Rainfall-induced hydraulic scouring induced by rainfall is a significant factor contributing to slope instability and failure. To elucidate the impact mechanisms of various geosynthetic reinforcement methods on the hydraulic stability of slopes

laboratory slope hydraulic scour model tests were conducted. Comparative studies were performed on four slope configurations: unreinforced (J1)

geotextile reinforced (J2)

geotextile and geogrid composite reinforced (J3)

and geotextile and geocell composite reinforced (J4). The results indicate that reinforcement materials improve slope hydraulic response characteristics

reduce overall moisture content

and enhance slope stability and drainage performance. Geosynthetic reinforcement reduces both the rate of accumulation and the stabilized value of pore water pressure

significantly diminishing slope earth pressure

settlement

and soil loss. Among the variants

J4 demonstrated the most pronounced effect

followed by J3

while J2 showed relatively weaker performance. Composite reinforcement system enhances slope resistance to erosion

with J4 delivering optimal protective effect in hydraulic erosion tests. The findings offer a reference for selecting geosynthetic reinforcement methods and for studying the mechanisms of slope resistance to hydraulic erosion.