Assessment and analysis of flood-waterlogging disaster condition in Dongting lake region

This paper assesses and analyses disaster degree of flood -waterlogging disaster by use of three-factor influence assessment method. It establishes the synthetic disaster index model and analyzes the influence degree of different disaster factors on synthetic disaster condition by use of the method of continuous substitution. The study results show as follows. The variation of disaster degree has the features of quasi-period and of development by stages; the factors of flood disaster condition are the main influence factors on variation of synthetic disaster condition, the influence direction of different factors are not all the same, and the factors that enlarge disaster condition show the new characteristics of flood-waterlogging disaster, because the waterlogging disaster is serious day by day, the control of waterlogging must be strength- ened.