بررسی و پایش خشکسالی اقلیمی استان یزد با استفاده از شاخص SPI

Drought can occur in any climate regime and represents a deviation from average or normal conditions. The phenomenon of drought generally affects all human activities, including economic affairs, agriculture, natural resources, industry, social affairs, migration, service matters, cultural anomalies, tourism. One of the valid indices for the purpose of quantifying drought and drought monitoring is the standardized precipitation index (SPI). Rainfall is the only effective factor in the calculation of this precipitation index. According to the objectives of the research, the precipitation data of 65 synoptic and rain gauge stations in the study area and neighboring stations during the common statistical period of thirty-four years (1365-99) ) was investigated and analyzed, and finally according to the geographic coordinates of the mentioned rain gauge stations, the zoning of the values related to the annual SPI index related to the mentioned statistical period, at the level of the study area, using the Geographical Information System (GIS). The results of the zoning maps of the SPI index in different years show that the SPI index in Yazd province is generally within the normal range (between +1 and -1). The places have been affected by drought, which was the most severe drought in 2016-87.