Drainage zoning and analysis in Lorestan province using drought indices

Drainage zoning and analysis in Lorestan province using drought indices Mostafa Fallahi (PhD in Climate Change, Researcher in ACECR Lorestan Unit) Mohammad Reza Mansouri (Master of Urban Planning, Municipality of Kuhdasht) Rasul Ali Ghaderi (Expert of Islamic Iran History, Municipality of Kuhdasht) Hossein Salehi (PhD student in Watershed Management, Lorestan University) Abstract The present study aimed to zoning and analysis of droughts using drought indices in Lorestan province. The statistical period of 20 years (1987-2009) was considered as a common statistical period. Then, with the help of DIP software, the RAI, PNPI and SPI indices calculate the drought condition for the stations under study and then to map the drought severity from geostatistical methods of the specified reverse distance method, Local estimator method, general estimator and radial function method have been used in Arc GIS 5/10 software environment. Keywords: Drought, Zoning, Lorestan Abstract The present study aimed to zoning and analysis of droughts using drought indices in Lorestan province. The statistical period of 20 years (1987-2009) was considered as a common statistical period. Then, with the help of DIP software, the RAI, PNPI and SPI indices calculate the drought condition for the stations under study and then to map the drought severity from geostatistical methods of the specified reverse distance method, Local estimator method, general estimator and radial function method have been used in Arc GIS 5/10 software environment. Keywords: Drought, Zoning, Lorestan