List of Articles خشکسالی

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  1 - Modeling the correlation between drought, number of rainy days and evapotranspiration in Fars province
  maryam khosravian alireza entezari Mohammad baaghide rahman zandi
  10.29252/.5.7.1
  Drought is one of the recurring phenomena in all parts of the world with high-rainfall and low-rainfall climates and it is consider as a natural disaster. Iran is also one of the countries which involved in this phenomenon in different places. Its characteristics, such More

  Drought is one of the recurring phenomena in all parts of the world with high-rainfall and low-rainfall climates and it is consider as a natural disaster. Iran is also one of the countries which involved in this phenomenon in different places. Its characteristics, such as the severity, duration, and extent of the drought, are vary from place to place and its damages is depending on the country's planning. In this regard, the necessity of knowing the correct weather conditions and climatic characteristics of different regions have become clear to planners through environmental, economic, agricultural and industrial potentials and their optimal use, as well as predicting the occurrence of natural disasters such as floods and droughts. In this study, for evaluating and comparing drought and wetness events, the precipitation data for the period (1987-2017), as well as the evaporation and transpiration data and the number of rainy days during a statistical period of 10 years (2008-2017) were obtained from 9 stations in Fars province. The standardized precipitation index (SPI) was used, and the Arc GIS software, the drought zoning, evaporation and transpiration maps, and the number of rainy days in the province were plotted. In the studied years, Fars province has faced a near-normal state for 24 years in and drought for 5 years and wetness for one year. The drought situation was studied and analyzed in Shiraz city in the continuation. According to the obtained results, the drought in Shiraz city is more severe than the other parts of the province and it will continue in the future. The SPI index has the highest correlation with the parameters of the number of rainy days with a rate of (0.46) and evaporation and transpiration with a rate of (0.26) in 2012 and 2008. Manuscript profile
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  2 - Analysis and comparing several climate droughts indicators and determine the best index in southeast of Iran
  zahra hejazizadeh farshad pazhoh haniyeh shakiba
  the drought is the most destructive weather events which cause significant causes both in natural resources sector and human’s life. The aim of this research is to compare the performance of drought’s indexes and determining the best index in the region of southeast of More

  the drought is the most destructive weather events which cause significant causes both in natural resources sector and human’s life. The aim of this research is to compare the performance of drought’s indexes and determining the best index in the region of southeast of Iran. To this purpose with using 30 year of daily precipitation data (1985-2014) from meteorological organization and with using 8 most widely used indexes such as standard precipitation, rainfall anomalies, percent of normal, annual precipitation, Niche, the standard score, deciles and Chinese Z in 19 meteorological stations of Kerman, Hormozgan and Sistan va baloochestan the accuracy of each indicators examined in determining the drought intensity. Also the zoning has done in arc GIS9.3 for the driest year in the statistical time period and comparing the most severe drought category in 2 selected index. The accuracy of each index analyzed in 2 annual and monthly scales. In annual scale is used the efficient measures of minimum precipitation’s symmetry years with most severe droughts in region’s stations. The results showed that in the monthly scale in order to analyze the southeast drought of the country the dynamic index of standard precipitation (SPI) in a time period of 6 and 12 month had the best function. But in annual scale the rainfalls anomalies indexes (RAI) and Docile (DI) in all the stations had showed the minimum precipitation amounts with severe droughts which determined as the best index. Also the Niche index had the weakest function in determining the drought intensity in southeast of Iran’s stations. Manuscript profile
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  3 - Exploring and anticipation of famine during pasture covering growth periodCase study: Ghouri chay aquiferous zone (Pars abad Moghan city)
  saeide eini meysam toulabi nejad  
  In order to famine exploring; temperature mean and daily data values , total of Pars abad station precipitation during 196-2016 statistical period for implementation of SPI Index were used in 1,3 and 6 months intervals and also TM Landset satellite images was applied fo More

  In order to famine exploring; temperature mean and daily data values , total of Pars abad station precipitation during 196-2016 statistical period for implementation of SPI Index were used in 1,3 and 6 months intervals and also TM Landset satellite images was applied for NDVI famine investigation. In anticipation part, CanESM2 was applied under RCP4.5 diffusion scenario in 5th series and also anticipating variables such as NCEP-NCAR 1961-2005 were applied. According to famine indices implementation (SPI and NDVI), temperature values anticipation and Pars abad station precipitation (CanESM2 model under RCP4.5 scenario), it was recognized that pasture growth situation in current conditions during flowering and seeding stages in some of main species of Ghouri chay aquiferous zone were improper. Mentioned main case was obtained through Pars abad Moghan station Ambrotermic curve and 1 month SPI famine index during 1375-1395 statistical periods, but, at the basis of anticipation temperature and precipitation values by using CanESM2 Model with 5th series model reports ; mentioned conditions will be drier during 1385-1477 and also pasture covering growth period will be reduced 6 months to 3 months. This case needs to management plans and aqueferous implementation in studied region as a natural reservoirs according to pasture high importance. Manuscript profile
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  4 - Migration crisis caused by short-term droughts in Sistan and Baluchestan Province
     
  Drought is a complex phenomenon that is the definition of it is difficult. Definitions, it is presented in different areas and each of them has different definitions depending on the amount of average rainfall. Since the beginning of the formation of human civilization More

  Drought is a complex phenomenon that is the definition of it is difficult. Definitions, it is presented in different areas and each of them has different definitions depending on the amount of average rainfall. Since the beginning of the formation of human civilization so far, the drought has always been considered one of the natural disasters and catastrophic impact human activities have on. This paper describes a method of analysis to assess the drought and its relationship with the inhabitants of Sistan and Baluchestan Province migration. To understand the different effects on rainfall, water resources, leading to the return of the SPI to be used to evaluate the drought in Sistan-Baluchistan province. Data monthly precipitation (mm), the years 2005 to 1985 for four stations in Sistan and Baluchestan (Zahedan, Zabol Iranshahr, Chharbhar, Konarak) were studied. Results indicate that water shortages in drought affected areas are the result of increased immigration flora. The occurrence of severe in the region, has left the economic and social adverse effects due to the economy's heavy reliance on agriculture people in Sistan and Baluchestan this crisis has led to the phenomenon of origin and demographic balance, the economic, social and ... unbalanced and lead to regional and underdevelopment of the region. Manuscript profile
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  5 - Evaluation of trend of rainfall and temperature changes and their effects on meteorological drought in Kermanshah province
  Maryam Teymouri Yeganeh Liela Teymouri Yeganeh
  Climate change is one of the natural features of the atmospheric cycle, which results in anomalies or fluctuations in the process of meteorological parameters such as rainfall and temperature. Also, drought is one of the weather and climate disasters, including catastro More

  Climate change is one of the natural features of the atmospheric cycle, which results in anomalies or fluctuations in the process of meteorological parameters such as rainfall and temperature. Also, drought is one of the weather and climate disasters, including catastrophic events. It alternates with floods and causes significant damage each year. Lack of rainfall has different effects on groundwater, soil moisture and river flow. For this reason, the study of changes in precipitation and temperature has always been the focus of researchers in various sciences, including natural resources and the environment. In this study, using the data of Kermanshah Meteorological Organization related to 30 years of rainfall, average minimum temperature and average maximum temperature in three stations of Kermanshah, Islamabad West and Sarpol-e Zahab to assess the severity of drought each year by DIC software Using standard precipitation index (SPI) and examining the trend of temperature changes using two non-parametric Mann-Kendall tests, Sensitimator and also linear regression. In order to study the drought trend during the 30-year period, statistical software was used and the results showed that during the 30-year period, all three stations are in near normal condition. Also, the results of temperature changes using the mentioned tests indicate the increasing trend of temperature and this trend is significant at the level of 99% using two non-parametric Mann-Kendall tests. Manuscript profile
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  6 - Comparison of the effects of pollution caused by Saravan wastes on Kacha River during drought and wet year
  مینا جعفری هانیه میربلوکی fatemeh ghanbari
  Waste landfills change over time due to exposure to physical and biological factors, these changes include the production of leachate and its penetration into the subsoil, groundwater pollution, production and emission of gases from waste decomposition, and finally the More

  Waste landfills change over time due to exposure to physical and biological factors, these changes include the production of leachate and its penetration into the subsoil, groundwater pollution, production and emission of gases from waste decomposition, and finally the settlement in the site. The leachate produced flows in different layers of waste and carries toxic and polluted substances to surface or groundwater. Kacha River, which carries the contamination load from Saravan landfill, flows into Siahrud River; Siahroud passes through this lands on its way, flows to the north and after joining Goharroud, enters the eastern part of Anzali Wetland. In this study, sampling stations were located in Saravan landfill and Kacha River and sampling was done in winter and summer and COD, BOD, TDS, pH, EC, ammonia, phosphate and nitrate parameters were measured. Comparison of the results of leachate analysis of Saravan landfill and Kacha River in summer and winter showed that all parameters, including BOD and COD parameters, which are indicators of contamination load in the Kacha River, increased in the drought season (summer) compared to the wet season (winter) Which indicates the amount of more pollution from Saravan landfill to Kacha River and from there to Gohar River and finally Anzali wetland. Manuscript profile