(6)
Where S1 is the surface area of the runoff plot,
S2is
the projected area of the runoff plot.
Runoff path referred to the
shallow
trench formed by surface runoff, while the runoff path density was the
total length of the runoff path per unit area. In this study, RTK-GPS
was used to measure the runoff path, and hydrological analysis tool in
ArcGIS was used for secondary inspection: