مقایسه و ارزیابی شاخص های خشکسالی DSI و لنکستر در پایش گرد و غبار و ماسه های روان در استان تهران

According to the objectives of the research, the data related to climatic factors affecting the dust phenomenon (temperature, humidity, precipitation, evaporation, wind, number of dust days) were collected, reconstructed, extended and completed in the form of drought indicators DSI and Lancaster were investigated and analyzed at Mehrabad Meteorological Station in Tehran in a statistical period of 30 years (1369 to 1398). The important result is that in Mehrabad station, the dust storm drought index (DSI index) in the years 1371, 1375, 1378, 1379, 1380, 1381, 1384, 1389, 1390, 1391, 1392 was almost high and showed above the number one. gives, the noteworthy point is that in most of the mentioned years, the temperature and evaporation values are high and the precipitation and humidity values are relatively low, which shows the direct relationship between the dust storm index (DSI index) and meteorological factors and data in the station. Mehrabad was in Tehran. Also, in the years 1369, 1374, 1376, 1378, 1379, 1380, 1381, 1387, 1388, 1389, 1391, 1392, 1393, 1394, 1395, the mobility index of sand dunes (Lancaster index) is also almost high and above the number. 50, the noteworthy point is that in most of the mentioned years, the temperature and evaporation values are high and the precipitation and humidity values are relatively low, which shows the direct relationship between the mobility index of sand dunes (Lancaster index) and Meteorological factors and data were at Mehrabad station in Tehran.