PRELIMINARY RESEARCH ON GEOLOGICAL DISASTER CHAINS IN LOESS AREA

Due to the collapsibility, porous and water sensitivity of loess, geological disasters are widely distributed in loess area in northwest of China and show the characteristic of disaster chains. In this paper, several typical geological disasters in loess area are analyzed and the developmental states of geological disasters are concluded. Furthermore, the structures of two typical disaster chains are well described. In the geological disaster chains, the scale amplification is obvious, which is elaborated according to the 7.23 debris flow in Dagou gully in Tianshui City, Gansu Province. According to current research progress in geological disasters, three key issues are concluded and then the research ideas are given respectively. The research on risk assessment and chain scission about disaster chains should pay more attention to the future research. All and all, the preliminary research on geological disaster chains would be provide scientific reference to the future study.