The Guanshan gully can be defined as a typical potential debris flow gully through the interpretation of remote sensing image before the earthquake and aerial image after the earthquake.

This paper mainly discussed and assessed the hazard levels of debris flow valleys based on the data of field investigation and high-resolution remote sense image identification.

This paper,in light of the system science and geomorphology,uses geomorphic information entropy which can be used to indict the characteristics of evolution of landforms to study debris flow gully and make risk assessment of debris flow gully.