Veysel Arli - Articles and news items

Noise reduction measures on Istanbul urban rail systems

Issue 4 2008, Past issues  •  18 August 2008  •  Veysel Arli, Track Facilities Manager, Istanbul Ulasim and Zübeyde Öztürk, Civil Engineer, Istanbul Ulasim

Noise is unwanted sound and is among the most pervasive pollutants today. The problem with noise is not only that it is unwanted, but also that it negatively affects human health and well-being. Problems related to noise include hearing loss, stress, high blood pressure, sleep loss, distraction, productivity loss and a general reduction in the quality of life and opportunities for tranquility.

Sound is a pressure fluctuation in the air; the magnitude of the sound describes the physical sound in the air. The response of human beings to sound depends strongly on the frequency of sound. In general, people are less sensitive to sounds of low frequency, such as 100 Hz (Hertz) than to sounds at 1000 Hz; also at high frequencies such as 8000 Hz, sensitivity decreases.

An important tram line rehabilitation project in Istanbul

Issue 4 2008, Past issues  •  18 August 2008  •  Veysel Arli, Track & Fixed Facilities Manager and Mustafa Polat, Tram Maintenance Chief, Istanbul Transportation Co.

The tram line which passes through Old Istanbul to the Eminönü coast and to Galata Bridge to Kabatas Wharf in the Historical Peninsula is an important railroad. The tram line was constructed stage-by-stage between 1992 and 1996.

Transportation demand in Istanbul is continuously increasing day-by-day and there are currently 385 trips each day (between 06:00a.m. and 00:00a.m.) with a 2.5 minute headway in peak hours. The tram line used to serve 190,000 passengers per day on a 14km track with 55 vehicles. It was awarded ‘Best Practice’ in providing high transportation demand by the International Association of Public Transport (UITP) in 2005, and now the daily number of passengers has risen to 250,000 according to 2007 figures.