assess potential collisions in wide-congested waters. The validation of the method is conducted by applying it to simple ship traffic and comparing the calculated result with a result calculated based on a conventional approach. In addition, the method is applied to traffic data of AIS-equipped ships navigating in Tokyo Bay in Japan to show locations that have potential collisions based on the encounter angles.

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An improvement on a method for estimating number of collision candidates between ships

Cited by 4 publications

References 2 publications

A method for estimating the number of collision candidates in two waterways – for all intersection angles

A method for estimating the number of collision candidates in two waterways – for all intersection angles

A Theoretical Risk Management Framework for Vessels Operating Near Offshore Wind Farms

Calculation of the number of ship collision candidates using mesh-based estimation method for ship traffic data

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