Figure 8 Correlation of
parameter α of TFDC, SFDC and FFDC of 224 catchments with
catchment physical characteristics BFI ,P max* α p.
As shown in Figure 8 (c), α of FFDC is closely related
to the multiplication of maximum daily precipitationPmax and αp . Due to
precipitation being a prerequisite for fast flow andPmax basically representing the maximum intensity
of daily precipitation. For specific catchments, the maximum fast flow
usually occurs when the maximum daily precipitation events happen.
Moreover, the probability of exceedance of the fast flow depends on the
occurrence of precipitation, as a supplementary condition. Therefore,Pmax*αp is selected as the
climatic influencing factors for the shape of FFDC with the Spearman’s
rank correlation coefficient of -0.4139. the shape parameters αof FFDC tends to decrease asPmax*αp increases. Based on this,
the results of Pmax*αp can be
used to predict the spatial variation of FFDC.