In this study, a real-scale experiment was carried out in a natural gully to examine the effectiveness of hybrid countermeasures consisting of cylindrical baffle arrays and a flexible barrier. The dynamic flow behavior, including barrier impact forces and gully erosion, was monitored using visual recording tools (digital camcorders and high-speed cameras), remote sensing (UAV-LiDAR), and physical sensors (load cells). Results showed that the baffle arrays decreased the frontal velocity by 51%, which is substantially lower than that observed for barriers without upstream baffles. The normalized impact force on the terminal flexible barrier was reduced to a value below the theoretical boundary of α /k=0.5. Through the topographic analysis, the hybrid barrier system effectively reduced channel bed erosion and promoted deposition. Finally, the field-scale data suggest that up stream baffles in front of a barrier decrease debris flow energy and offer a more effective protective system than a single barrier.