A Study of the Effect of Change in Screen Height on the Various Thermal Indices in Different Environmental Conditions

摘要

In the present study, the role of change in screen height from 130 to 170 centimeters at Iranian Meteorological Stations on the thermal parameters was investigated. To this end, the necessity for carrying out a field study, a statistical survey and also a comparative study between a standard climatological station and a research station in forest conditions was felt. The results of this study indicated that change in 40-centimeter screen height has created a significant difference (at 1% level) during all the observation hours (06:30, 12:30 and 18:30) of local time in thermal indices at both stations. Also, the amount of the difference created in bulb temperature, wet bulb temperature, relative humidity, and maximum temperature has been greater in the standard climatological station, and the minimum temperature in it has been less than the forest station. The greatest effect of change in screen height on bulb temperature at climatological station was 1.61 degrees centigrade and at forest station 1.28 degrees centigrade. The greatest difference created in bulb temperature was observed at 06:30, and the least difference was observed at 12:30 (Local Time).