Investigating the Effects of Climate Change on Meteorological Drought Characteristics of Hablehrood Basin Using the HADCM3 General Circulation Model and the SPI and DI Index

Climate change is one of the most important challenges that affect different parts of human life. One of the most important consequences of climate change is the impact on water resources and the occurrence of droughts. In this research, the effects of climate change on the drought condition of Hablehrood watershed during the next three decades were evaluated using Decile Drought Index and Standardized Precipitation Index (SPI). Initially, the monthly data of the output of the HADCM3 General Circulation Model )GCM(, under the A2 scenario were Downscaled in the LARS-WG5 statistical model and the ability of this model to simulate the past climate (1995-1995 period) Firoozkooh synoptic stations basin Hablehrood watershed was approved. Then, climatic parameters of the minimum temperature, maximum temperature, precipitation and sunshine for the period 2040-2011 were simulated for the station studied. The results obtained from the station showed that the average annual maximum temperature would increase to 0.47 degrees Celsius, and the minimum temperatures would be 0.56 degrees Celsius. Annual precipitation fluctuations are not significantly different with rainfall during the base period, so that precipitation 0.06mm will be changed in the future period. Then, using rainfall data, the drought condition of the basin was studied using the two droughts Index mentioned in the annual scale. The results showed that these two Index are well-matched