Monitoring and Spatial Analysis of Drought Severity 2000-2001Crop Year in Fars Province Using Standardized Precipitation Index in The Geographic Information Systems (GIS)
Subject Areas : Article frome a thesisنادر پیرمرادیان 1 , S.A SH 2 , M.A SH 3
1 - استادیار گروه مهندسی آب
2 - دانشجوی دکترای آبیاری و زهکشی
3 - استادیار پژوهشی
Keywords:
Abstract :
Drought is one of the most common natural events that has a great negative impact on agriculture and water resources. Due to the undesired effects of drought, various sections like production, economical, social and ecosystems encounter serious problems. Among the characteristics of a drought, i.e. severity, duration and local prevalence are more important. In order to minimize the damages of drought, it is obvious that the transmission of crisis management into the risk management is unavoidable. Therefore, assessment and mitigation of droughts effects are supervising and necessary. This requires, evaluation and statistical analyzes of the drought indices in each area. The standardized precipitation index was selected for present study due to the advantages of this method for regional analysis and time relationship establishment between drought incidents in different parts of a region. The precipitation data collected at 125 stations in the Fars and neighboring for a 30 year period provinces were used for this analysis. The standardized precipitation index were computed for the time scales of 6, 12 and 24 months in order to determine the monthly drought severity, for all of the station during the 2000-2001 crop year. Using the ArcGIS9 software, The mapping and spatial analysis were accomplished. The results indicate that the two variables of severity and local prevalence increase commensurate prolongation and continuation with. Moreover, the results of this study indicated that parts of northeast, southeast, south and southwest of Fars province are more vulnerable and more exposed to drought than the other parts. As the cash earning potential of the about-motional areas is based on dry land farming and traditional agriculture, therefore, the very survival of their inhabitants hinges on receiving an adequate and timely precipitation.