(8)
Where \(\overset{\overline{}}{Y_{i}}\) is the average elevation within
the neighborhood of the i-th point on the bottom line of the runoff
path, \(\overset{\overline{}}{Y_{\text{imin}}}\) is the minimum
elevation of the i-th point on the bottom line of the runoff path, and m
is the point on the bottom line of all runoff paths in the runoff plot.
2.3.3. Determination of runoff characteristics
Surface runoff coefficient was used to reflect the surface runoff
characteristics of each runoff plot. When studying the coupling effects
of the spatial distribution of cypress and topography on surface runoff
coefficient, it was necessary to eliminate the interference of extreme
rainfall events on surface runoff coefficient. Therefore, the rainfall
intensity with the most frequent occurrence in this area was taken as
the standard, and 10 groups of runoff and precipitation data with
similar rainfall intensity were selected to calculate the surface runoff
coefficient: