Debris flow hazard and analysis of its geological environmental factors of Guanjiagoa drainage area in Wen County,Gansu Province

In this paper, the relationship between geological environment and debris flow activity in Guanjiagou gully of branch of Bailong jiang River. Bailong jiang River basin is one of the most serious area of debris flow activities in China, and Guanjiagou debris flow possesses typical characteristics. Based on comprehensive analysis of geology, geography and ecological environment, the mutual relation between debris flow activities and Quaternary geology is discussed. The formationa conditions of debris flow and general law of debris flow development are systematically expounded.