Characters of distributions and reasons analysis of ill geological phenomena in the Toutunhe River basin

In this study,the characters of distributions of ill geological phenomena in the Toutunhe River basin were analyzed,based on the spot investigation and observed data analyzed.The results showed that ill geological phenomenon in the Toutunhe River basin mainly occurred in the middle reach of the river,the time distribution were controlled by the conditions of rainfall.The ill geological phenomenon were influenced by many natural factors,such as geology,landform,material composition,seismic activity,hydrometeorology,plant and human activities.The development of ill geological phenomenon in the river basin provided a mass of material elements,so it is tried to give some advices to prevent the ill geological phenomena,based on the natural environment and the condition of distribution of the ill geological phenomena in the river basin.