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Table 2

Example of performance assessment of IK based on sample isotropic and anisotropic variograms and elliptic-fitted anisotropic variogram at 20:00 pm during the 2008-04-19 rainstorm event

DistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogramDistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogram
BIAS RMSE 
DA 28.089 16.345 18.327 DA 48.423 25.197 26.179 
LN 1.247 −2.311 −0.373 LN 22.139 20.396 19.622 
GEV − 0.878 −3.358 −1.604 GEV 20.916 20.783 19.546 
Gumbel 0.657 −5.690 −4.380 Gumbel 20.973 22.321 21.116 
GPA 1.359 −2.810 −1.077 GPA 21.359 20.440 19.173 
PA 2.293 −4.925 −3.366 PA 21.626 21.639 20.226 
GLO − 0.909 −3.593 −1.922 GLO 20.048 21.035 19.740 
LO − 1.822 −6.177 −5.050 LO 21.664 22.787 21.753 
MAE AEIV 
DA 29.971 19.937 21.594 DA 0.584 0.856 0.595 
LN 10.282 9.712 10.140 LN 0.699 0.878 0.722 
GEV 9.910 9.338 9.644 GEV 0.708 0.841 0.721 
Gumbel 10.563 7.777 10.031 Gumbel 0.703 0.916 0.709 
GPA 9.773 9.773 9.393 GPA 0.717 0.925 0.721 
PA 10.057 9.768 9.421 PA 0.713 0.902 0.716 
GLO 10.041 8.486 9.703 GLO 0.710 0.855 0.718 
LO 10.931 7.728 10.452 LO 0.698 0.916 0.702 
DistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogramDistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogram
BIAS RMSE 
DA 28.089 16.345 18.327 DA 48.423 25.197 26.179 
LN 1.247 −2.311 −0.373 LN 22.139 20.396 19.622 
GEV − 0.878 −3.358 −1.604 GEV 20.916 20.783 19.546 
Gumbel 0.657 −5.690 −4.380 Gumbel 20.973 22.321 21.116 
GPA 1.359 −2.810 −1.077 GPA 21.359 20.440 19.173 
PA 2.293 −4.925 −3.366 PA 21.626 21.639 20.226 
GLO − 0.909 −3.593 −1.922 GLO 20.048 21.035 19.740 
LO − 1.822 −6.177 −5.050 LO 21.664 22.787 21.753 
MAE AEIV 
DA 29.971 19.937 21.594 DA 0.584 0.856 0.595 
LN 10.282 9.712 10.140 LN 0.699 0.878 0.722 
GEV 9.910 9.338 9.644 GEV 0.708 0.841 0.721 
Gumbel 10.563 7.777 10.031 Gumbel 0.703 0.916 0.709 
GPA 9.773 9.773 9.393 GPA 0.717 0.925 0.721 
PA 10.057 9.768 9.421 PA 0.713 0.902 0.716 
GLO 10.041 8.486 9.703 GLO 0.710 0.855 0.718 
LO 10.931 7.728 10.452 LO 0.698 0.916 0.702 
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