Time lag Analysis between climateTime And Lag Correlation Analysis Between Climate Drought And Hydrological Drought In Hashtgerd Plain

The aim of this research, study of effects climatic drought on hydrological drought in Hashtgerd plain. In this study, the SPI (standardized precipitation index) for climatic drought and GRI for hydrological drought was calculated. The Mann-Kendall trend test were used to assess data (rainfall and water level). Pearson correlation calculated through the cross-correlation between SPI and GRI. For detailed study of the correlation, the SPI time scales were calculated from 0 to 200 months and the lag time from 0 to 150. The results showed high correlation relate to interaction between the SPI and the lag time with the GRI. Also, the behavior patterns of piezometers caused three groups of time actions in study area.