(2)
where EIIw represents the ecological importance index of the space
maintaining water security,s1 is the index of the distance to a river or lake,s2 is the index of the type of flood conditioning storage areas,s3 is the index of the type of water source protection areas,
and s4 is the index of the importance for water storage. Using Eq.(2), we calculated the ecological importance index of the space maintaining water security for each grid using software
ArcGIS9.3. Finally, using the raking standards in Table 1,we obtained the spatial grade map of water security importance.
(2)where EIIw represents the ecological importance index of the spacemaintaining water security,s1 is the index of the distance to a river or lake,s2 is the index of the type of flood conditioning storage areas,s3 is the index of the type of water source protection areas,and s4 is the index of the importance for water storage. Using Eq.(2), we calculated the ecological importance index of the space maintaining water security for each grid using softwareArcGIS9.3. Finally, using the raking standards in Table 1,we obtained the spatial grade map of water security importance.
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