<p>Five representative debris morphologies were constructed from quantitative morphology descriptors to investigate how particle shape influences the movement and accumulation behavior of dry debris flow. To assess morphology-dependent responses, sliding and rolling tests were conducted on representative debris blocks, and the movement characteristics of different shapes were compared. The collapse behavior of granular columns, flume movement, and depositional patterns of debris with different morphologies were then analyzed using the sphere discontinuous deformation analysis (SDDA) method. In addition, a real topographic case reconstructed from unmanned aerial vehicle photogrammetry was used to examine the movement and deposition behavior of morphology-controlled debris under complex terrain conditions. The results show that debris morphology significantly affects the mobility, collision and rolling behavior, and final accumulation pattern of dry debris flow. Flat and elongate debris are more likely to promote local accumulation, whereas spherical debris exhibits higher mobility and enhances the runout potential of the debris mass. These findings demonstrate that debris morphology is an important controlling factor in dry debris-flow analysis and should be explicitly considered in hazard assessment and engineering scenario evaluation.</p>