Measurement and Determination of Light Pollution: Case Study of Malatya City

Authors : Abdulvahap YILMAZ, Tuncay ÖZDEMİR

Pages : 38-43

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Publication Date : 2021-06-30

Article Type : Research Paper

Abstract :In this study, measurements of light pollution in and around Malatya city center were carried out by means of parcelization and mapping method with SQM insert ignore into journalissuearticles values(Sky quality meter); device. Measurements were carried out in the east, west, north and south directions at 5$^\circ$ intervals between the zenith and horizon in 7 regions in order to determine the effect of angle dependence in 84 points at the zenith references. Measurements which are taken in the lowest insert ignore into journalissuearticles values(bright); and highest insert ignore into journalissuearticles values(dark); regions measured are 16.53 mag arcsec$^{-2}$ and 20.68 mag arcsec$^{-2}$, respectively insert ignore into journalissuearticles values(Puschnig et~al.);. Accepting the atmosphere permeability as 73%, the total amount of light lost insert ignore into journalissuearticles values(escaping into space and scattered back from the atmosphere); was calculated as $\sim3.44\times 10^7$ lm. The angle dependence effect participated in the calculations and the luminous flux emitted towards the upper half space originating from the unnecessary use of artificial light was calculated as $4~540~973$ lm. This value was calculated as 0.56 Mlm h insert ignore into journalissuearticles values(megalumen-hour); per year. In the city, street lighting, billboards, lighting on the exteriors of the buildings are considered to be active for approximately 12 hours a day and the amount spent was calculated as 441.720 kWh per month. This calculated value corresponds to 26.99% of the approximate monthly electricity amount insert ignore into journalissuearticles values(1 636 064.2 kWh per month); causing light pollution.
Keywords : light pollution, SQM Sky quality meter, Calculation of wasted energy amount