Time and Lag Correlation Analysis between Climate Drought and Hydrological Drought in Hashtgerd Plain

Document Type : Research Paper


1 Graduate Student, Watershed Management, University of Tehran

2 Assistant Professor, Faculty of Natural Resources, University of Tehran-Iran

3 Professor, Faculty of Natural Resources, University of Tehran-Iran


The aim followed in this research work was a study of effects the of temporal climatic drought on the hydrological drought, the study being carried out in Hashtgerd plain, karaj. Throughout the study the SPI (Standardized precipitation Index) for climatic drought and GRI for the hydrological drought were assessed. Mann-Kendall trend test was applied to assess data (rainfall and water level). Pearson correlation was determined through cross-correlation between SPI and GRI. For a detailed study of the correlation, the SPI time scales were calculated from 0 to 200 months and the monthly lag time from 0 to 150. The results indicated a high correlation related to interaction between SPI and the lag time with the GRI. Also, the behavior patterns of piezometers led to three groups of time actions within the study area.


Main Subjects

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