فهرست مطالب navid ziaee

The effects of a change in the temperature and particularly precipitation around the world are not well known due to their complexity and spatial variations. In this research, the impacts of climate change on some climatic variables (temperature and precipitation) has been studied  in Hableh Roud Basin due to ecological sensitivity and special situation of this area and HadCM3 model data were analyzed using LARS-WG model according to A2, B2 and A1B scenarios. The seasonal variations of precipitation, minimum and maximum temperature of the synoptic stations of Firouzkooh and Garmsar were investigated in two periods of 2030-2011 and 2046-2065. Results showed that precipitation between 0.23 to 0.48 mm will increase in the near future and will decrease between 0.08 to 0.15 mm in the middle future. The minimum temperature will increase between 0.5 to 0.67° C in near future and between 1.54 to 1.97° C for the middle future. Maximum temperature will increase in near future between 0.43 to 0.6° C and between 1.47 to 1.89° C in middle future. Finally, the climatic conditions of the Hableh Roud Basin will have a significant difference compared to current conditions in upcoming periods. Therefore, regarding to this issue, as well as awareness of the direct and indirect negative effects of climate change in the various parts of the basin (agriculture, water resources, environment, natural resources, health, industry and economics), long-term planning and strategic management of new situations is essential.

Climate change and drought have negative consequences, including the spread of deserts. In this research, the impact of climate change on some climatic variables (temperature and precipitation) of Firoozkooh and Garmsar synoptic stations in the period 2030-2011 and 2065-2046 using LARS-WG model under scenario A2, B2 and A1B and finally desertification hazard and risk using ESAs model in Hablehroud basin due to ecological sensitivity of this area were assessed. The results revealed that the precipitation in the near future will increase from 0.23 to 4.80 mm and in the middle future will decrease from 0.80 to 0.15 mm. The minimum and maximum temperatures will increase for both future periods. Most changes in desertification classes in the near future are related to scenario B1 and scenario A1B in the middle future, in which we can consider transition and change of hazard classes (F2, F3 and C1) to the critical classes (C3 and C4). In both future periods, the percentage of the risk classes area of IV and V (critical) will increase. Therefore, this increase for the middle future will be from 15.49% for scenario B1 and class IV up to 77.50% for scenario A2 and class V.