Response Characteristics of Hydrological Droughts to Climatic Droughts in Nanpan River Basin
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Abstract:
The monthly streamflow data at 3 stations and monthly precipitation data at 20 stations of 40 years (1970 to 2009) in the Nanpan River Basin were selected to calculate the standardized streamflow index (SSFI) and standardized precipitation index (SPI) of different time scales (3,6,9,12,24 months). The SSFI for the hydrological drought samples from the computing results and SPI of the same period were selected to perform statistical analysis and then to investigate the response of hydrological droughts to climatic droughts. The results showed that (1) SSFI has good response to the SPI in the Nanpan River Basin; (2) the correlation between SSFI and SPI varies with time scale; and (3) the response time of hydrological droughts to climatic droughts is about 6 months in general.
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