Spatial and Temporal Variability Analysis in Rainfall Using Standardized Precipitation Index for the Fuhe Basin, China - Intelligent Computing for Sustainable Energy and Environment - page 456

Fig. 5. The average monthly rainfall of the 17 hydrometric stations in the Fuhe basin
Fig. 6. Drought monthly frequency changes by using the SPI-10 days smoothing sliding
analysis for the years 1970-2008 based on the average rainfall in the Fu river basin
Fig. 7. The average daily rainfall statistics in the 17 hydrometric stations of the Fu
basin
In order to capture the rainfall change trends and regularity, the absolute and
relative change trends of the rainfall using the SPI-10 days are examined and
the details are shown in Fig. 6 where the definitions of normal, drought and
flood are the same as that in Fig. 4. One can observe that flood and drought
signs have appeared in each month in the Fuhe basin and the natural disasters
have never stopped, and there are less abnormal events that occurred in the
month of October, and the normal frequency is nearly 0.8. From October to
December, there was a significant decrease in the relative frequency of dryness as