3.3 Relative contributions of driving forces to urban flooding
The marginal effects of the six most important driving forces are shown
in Fig. 5. With urban flooding
density, the landscape shape index is complex, with a positive
correlation ranging from 2.5 to 2.8 and a negative correlation ranging
from 2.8 to 3.1. The slope shows a stepwise positive correlation with
urban flooding density. As the green space ratio increased from 20% to
28%, the urban flooding density decreased from 0.010 to 0.005. The
urban flooding density varies from 0 to 0.005 when the building
congestion degree increases from 0.02 to 0.03. Building density
experiences an initial increase and then stabilizes and finally drops.