Risk Assessment of Debris Flow at Loquat Gully in Anxian County Based on Rough Set-Improved AHP
Min Liu · Subgrade Engineering · 2014
There are many factors affecting risk of debris flow with different degrees of such influence,thus it is difficult to accurately describe this risk and carry out correct quantitative analysis. Taking the Loquat Gully in Anxian County as an example,with comprehensive weighing based on rough set-improved AHP and fuzzy mathematics theory,qualitative and quantitative evaluation were conducted in relation to risk of debris flow. Ten indices,including maximum amount,drainage area,main gully length,gradient of both sides,bending coefficient,drainage relative relief,maximum daily rainfall,vegetation coverage,population density,loose solid material reserves,were selected as the factors for evaluation. The evaluation result shows that the debris flow at Loquat Gully is of mild hazard. This evaluation method has practical significance against monitoring and controlling of debris flow.