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Hatakeyama N.,Safety Analysis Laboratory | Miyachi Y.,Safety Analysis Laboratory | Kurihara Y.,Meteorological Disaster Prevention Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2015

In cold snowy regions, the number of level crossing accidents in winter is higher than in other seasons, therefore weather conditions, such as snow showers, are considered to have a large influence on accident occurrence. Previous studies have assessed the safety of level crossings solely from equipment data with no consideration of weather conditions. The purpose of this study, therefore, is to develop a method for assessing level crossing safety which takes into account weather condition factors. The method was applied in a case study and its assessment precision was improved.

Aeaki K.,Meteorological Disaster Prevention Laboratory | Fukuhara T.,Meteorological Disaster Prevention Laboratory | Shimamura T.,Research and Development Promotion Division | Imai T.,Meteorological Disaster Prevention Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2011

The safety of railway line sections against strong winds can be improved by setting up anemometers in locations where wind speeds frequently exceed the critical wind speed of overturning. In order to ensure optimum location of the anemometers, wind speed values need to be estimated over an N-year return period along railway lines. This paper introduces a method to estimate over a given return period the values of the maximum instantaneous wind-velocity along railway lines at interval of 100m, by using two kinds of numerical simulation techniques (the meteorological model and the Computational Fluid Dynamics model) and a topographical factor analysis.

Araki K.,Meteorological Disaster Prevention Laboratory | Imai T.,Meteorological Disaster Prevention Laboratory | Tanemoto K.,Vehicle Aerodynamics Laboratory | Suzuki M.,Vehicle Aerodynamics Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2012

Anemometers for operation control are mostly installed close to railway structures. Railway structures might therefore influence anemometer wind velocity data readings. The authors investigated the influence on the wind velocity of the anemometer position around typical railway structures through wind-tunnel tests and field wind observations. In the case of single-track embankments with a height of 6.5m from the ground surface, the increase in wind velocity on the leeward side was greater than on the windward side of railway structures, for heights up to 4m above rail level, as the wind direction approaches a 90 degree angle to the longitudinal direction of the railway structure.

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