Drainage basin sediment connectivity evaluation method considering road influence

The invention belongs to the technical field of ecological hydrology, and discloses a drainage basin sediment connectivity evaluation method considering road influence, which comprises the following steps: improving the calculation of a connectivity index IC, namely, taking a relative smoothness index RS capable of better reflecting the sediment connectivity of a mountain forest region as a weight factor in the calculation process, and meanwhile, calculating the connectivity index IC; a road serves as a mask layer to participate in an IC calculation process, so that generation of a river network mask layer under the influence of a road network is considered, the influence of a road network on the surface runoff direction, change of the length of a confluence path and the like are reflected, and the defect that the road serves as a drainage channel to influence sediment connectivity is overcome; the method is suitable for mountain forest areas affected by roads. According to the method, the defect that the roa