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The Rise in Temperatures on Railway Station Platforms

1989; Association of Japanese Geographers; Volume: 62; Issue: 4 Linguagem: Inglês

10.4157/grj1984a.62.4_311

2185-1735

Yasushi Sakakibara,

Railway Engineering and Dynamics

Temperatures along the Tokyu Toyoko Railway Line between Shibuya and Yokohama recorded atevery 15-second intervals by a thermistor sensor placed between the doors on the side of the first car of a train traveling the 25km of the line. One of the features of the distributions was a rise in temperature during the train's stops at stations. To identify the cause of that phenomenon, the rises in temperature were compared for trains passing through and those stopping at the same stations. The data show that the rise in temperature for trains stopping is as twice large as for those passing through. In the case of moving trains, errors in reading the thermometer caused by time lag should betaken into account, calculated according to the following conditions: The temperature around the platform changed in steps as model distributions. A typical station on the Toyoko Railway Line was chosen as a model station, Velocity distribution was that at the head of a train passing through the model station. After the errors were accounted for, the temperature rise for slowing became the same as that for stopping. As the time lag of the thermistor is small under this condition, the rise in temperature at the time of the tram's stopping at the station may have other momentary causes like the heat created by brake friction. In reality the temperature is not judged to change in steps owing to the advection currents of air. The temperature measured by a moving thermistor is not that at the point of observation but a spatial moving average temperature. The data excluding those after the stopping of a train and those recorded in 14sec after the train starts are useful. If the time interval for routine observations is within 8sec or less, the heat islands created by around urban stations can be observed.