بررسي پديده سرمازدگي در استان چهارمحال و بختياري از ديدگاه همديدي - ديناميكي

Investigation Reason Synoptic and Dynamic Frezzing and Chilling in Charmahal & Bakhtiary Province

Freezing and chilling have been known as the cause of losses and horror among farmers from ancient time. The important factor in freezing is apparently temperature but indeed fluctuation of other meteorological parameters such as pressure, humidity, type of clouds and fog in the ground level and upper air all contribute to temperature and its fluctuation. In this research a case of chilling which occurred on may 6`h, 2000 in Chaharmahal and Bakhtiary province, was chosen and meteorological parameters before and after that were investigated and analyzed in terms of an hourly basis. The aim of this research was the recognition of effective dynamic and synoptic factors in chilling and freezing in order to prevent and mitigate this phenomenon. The results showed that heat dissipation on that day was 71 times more than normal conditions. So by applying this amount of heat to the atmosphere by different methods, it is possible to prevent this phenomenon. Sudden changes of pressure, humidity and other meteorological parameters are known as the cause of this phenomenon.Using non-resistant varieties can intensify the losses. The type of soil, irrigation and other farming elements have an important role in this phenomenon.